ACS Catalysis 最新文献

筛选
英文 中文
Tuning the Spatial Distribution and Chemical Nature of Acid Sites in MCM-22 Zeolite by Atomically Dispersed Lanthanum Species for Alkylation of 2-Methylnaphthalene
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-23 DOI: 10.1021/acscatal.4c07304
Yaxing Li, Xiaoyu Li, Haotian Zhang, Jiayi He, Kaining Su, Tianxiang Chen, Ruolin Zhang, Hua Xu, Yuchao Wu, Weisheng Yang, Lichen Liu
{"title":"Tuning the Spatial Distribution and Chemical Nature of Acid Sites in MCM-22 Zeolite by Atomically Dispersed Lanthanum Species for Alkylation of 2-Methylnaphthalene","authors":"Yaxing Li, Xiaoyu Li, Haotian Zhang, Jiayi He, Kaining Su, Tianxiang Chen, Ruolin Zhang, Hua Xu, Yuchao Wu, Weisheng Yang, Lichen Liu","doi":"10.1021/acscatal.4c07304","DOIUrl":"https://doi.org/10.1021/acscatal.4c07304","url":null,"abstract":"Rare-earth-promoted zeolites have broad applications in the petrochemical industry because modifying zeolites with rare-earth elements can remarkably improve hydrothermal stability and tune the physicochemical properties of the acid sites, resulting in substantial promotion in catalytic selectivity and long-term stability. However, for a specific reaction, it remains a challenge to elaborate the coordination environment of rare-earth elements within the zeolite structure and establish the structure–reactivity of rare-earth-promoted zeolite catalysts. In this work, we have employed multiple spectroscopy and electron microscopy techniques to elucidate the spatial location and coordination environment of atomically dispersed La species in MCM-22 concertedly. In particular, we have attempted to clarify the variation of the chemical nature of the acid sites in MCM-22 zeolite in response to the introduction of La promotor. By appropriately controlling the spatial distribution and chemical nature of the acid sites, we have obtained a La-modified MCM-22 catalyst with high activity, selectivity, and long-term stability (>800 h) for alkylation of 2-methylnaphthalene with methanol for the production of 2,6-dimethyl-naphthalene under industrially relevant conditions.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"13 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimizing Oxygen Vacancies through p-Band Center Modulation of Oxygen in the Li2WO4/Mg6MnO8 Catalyst for Enhanced Oxidative Coupling of Methane: An Experimental and Theoretical Study
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-23 DOI: 10.1021/acscatal.4c06709
Rohan Singh Pal, Rubina Khatun, Jyotishman Kaishyop, Sachin Kumar Sharma, Swati Rana, Shivani Singh, Anil Chandra Kothari, Tuhin Suvra Khan, Shailendra Tripathi, Suman Sarkar, Rajaram Bal
{"title":"Optimizing Oxygen Vacancies through p-Band Center Modulation of Oxygen in the Li2WO4/Mg6MnO8 Catalyst for Enhanced Oxidative Coupling of Methane: An Experimental and Theoretical Study","authors":"Rohan Singh Pal, Rubina Khatun, Jyotishman Kaishyop, Sachin Kumar Sharma, Swati Rana, Shivani Singh, Anil Chandra Kothari, Tuhin Suvra Khan, Shailendra Tripathi, Suman Sarkar, Rajaram Bal","doi":"10.1021/acscatal.4c06709","DOIUrl":"https://doi.org/10.1021/acscatal.4c06709","url":null,"abstract":"Herein, we demonstrate a one-pot sol–gel-assisted procedure to prepare a defect-rich Li<sub>2</sub>WO<sub>4</sub>/Mg<sub>6</sub>MnO<sub>8</sub> catalyst having surface oxygen vacancies, which facilitates the adsorption of O<sub>2</sub> molecules to generate active oxygen species (O<sub>2</sub><sup>–</sup>, O<sub>2</sub><sup>2–</sup>) by incorporating Li and W into the Mg<sub>6</sub>MnO<sub>8</sub> lattice. These active oxygen species serve as primary active sites, selectively dissociating CH<sub>4</sub> into CH<sub>3</sub><sup>•</sup> and promoting CH<sub>3</sub><sup>•</sup> coupling into C<sub>2</sub>H<sub>6</sub>, while hindering excessive oxidation of CH<sub>3</sub><sup>•</sup> into CO<sub><i>x</i></sub>. Various analytical methods such as XPS, O<sub>2</sub>-TPD, EPR, CH<sub>4</sub>-TPSR, in situ DRIFTS, and in situ Raman spectroscopy studies demonstrated that surface reactive oxygen species are more active and selective than lattice oxygen toward the formation of C<sub>2</sub> products. The controlled addition of Li and W plays a crucial role in stabilizing surface Li species through the formation of Li–O–W bonds by forming the Li<sub>2</sub>WO<sub>4</sub> phase, ensuring stable catalyst performance up to 100 h. DOS analysis shows a positive shift in the p-band center, which effectively promotes the formation of oxygen vacancies. Analytical studies confirmed that surface active oxygen species are more active and selective than lattice oxygen in forming C<sub>2</sub> hydrocarbons. The Li<sub>2</sub>WO<sub>4</sub>/Mg<sub>6</sub>MnO<sub>8</sub> catalyst exhibited superior performance, achieving ∼82% C<sub>2</sub> selectivity and ∼25% C<sub>2</sub> yield at 700 °C. We found that the stable formation of active oxygen species (O<sub>2</sub><sup>–</sup>) and a high Mn<sup>4+</sup>/Mn<sup>3+</sup> ratio over the surface are the key factors for achieving high C<sub>2</sub> selectivity and yield during OCM. DFT results show that the concentration of oxygen defect sites is higher on the surface of the Li<sub>2</sub>WO<sub>4</sub>/Mg<sub>6</sub>MnO<sub>8</sub> catalyst, which synergistically binds Li<sub>2</sub>WO<sub>4</sub> and Mg<sub>6</sub>MnO<sub>8</sub>, in comparison with pure Mg<sub>6</sub>MnO<sub>8</sub> surfaces. Furthermore, DFT calculations also indicate that oxygen vacancies are energetically more favorable on the surface of the Li<sub>2</sub>WO<sub>4</sub>/Mg<sub>6</sub>MnO<sub>8</sub> catalyst rather than in its subsurface. In situ XRD and in situ Raman analysis demonstrated that Li<sub>2</sub>WO<sub>4</sub> undergoes a reversible phase change, transitioning into a molten state at higher temperatures, potentially forming Li<sub>2</sub>O<sub>2</sub> species that may serve as active centers during the reaction.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"48 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142873851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Promoted *OH Adsorption Facilitates C–C Bond Cleavage for Efficient Electrochemical Upcycling of Polyethylene Terephthalate
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-20 DOI: 10.1021/acscatal.4c05352
Jinyong Sun, Binkai Shi, Shuixing Dai, Lei Chu, Huanlei Wang, Minghua Huang
{"title":"Promoted *OH Adsorption Facilitates C–C Bond Cleavage for Efficient Electrochemical Upcycling of Polyethylene Terephthalate","authors":"Jinyong Sun, Binkai Shi, Shuixing Dai, Lei Chu, Huanlei Wang, Minghua Huang","doi":"10.1021/acscatal.4c05352","DOIUrl":"https://doi.org/10.1021/acscatal.4c05352","url":null,"abstract":"The electrochemical oxidation of ethylene glycol (EG) derived from polyethylene terephthalate (PET) plastic into value-added chemicals, coupled with hydrogen evolution, offers a promising approach to addressing plastic pollution. However, the mechanisms by which the adsorption of key reaction intermediates affects the EG oxidation reaction (EGOR) are not well understood. To investigate this, we synthesized two model catalysts: amorphous-phase CoNiOOH/NF and CoNiOOH–Ni<sub>3</sub>S<sub>2</sub>/NF with an amorphous/crystalline interface. Detailed characterizations and theoretical calculations demonstrate that the amorphous/crystalline interface in CoNiOOH–Ni<sub>3</sub>S<sub>2</sub>/NF shifts the d-band center upward, enhancing the adsorption of EG and *OH compared to amorphous CoNiOOH/NF. Enhanced *OH adsorption is crucial for promoting C–C bond cleavage and subsequent dehydrogenation. In situ electrochemical infrared absorption spectroscopy (IRAS) and theoretical calculations reveal that formate (FA) is primarily formed through cleavage of the C–C bond in glycolic acid, followed by oxidation. Notably, CoNiOOH–Ni<sub>3</sub>S<sub>2</sub>/NF achieves industrial-level current densities of 500 mA cm<sup>–2</sup> at an ultralow potential of 1.45 V vs RHE, with a Faradaic efficiency (FE) of 96.6% and FA productivity of 3.14 mmol cm<sup>–2</sup> h<sup>–1</sup> at 1.70 V vs RHE. This study offers valuable insights for designing efficient heterojunction catalysts for the electrochemical upcycling of PET plastics.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"75 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enantioselective Intermolecular Benzylic C–H Amination under Chiral Paddle-Wheel Diruthenium Catalysis
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-20 DOI: 10.1021/acscatal.4c06504
Kotoko Makino, Kohei Mori, Shoichi Kiryu, Taku Miyazawa, Yuhei Kumagai, Kosuke Higashida, Masahiro Kojima, Tatsuhiko Yoshino, Shigeki Matsunaga
{"title":"Enantioselective Intermolecular Benzylic C–H Amination under Chiral Paddle-Wheel Diruthenium Catalysis","authors":"Kotoko Makino, Kohei Mori, Shoichi Kiryu, Taku Miyazawa, Yuhei Kumagai, Kosuke Higashida, Masahiro Kojima, Tatsuhiko Yoshino, Shigeki Matsunaga","doi":"10.1021/acscatal.4c06504","DOIUrl":"https://doi.org/10.1021/acscatal.4c06504","url":null,"abstract":"A catalytic asymmetric intermolecular benzylic C–H amination was achieved under paddle-wheel diruthenium catalysis. A chiral diruthenium catalyst incorporating (<i>S</i>)-TPPTTL (tetraphenylphthaloyl-(<i>S</i>)-<i>tert</i>-leucine) ligand exhibited notable enantioselectivity, and aminated products were obtained with up to 99% ee. Unique chemoselectivity of the chiral diruthenium catalyst was also found for allylbenzene and alkyl-naphthalene substrates, demonstrating the complementary synthetic utility of chiral paddle-wheel Ru(II)–Ru(III) catalysts to Rh(II) counterparts.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"41 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
ML-Accelerated Automatic Process Exploration Reveals Facile O-Induced Pd Step-Edge Restructuring on Catalytic Time Scales
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-20 DOI: 10.1021/acscatal.4c06414
Patricia Poths, King Chun Lai, Francesco Cannizzaro, Christoph Scheurer, Sebastian Matera, Karsten Reuter
{"title":"ML-Accelerated Automatic Process Exploration Reveals Facile O-Induced Pd Step-Edge Restructuring on Catalytic Time Scales","authors":"Patricia Poths, King Chun Lai, Francesco Cannizzaro, Christoph Scheurer, Sebastian Matera, Karsten Reuter","doi":"10.1021/acscatal.4c06414","DOIUrl":"https://doi.org/10.1021/acscatal.4c06414","url":null,"abstract":"We combine automatic process exploration with an iteratively trained machine-learning interatomic potential to systematically identify elementary processes occurring during the initial oxidation of a Pd step edge. Corresponding process lists are a prerequisite to overcome prevalent predictive-quality microkinetic modeling approaches which consider only a minimum number of hand-selected and thus typically intuitive processes. The exploration readily generates close to 3000 inequivalent elementary processes and thus unveils a complexity far beyond current microkinetic modeling capabilities. Among these processes are numerous low-barrier processes involving the collective motion of several atoms that enable a facile O-mediated restructuring of the Pd step edge through the motion of larger Pd<sub><i>x</i></sub>O<sub><i>y</i></sub> units. The concomitant interconversion happens on time scales comparable to those of molecular processes of heterogeneous oxidation catalysis. This suggests a dynamic aspect of the <i>operando</i> evolution of the working interface reminiscent of the fluxionality discussed in nanocluster catalysis.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"11 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pincer-Ruthenium-Catalyzed Direct Formation of Fuel-Grade Alkanes via a Net-Decarboxylative Coupling of Alcohols
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-20 DOI: 10.1021/acscatal.4c05826
Pran Gobinda Nandi, Pabitra Maity, Akshai Kumar
{"title":"Pincer-Ruthenium-Catalyzed Direct Formation of Fuel-Grade Alkanes via a Net-Decarboxylative Coupling of Alcohols","authors":"Pran Gobinda Nandi, Pabitra Maity, Akshai Kumar","doi":"10.1021/acscatal.4c05826","DOIUrl":"https://doi.org/10.1021/acscatal.4c05826","url":null,"abstract":"The net-decarboxylative coupling of low-molecular weight alcohols to high-molecular weight alkanes has been investigated using a series of NNN pincer-Ru catalysts based on bis(imino)pyridine and 2,6-bis(benzimidazole-2-yl)pyridine ligands. Notably, a majority of the considered pincer-Ru complexes, including the Ru precursors, were either not very active or were unselective giving alkene/alkane mixtures. However, in the presence of 0.5 equiv of NaOH in toluene at 140 °C, the complex (<sup>MeBim2</sup>NNN)RuCl<sub>2</sub>(PPh<sub>3</sub>)<sub>2</sub> based on the 2,6-bis(benzimidazole-2-yl)pyridine ligand demonstrated very high activity giving up to 91% yield with 100% selectivity toward the alkane (1,3-diphenyl propane) starting from 2-phenyl ethanol after 24 h of reaction. On the other hand, the complex (<sup><i>i</i>Pr2</sup>NNN)RuCl<sub>2</sub>(PPh<sub>3</sub>) based on the bis(imino)pyridine ligand was found to be the least active and gave 14% 1,3-diphenyl propane at 25% selectivity. Experimental mechanistic studies point to the evolution of hydrogen (detected by GC) and formic acid (detected by <sup>1</sup>H NMR) during the reaction along with the involvement of organic intermediates such as α,β-unsaturated aldehydes. The [(<sup>MeBim2</sup>NNN)RuCl(PPh<sub>3</sub>)<sub>2</sub>]Cl catalyzed transformation of 2-phenyl ethanol to 1,3-diphenyl propane demonstrated a first-order dependence of the initial rate on the concentration of both the catalyst and the base. While catalyst poisoning experiments with Hg revealed the homogeneous and well-defined molecular nature of the catalyst, a few of these molecular species, including the resting state (<sup>MeBim2</sup>NNN)RuHCl (experimentally trapped as its PPh<sub>3</sub> adduct), have been identified by HRMS analysis and NMR studies. DFT studies complement the experimental findings and indicate that in the more favorable hydrogenolysis path, the dehydrogenolysis step is rate-determining (Δ<i>G</i><sub>140</sub><sup>‡</sup> = 22.81 kcal/mol), and it leads to the formation of 2-phenyl acetaldehyde along with the resting state (<sup>MeBim2</sup>NNN)RuHCl. On the other hand, the corresponding cycle with the least active catalyst (<sup><i>i</i>Pr2</sup>NNN)RuCl<sub>2</sub>(PPh<sub>3</sub>) that involved the insertion of 1,3-diphenyl propene into the Ru–H bond as the RDS had a relatively more unfavorable barrier of 27.81 kcal/mol. This work that provides direct access to jet-fuel-grade 1,3-diphenyl propane starting from 2-phenyl ethanol in a single-step, one-pot strategy offers great promise to open up exciting opportunities in this very important field of study.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"24 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142866989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis of Axially Chiral Vinyl Halides via Cu(I)-Catalyzed Enantioselective Radical 1,2-Halofunctionalization of Terminal Alkynes
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-20 DOI: 10.1021/acscatal.4c06672
Jun-Bin Tang, Jun-Qian Bian, Zhihan Zhang, Yong-Feng Cheng, Li Qin, Qiang-Shuai Gu, Peiyuan Yu, Zhong-Liang Li, Xin-Yuan Liu
{"title":"Synthesis of Axially Chiral Vinyl Halides via Cu(I)-Catalyzed Enantioselective Radical 1,2-Halofunctionalization of Terminal Alkynes","authors":"Jun-Bin Tang, Jun-Qian Bian, Zhihan Zhang, Yong-Feng Cheng, Li Qin, Qiang-Shuai Gu, Peiyuan Yu, Zhong-Liang Li, Xin-Yuan Liu","doi":"10.1021/acscatal.4c06672","DOIUrl":"https://doi.org/10.1021/acscatal.4c06672","url":null,"abstract":"Organohalides are crucial in modern organic synthesis, thanks to their robust and versatile reactivity in cross-coupling and other key transformations. However, catalytic asymmetric methods for producing enantioenriched organohalides, particularly axially chiral vinyl halides, remain underdeveloped. Here, we present a Cu(I)-catalyzed, highly enantioselective radical alkyne 1,2-halofunctionalization, utilizing custom-designed tridentate anionic <i>N,N,N</i>-ligands with bulky peripheral substituents. This method efficiently employs (hetero)aryl and alkyl sulfonyl chlorides, as well as α-carbonyl alkyl bromides, as radical precursors and utilizes a diverse range of 2-amino and 2-oxy aryl terminal alkynes as substrates to produce highly enantioenriched axially chiral vinyl halides. The reaction is scalable to gram quantities, and the vinyl halides can be further transformed into axially chiral thiourea, pyridyl carboxamide, and quinolyl sulfonamide compounds, some of which show significant potential in asymmetric catalysis. Both experimental and theoretical mechanistic studies support an enantioselective halogen atom transfer mechanism. This method opens an avenue for accessing axially chiral organohalides, facilitating their broad applications in various related fields.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"13 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New Insights into CO2 Electroreduction in Acidic Seawater
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-19 DOI: 10.1021/acscatal.4c05816
Chen Peng, Haifeng Shen, Min Zheng, Mietek Jaroniec, Yao Zheng, Shi-Zhang Qiao
{"title":"New Insights into CO2 Electroreduction in Acidic Seawater","authors":"Chen Peng, Haifeng Shen, Min Zheng, Mietek Jaroniec, Yao Zheng, Shi-Zhang Qiao","doi":"10.1021/acscatal.4c05816","DOIUrl":"https://doi.org/10.1021/acscatal.4c05816","url":null,"abstract":"The electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) is of great importance to produce valuable chemicals. In conventional alkaline and “acid + salts”-based CO<sub>2</sub>RR, the aqueous electrolyte normally needs to be refreshed due to the gradually more neutral feature of pH during electrolysis operation. Therefore, both solutes and deionized (DI) water in electrolytes are required to be regenerated regularly. In this work, acidic seawater (pH &lt; 2) was used as a low-cost but efficient electrolyte for CO<sub>2</sub>RR without salt addition. The Faradaic efficiencies (FEs) and partial current densities of C<sub>2+</sub> on typical copper in the “H<sub>2</sub>SO<sub>4</sub> in raw seawater” electrolyte are comparable with those for conventional “KOH in DI water” and much higher than those for “H<sub>2</sub>SO<sub>4</sub> + salts” systems. Moreover, single-pass carbon efficiencies (SPCEs) in acidic seawater are significantly higher than the values in alkaline DI water. Such an abnormal phenomenon was also demonstrated for CO and HCOOH generation on typical silver and tin catalysts, respectively. In situ Raman spectroscopy and controlled experiments revealed that metal (denoted as M) cations in seawater ensure a higher concentration of M·H<sub>2</sub>O species, which improve interactions with *CO<sub>2</sub><sup>–</sup>, while Cl<sup>–</sup> anions enhance the adsorption strength of key CO<sub>2</sub>RR intermediates (namely, *CO on copper, *COO<sup>–</sup> on silver, and *OCHO on tin). Through these interactions with water molecules and CO<sub>2</sub>RR intermediates, such free but functional ions in seawater play a highly important role in promoting selectivity and activity for CO<sub>2</sub>RR, as well as SPCE in acidic seawater. Furthermore, using acidic seawater as an alternative CO<sub>2</sub>RR electrolyte has significant economic and ecological benefits compared with traditional alkaline DI water electrolytes.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"53 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142849836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pd Nanoparticles Decorated by Oxidized Ru Clusters for Efficient C–H/C–H Coupling of Arenes
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-19 DOI: 10.1021/acscatal.4c05551
Shingo Hasegawa, Shunta Tokutake, Koji Harano, Ken Motokura
{"title":"Pd Nanoparticles Decorated by Oxidized Ru Clusters for Efficient C–H/C–H Coupling of Arenes","authors":"Shingo Hasegawa, Shunta Tokutake, Koji Harano, Ken Motokura","doi":"10.1021/acscatal.4c05551","DOIUrl":"https://doi.org/10.1021/acscatal.4c05551","url":null,"abstract":"Oxidative homocoupling of arenes is a challenging but attractive method for converting nonactivated aromatics into biaryl compounds. Applications and the mechanistic understanding of bimetallic nanocatalysts for arene C–H bond activation are limited at present. In this study, we found that a Pd–Ru bimetallic catalyst supported on Al<sub>2</sub>O<sub>3</sub> showed remarkably high catalytic activity for the oxidative homocoupling of arenes owing to the synergistic effect between Pd and Ru. Structural analyses by high-angle annular dark-field scanning transmission electron microscopy with energy-dispersive X-ray spectroscopy and X-ray absorption spectroscopy revealed that the Pd nanoparticles were decorated by partially oxidized Ru clusters. Mechanistic studies indicated that the arene C–H bond cleavage was the rate-determining step and proceeded by a concerted metalation–deprotonation mechanism. It was proposed that the role of Ru is promoting the C–H activation step by generating electron-deficient Pd sites, which was supported by DFT calculations. The Ru-decorated Pd nanoparticles showed large turnover numbers for simple arenes.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"55 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Controlling Co 3d/O 2p Orbital Hybridization in LaCoO3 by Modulating the Co–O–Co Bond Angle for Enhanced Oxygen Evolution Reaction Catalysis
IF 12.9 1区 化学
ACS Catalysis Pub Date : 2024-12-19 DOI: 10.1021/acscatal.4c05479
Baoxin Ge, Pengyang Jiang, Biyi Chen, Caijin Huang
{"title":"Controlling Co 3d/O 2p Orbital Hybridization in LaCoO3 by Modulating the Co–O–Co Bond Angle for Enhanced Oxygen Evolution Reaction Catalysis","authors":"Baoxin Ge, Pengyang Jiang, Biyi Chen, Caijin Huang","doi":"10.1021/acscatal.4c05479","DOIUrl":"https://doi.org/10.1021/acscatal.4c05479","url":null,"abstract":"The orbital hybridization between metal and oxygen of perovskite catalysts can lower the overpotential and enhance the oxygen evolution reaction (OER) activity. This study combines density functional theory with experiments to clarify how Sr/Fe codoping modulates orbital hybridization and enhances OER catalytic activity of LaCoO<sub>3</sub>. The as-prepared La<sub>0.50</sub>Sr<sub>0.50</sub>Co<sub>0.75</sub>Fe<sub>0.25</sub>O<sub>3</sub> shows remarkable performance with a low overpotential of 310 mV at 10 mA cm<sup>–2</sup> current density and a 107.03 mV dec<sup>–1</sup> Tafel slope, outperforming most state-of-the-art perovskite-based OER electrocatalysts. The experimental results confirm that Sr/Fe codoping enhances the expansion of Co–O–Co bond angles and strengthens the covalency of the Co–O bond in LaCoO<sub>3</sub>, leading to enhanced electrocatalytic activity. Moreover, increasing Sr doping reduces the distance between the Co 3d/O 2p center and the Fermi level, decreasing the energy difference between them and enhancing the degree of orbital hybridization between Co 3d and O 2p. As the degree of Co 3d/O 2p orbital hybridization increases, a higher charge transfer was found between the active center and intermediate product, OOH, reducing the energy barrier of the rate-determining step while lowering the overpotential. This study provides thorough insight into the rational design of OER catalysts based on orbital hybridization.","PeriodicalId":9,"journal":{"name":"ACS Catalysis ","volume":"11 1","pages":""},"PeriodicalIF":12.9,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142858192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信