Chem Catalysis最新文献_第6页

Boosting active hydrogen generation by anchored Ru sites in Co3O4 for nitrate-to-ammonia electrosynthesis 通过锚定 Co3O4 中的 Ru 位点提高硝酸-氨电合成中的活性制氢能力

IF 9.4

Chem Catalysis Pub Date : 2024-10-17 DOI: 10.1016/j.checat.2024.101152

Zhaole Lu, Rong Yang, Yingchao Yu, Yuting Wang, Bin Zhang, Lingjun Kong

{"title":"Boosting active hydrogen generation by anchored Ru sites in Co3O4 for nitrate-to-ammonia electrosynthesis","authors":"Zhaole Lu, Rong Yang, Yingchao Yu, Yuting Wang, Bin Zhang, Lingjun Kong","doi":"10.1016/j.checat.2024.101152","DOIUrl":"https://doi.org/10.1016/j.checat.2024.101152","url":null,"abstract":"The electrochemical reduction of nitrate to ammonia can serve as an effective complement to the traditional Haber-Bosch process. Currently, rapid and continuous ammonia production is challenging because of the multistep hydrogenation process and the constant alkalinization of the electrolyte. Herein, Ru atoms are incorporated into the octahedral sites of Co3O4 to achieve an ammonia yield rate of 24.6 mg h−1 cm−2. Electrochemical in situ spectroscopic analyses and theoretical calculations reveal that Ru sites improve water molecule coverage and facilitate the production of active hydrogen atoms, leading to stable and orderly ammonia production. Furthermore, a peak power density of 32.28 mW cm−2, a high ammonia Faradaic efficiency of 98.2%, and excellent durability (91 h) are achieved in a Ru-Co3O4-based Zn-nitrate battery, indicating its practical applicability. This work may provide a method for efficient nitrate reduction to ammonia or other hydrogenation reactions via the synergistic modulation of active sites.","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":"3 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum confinement for stable nickel catalyst in hydrogen oxidation 氢氧化中稳定镍催化剂的量子约束

IF 9.4

Chem Catalysis Pub Date : 2024-10-17 DOI: 10.1016/j.checat.2024.101150

Jihyeon Park, Drew Higgins

引用次数: 0

Strong metal-support interaction between Ni and BaCO3 boosts CO2 hydrogenation 镍和 BaCO3 之间强烈的金属支撑相互作用促进了二氧化碳加氢反应

IF 9.4

Chem Catalysis Pub Date : 2024-10-17 DOI: 10.1016/j.checat.2024.101143

Hai Wang, Liang Wang

引用次数: 0

Synergistic effects in organic mixtures for enhanced catalytic hydrogenation and hydrodeoxygenation 有机混合物中增强催化加氢和加氢脱氧的协同效应

IF 9.4

Chem Catalysis Pub Date : 2024-10-16 DOI: 10.1016/j.checat.2024.101135

Ankit Mathanker, Sahil Halarnkar, Bolton Tran, Nirala Singh, Bryan R. Goldsmith

{"title":"Synergistic effects in organic mixtures for enhanced catalytic hydrogenation and hydrodeoxygenation","authors":"Ankit Mathanker, Sahil Halarnkar, Bolton Tran, Nirala Singh, Bryan R. Goldsmith","doi":"10.1016/j.checat.2024.101135","DOIUrl":"https://doi.org/10.1016/j.checat.2024.101135","url":null,"abstract":"The hydrogenation and hydrodeoxygenation (HDO) of organic mixtures are important processes in bio-oil conversion and plastics upcycling. Understanding how the presence of co-reactants in organic mixtures affects the kinetics is critical for designing reactors that can convert these mixtures into desired products. Here, we discuss cases in (electro)catalysis where the presence of a co-reactant R2 enhances the rate of hydrogenation or HDO of another reactant R1 beyond the rate if only R1 is present. We divide the discussion into simple and complex mutual influences. Simple mutual influences occur when the presence of R2 does not change the mechanism or values of rate constants of elementary steps for R1. A complex mutual influence of R2 on R1 occurs if the presence of R2 changes the rate constants of elementary steps involving R1. We discuss challenges and opportunities in discerning the different mutual influences and increasing their synergistic effects in organic mixtures.","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":"66 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440410","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chiral pyrrolidines via an enantioselective Hofmann-Löffler-Freytag reaction 通过对映选择性 Hofmann-Löffler-Freytag 反应制备手性吡咯烷酮

IF 9.4

Chem Catalysis Pub Date : 2024-10-16 DOI: 10.1016/j.checat.2024.101149

Pavitra Laohapaisan, Ipshita Roy, David A. Nagib

引用次数: 0

Sulfur-facilitated in situ deep reconstruction of transition metal molybdates toward superior electrocatalytic oxidation of alkaline seawater 硫促进过渡金属钼酸盐原位深度重构，实现碱性海水的卓越电催化氧化作用

IF 9.4

Chem Catalysis Pub Date : 2024-10-15 DOI: 10.1016/j.checat.2024.101144

Zhan Zhao, Shiyu Qin, Xiang Li, Jianpeng Sun, Zizhen Li, Xiangchao Meng

{"title":"Sulfur-facilitated in situ deep reconstruction of transition metal molybdates toward superior electrocatalytic oxidation of alkaline seawater","authors":"Zhan Zhao, Shiyu Qin, Xiang Li, Jianpeng Sun, Zizhen Li, Xiangchao Meng","doi":"10.1016/j.checat.2024.101144","DOIUrl":"https://doi.org/10.1016/j.checat.2024.101144","url":null,"abstract":"Inducing the rapid and deep self-reconstruction of anodes has the potential to achieve the desired structure for effective oxygen evolution reactions (OERs) in seawater, but it is challenging. Herein, sulfur-assisted structural reconstruction of transition metal molybdates was fabricated. Benefiting from the electronic escape effect that occurs due to metal–O/–S bonding orbitals in the pre-catalyst, deep electrochemical reconstruction to highly active S-doped oxyhydroxides was achieved via rational S–metal hybridization and phase transition in the pre-catalyst. Meanwhile, combining the theoretical calculations and spectroscopic tests, it was found that introducing S atoms into oxyhydroxides activated lattice oxygen atoms, thereby boosting the intrinsic OER activity following the lattice oxygen mechanism pathway. As tested, the final S-doped oxyhydroxide catalysts exhibited excellent electrocatalytic activity with an ultralow overpotential of 166 mV at 10 mA cm−2 in alkaline seawater oxidation. This work showcased a feasible strategy of sulfur-assisted structural reconstruction to fabricate highly efficient and chemically stable materials for seawater splitting.","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":"66 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron paramagnetic resonance spectroscopy for the analysis of single-atom catalysts 电子顺磁共振光谱法用于分析单原子催化剂

IF 9.4

Chem Catalysis Pub Date : 2024-10-15 DOI: 10.1016/j.checat.2024.101136

Mikhail Agrachev, Vera Giulimondi, Ivan Surin, Sharon Mitchell, Gunnar Jeschke, Javier Pérez-Ramírez

引用次数: 0

An enzymatic cascade for high-yield and stereoselective synthesis of 4-fluoro-L-threonine 高产率和立体选择性合成 4-氟-L-苏氨酸的酶级联反应

IF 9.4

Chem Catalysis Pub Date : 2024-10-15 DOI: 10.1016/j.checat.2024.101148

Alberto De Maria, Manuel Nieto-Domínguez, Phillip T. Lowe, David O′Hagan, Pablo I. Nikel

引用次数: 0

Utilizing operando catalyst regeneration to uncover insights in the methanol-to-hydrocarbons process 利用操作性催化剂再生技术揭示甲醇制烃类工艺的奥秘

IF 9.4

Chem Catalysis Pub Date : 2024-10-15 DOI: 10.1016/j.checat.2024.101134

Sophie H. van Vreeswijk, Luke A. Parker, Arnaud T. Sanderse, Ramon Oord, Florian Meirer, Bert M. Weckhuysen

{"title":"Utilizing operando catalyst regeneration to uncover insights in the methanol-to-hydrocarbons process","authors":"Sophie H. van Vreeswijk, Luke A. Parker, Arnaud T. Sanderse, Ramon Oord, Florian Meirer, Bert M. Weckhuysen","doi":"10.1016/j.checat.2024.101134","DOIUrl":"https://doi.org/10.1016/j.checat.2024.101134","url":null,"abstract":"The methanol-to-hydrocarbons (MTH) catalyst deactivation is reversible, and deactivating coke molecules can be removed via regeneration experiments. Regeneration of small-pore zeolite SSZ-13 first leads to the elimination of polyaromatic deactivating compounds, leaving the active aromatic intermediates intact. Partial regeneration experiments can provide an alternative approach to study small-pore zeolites by mimicking co-feeding of aromatic intermediates. Catalyst properties and reaction intermediates were followed with operando UV-visible spectroscopy and X-ray diffraction. It was shown that all the coke is formed within the zeolite cages and that the lattice expansion is due to the formation of hydrocarbon molecules. Additionally, indications for separate reaction mechanisms to produce ethylene and propylene were established. With confocal fluorescence microscopy (CFM), it was determined that upon regeneration, the hydrocarbons were less conjugated and more homogeneously distributed. A full hydrocarbon pool mechanism was established for the MTH reaction over zeolite SSZ-13.","PeriodicalId":53121,"journal":{"name":"Chem Catalysis","volume":"23 1","pages":""},"PeriodicalIF":9.4,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142435997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Next-generation functional surfactant for mild C−H arylation under micellar conditions 用于胶束条件下温和 C-H 芳基化的新一代功能表面活性剂

IF 9.4

Chem Catalysis Pub Date : 2024-10-10 DOI: 10.1016/j.checat.2024.101146

Pascal Hauk, Sven Trienes, Fabrice Gallou, Lutz Ackermann, Joanna Wencel-Delord

引用次数: 0