Kai Xu , Na Jiang , Peng Wang , Wei-Wei Wang , Chun-Jiang Jia
{"title":"Highly efficient cobalt catalysts promoted by CeO2–Al2O3 for ammonia decomposition†","authors":"Kai Xu , Na Jiang , Peng Wang , Wei-Wei Wang , Chun-Jiang Jia","doi":"10.1039/d4cy00835a","DOIUrl":"10.1039/d4cy00835a","url":null,"abstract":"<div><div>Hydrogen production by ammonia decomposition reveals great advantages in the utilization of hydrogen. Low-cost, efficient and stable transition metal catalysts are the key for the ammonia decomposition reaction. Using multi-component promoters adjust the electronic and geometric structures of bulk catalysts, which might be an effective approach for obtaining non-noble metal catalysts with excellent performance. In this work, CeO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> bi-promoters were used and significantly improved the catalytic performance of bulk cobalt catalysts. The optimized CoCeAlO<sub>x</sub> catalyst achieved 94.3% and 65.3% NH<sub>3</sub> conversion at 550 °C and 500 °C (GHSV = 30 000 mL g<sub>cat</sub><sup>−1</sup> h<sup>−1</sup>), respectively, and exhibited strong stability within 200 h. It was found that the interaction between Co–CeO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> effectively inhibited the aggregation of the Co<sup>0</sup> active species, which enormously promoted the catalytic activity and stability of CoCeAlO<sub>x</sub>. CeO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> bi-promoters adjusted the surface properties of catalysts, bringing suitable NH<sub>3</sub> adsorption and N<sub>2</sub> desorption, and suppressing the hydrogen poisoning significantly. This work provided a reliable strategy for the construction of high-efficiency catalysts working under the harsh conditions for ammonia decomposition.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5678-5686"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Aijing Ma , Zaitian Tan , Wenjie Liu , Xueqian Li , Kaibo Wang , Yiming Zhang , Xuan Jiao , Jiahao Li , Yuanyuan Yang , Feiyan Fu
{"title":"Construction of visible light active CuS/MoS2 heterojunctions for heightened photoreduction of Cr(vi)","authors":"Aijing Ma , Zaitian Tan , Wenjie Liu , Xueqian Li , Kaibo Wang , Yiming Zhang , Xuan Jiao , Jiahao Li , Yuanyuan Yang , Feiyan Fu","doi":"10.1039/d4cy00598h","DOIUrl":"10.1039/d4cy00598h","url":null,"abstract":"<div><div>CuS/MoS<sub>2</sub> heterojunctions were fabricated by a facile one-step hydrothermal method and evaluated <em>via</em> the photoreduction of Cr(<span>vi</span>) under visible light irradiation. The CuS/MoS<sub>2</sub> heterojunctions demonstrated a hierarchical porous structure, self-assembled from intersecting thin nanosheets, which resulted in a flower-like morphology. The optimized CuS/MoS<sub>2</sub> heterojunction (CuS/MoS<sub>2</sub>-4.6) exhibited superior photocatalytic performance toward the removal of Cr(<span>vi</span>) under visible light with a <em>k</em> value of 1.33 × 10<sup>−2</sup> min<sup>−1</sup>, which was much higher than that of pure CuS (2.13 × 10<sup>−4</sup> min<sup>−1</sup>) and MoS<sub>2</sub> (4.39 × 10<sup>−4</sup> min<sup>−1</sup>). The enhanced Cr(<span>vi</span>) photoreduction performance was ascribed to the construction of a type II CuS/MoS<sub>2</sub> heterojunction, in which electrons in the conduction band (CB) of CuS were transferred to the CB of MoS<sub>2</sub> due to the favorable band alignment, while holes in the valence band (VB) of MoS<sub>2</sub> flowed to the VB of CuS. This led to the efficient spatial separation and transfer of electrons and holes, inhibiting the recombination of photogenerated carriers, thus boosting the remarkable photocatalytic activity. This work provides a prospective heterojunction catalyst for photoreduction of Cr(<span>vi</span>).</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5746-5754"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jing Wang , Shenshen Ouyang , Ye Wang , Xusheng Wang , Xiaohui Ren , Li Shi
{"title":"Unraveling the impact of Ag dopant in Zn–In–S colloidal nanocrystals for boosting visible-light-driven photocatalytic CO2 reduction†","authors":"Jing Wang , Shenshen Ouyang , Ye Wang , Xusheng Wang , Xiaohui Ren , Li Shi","doi":"10.1039/d4cy00716f","DOIUrl":"10.1039/d4cy00716f","url":null,"abstract":"<div><div>The development of durable and effective photocatalysts is significant for realizing efficient photocatalytic CO<sub>2</sub> conversion. In this work, heteroatom doped Zn–In–S colloidal nanocrystals are fabricated <em>via</em> a facile method, which can be utilized for photocatalytic CO<sub>2</sub> reduction under visible light in the presence of triethanolamine. Among various dopants, Ag shows the most effectiveness for improving the photocatalytic CO<sub>2</sub> reduction performance of Zn–In–S colloidal nanocrystals. The optimized Ag doped Zn–In–S colloidal nanocrystals with doping amount of 1.13 wt% exhibit the highest photocatalytic CO<sub>2</sub> reduction performance with a CO evolution rate of 30.29 μmol h<sup>−1</sup>, achieving high selectivity of 96.06%. The photocatalytic mechanism study indicates that increasing the doping amount of Ag in Zn–In–S colloidal crystals would result in the improved visible light harvesting ability, increased charge carrier lifetime and weakened reduction potential of electrons, which exert a synergistic effect on the CO<sub>2</sub> photoreduction.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5616-5623"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuangju Li , Xueli Cheng , Wei Zhou , Junxiang Jiang , Chao Feng , Yuanshuai Liu , Xuebing Li , Xiaodong Zhang , Zhong Wang
{"title":"Morphology dependence of Nb2O5-supported cobalt oxide in catalytic toluene oxidation†","authors":"Shuangju Li , Xueli Cheng , Wei Zhou , Junxiang Jiang , Chao Feng , Yuanshuai Liu , Xuebing Li , Xiaodong Zhang , Zhong Wang","doi":"10.1039/d4cy00596a","DOIUrl":"10.1039/d4cy00596a","url":null,"abstract":"<div><div>This research describes the preparation of cobalt-based catalysts supported on Nb<sub>2</sub>O<sub>5</sub> substrates of various forms: rods (Nb<sub>2</sub>O<sub>5</sub>-R), grids (Nb<sub>2</sub>O<sub>5</sub>-G), and spherical structures (Nb<sub>2</sub>O<sub>5</sub>-S). These catalysts demonstrated diverse reactivity in toluene oxidation, which correlated with their individual physical and chemical traits and the interfacial interaction between cobalt oxide and the Nb<sub>2</sub>O<sub>5</sub> support. Notably, the catalyst with a spherical Nb<sub>2</sub>O<sub>5</sub> support (CoO<sub>x</sub>/Nb<sub>2</sub>O<sub>5</sub>-S) outperformed the catalysts with other supports and showed the best activity in oxidizing toluene. The investigation underscored the role of the unique features of the Nb<sub>2</sub>O<sub>5</sub> substrate in augmenting the catalyst's efficacy in toluene adsorption and activation. Density functional theory (DFT) revealed more facile toluene adsorption on CoO<sub>x</sub>/Nb<sub>2</sub>O<sub>5</sub>-S (−0.65 eV) and reduced energy requirements for oxygen vacancy creation and adsorption. This suggested that the CoO<sub>x</sub>/Nb<sub>2</sub>O<sub>5</sub>-S catalyst enhanced surface oxygen mobility and boosted catalytic efficiency.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5722-5730"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Substrate-directed C(sp3)–H borylation via transition metal catalysis: expanding the toolbox for C–H functionalization","authors":"Dolly David Thalakottukara , Manikandan Sekar , Astam Mandal , Thirumanavelan Gandhi , Debabrata Maiti","doi":"10.1039/d4cy00754a","DOIUrl":"10.1039/d4cy00754a","url":null,"abstract":"<div><div>Organoborons play a crucial role in organic synthesis, easing the construction of C–C and C–X bonds, which in turn sensitize C–H borylation reactions. In the context of inert C(sp<sup>3</sup>)–H borylation, significant efforts have been dedicated to achieve site- and chemoselectivity by involving directing groups <em>via</em> transition metal catalysis. This review highlights various types of directing groups that can enable intricate and distal C(sp<sup>3</sup>)–H borylation; heteroatoms such as P, N, B, Si, Br, O, and Cl, which are attached to the substrate, act as the directing group. In addition to homogeneous catalysis, the occurrence of heterogeneous catalysis was realized, and the considerable contribution to chiral C(sp<sup>3</sup>)–H borylation is discussed. Finally, this review summarizes the mechanistic aspects and late-stage modifications of complex molecules.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5488-5504"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiaxin Li , Hongmei Yu , Jingchen Na , Senyuan Jia , Yutong Zhao , Kaiqiu Lv , Wenzhuo Zhang , Jun Chi , Zhigang Shao
{"title":"Recent advances in selective methanol oxidation electrocatalysts for the co-production of hydrogen and value-added formate†","authors":"Jiaxin Li , Hongmei Yu , Jingchen Na , Senyuan Jia , Yutong Zhao , Kaiqiu Lv , Wenzhuo Zhang , Jun Chi , Zhigang Shao","doi":"10.1039/d4cy00727a","DOIUrl":"10.1039/d4cy00727a","url":null,"abstract":"<div><div>Traditional water splitting is significantly impeded by the sluggish kinetics and large overpotential of the anodic oxygen evolution reaction (OER). Accordingly, replacing the OER with a more thermodynamically favorable organic substance oxidation reaction to combine with the hydrogen evolution reaction (HER) is an innovative strategy to obtain green hydrogen. In this case, the electro-reforming of methanol coupled with the electrochemical HER can realize the energy-saving co-generation of value-added formate and hydrogen. Therefore, controlling the process of methanol oxidation and making it selectively transform to formate have become a worthy topic. Thus far, various catalysts and modification strategies have been developed for the selective methanol oxidation reaction (SMOR). Transition metal-based materials are the most studied catalysts because their moderate catalytic ability can better control the process of methanol oxidation. Electronic structure modulation is the most efficient strategy to improve the SMOR performance of catalysts. However, few systematic reviews on the SMOR have been reported. In light of significant advances achieved recently, herein, we reviewed the recent advances in SMOR electrocatalysts for the co-production of value-added formate and green hydrogen. In particular, the mechanism of the SMOR is initially introduced, including the traditional surface adsorption mechanism and the newly developed lattice oxygen participation mechanism. Subsequently, strategies for catalyst design are analyzed from the aspects of chemical bond activation/inhibition, electronic structure manipulation, dual active site construction, and increasing the number of active sites. Thereafter, performance descriptors involving electrochemical measurements and product detection are discussed to show the basic evaluation criterion, and various catalysts for the SMOR are categorized according to their composition to display the development of catalysts. Finally, conclusions and perspectives are presented. We hope that this comprehensive effort will be helpful in the literature survey of the SMOR and provide inspiration to the SMOR research community, attracting more attention to the electro-upgradation of organic substances coupled with green hydrogen generation.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5525-5544"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/cy/d4cy00727a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chuye Quan , Shilei Ji , Ruijia Yao , Ming Du , Chen Chen , Xiaoyang He , Ran Cai , Jianping Yang , Xing'ao Li
{"title":"Layerwise replacement method to achieve high solar-to-hydrogen efficiency for photocatalytic water splitting: a first principles study†","authors":"Chuye Quan , Shilei Ji , Ruijia Yao , Ming Du , Chen Chen , Xiaoyang He , Ran Cai , Jianping Yang , Xing'ao Li","doi":"10.1039/d4cy00688g","DOIUrl":"10.1039/d4cy00688g","url":null,"abstract":"<div><div>Atomically layered stacking (ALS) two-dimensional (2D) materials, owing to their superior electrical properties and flexible tunability in addition to the advantages of traditional 2D materials, have garnered widespread attention in recent years. However, when used as photocatalysts for overall water splitting (OWS), many of them face challenges like low Solar-to-Hydrogen (STH) efficiency and insufficient driving force for photoinduced redox reactions. Here, using Al<sub>2</sub>X<sub>3</sub> (X = S, Se) as samples, we demonstrate the potential of the Layerwise Replacement Method (LRM) in reducing the materials' bandgap, improving their light absorption performance, and boosting the STH efficiency. As anticipated, the Al<sub>2</sub>S<sub>2</sub>Se-t and Al<sub>2</sub>TeSe<sub>2</sub>-m monolayers demonstrate STH efficiencies exceeding 20%, surpassing the performance of the majority of reported photocatalysts. Additionally, under light excitation, the OER reaction on the Al<sub>2</sub>S<sub>2</sub>Se-t monolayer is exothermic, while on the Al<sub>2</sub>TeSe<sub>2</sub>-m monolayer, the OER energy barrier is reduced to 0.431 eV. Notably, on both materials, the HER energy barriers are approaching 0 eV. The improvement of these properties is primarily ascribed to the modulation of the materials' bandgap <em>via</em> the LRM, and secondarily to the reconstruction of the vertically intrinsic electric field (IEF). Our work not only offers a fresh perspective for the precise manipulation of atomically layered stacked 2D materials but also provides a rational strategy for designing novel and outstanding photocatalysts.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":"14 19","pages":"Pages 5644-5652"},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ting-Hao Liu, Shuai Fu, Jin-Tao Gou, Yin-Sheng Zhang, Chang-Wei Hu and Hua-Qing Yang
{"title":"Synergistic promotion of oxygen vacancy and Lewis acidity of Nb2O5 on the preferential hydroxymethyl hydrogenolysis of 5-hydroxymethylfurfural catalyzed by single atom Pt†","authors":"Ting-Hao Liu, Shuai Fu, Jin-Tao Gou, Yin-Sheng Zhang, Chang-Wei Hu and Hua-Qing Yang","doi":"10.1039/D4CY00559G","DOIUrl":"https://doi.org/10.1039/D4CY00559G","url":null,"abstract":"<p >Pt<small><sub>1</sub></small>/Nb<small><sub>2</sub></small>O<small><sub>5</sub></small> exhibits good catalytic performance towards the hydrogenolysis/hydrogenation of HMF. However, the chemical nature that affects its activity and selectivity is not yet clear at the molecular level. For Pt<small><sub>1</sub></small>/Nb<small><sub>2</sub></small>O<small><sub>5</sub></small>, two kinds of Pt-containing active sites are modelled, <em>i.e.</em>, [–(NbO)PtNb(ONb)<small><sub>5</sub></small>–] ([OPtNb]) in the absence of oxygen vacancy, and [–(NbO)PtNb(ONb)<small><sub>4</sub></small>–] ([OPtNb-O<small><sub>v</sub></small>]) in the presence of oxygen vacancy. Over both [OPtNb-O<small><sub>v</sub></small>] and [OPtNb], the catalytic mechanism for hydrogenolysis/hydrogenation of 5-hydroxymethylfurfural (HMF) with H<small><sub>2</sub></small> as an H-source has been theoretically investigated in tetrahydrofuran solution at the GGA-PBE/DNP level. The hydrogenolysis of –CH<small><sub>2</sub></small>OH (hydroxymethyl) groups to –CH<small><sub>3</sub></small> groups is predominated with the cleavage of –CH<small><sub>2</sub></small>–OH bonds as the rate-determining step, whereas the hydrogenation of –CHO (aldehyde) groups to –CH<small><sub>2</sub></small>OH groups is very minor with the addition of –CHO groups as the rate-determining step. Here, 5-methylfurfural (5-MF) is predominant, whereas 2,5-dihydroxymethylfuran (DHMF) is very minor. The strong Lewis acidity of Nb<small><sub>2</sub></small>O<small><sub>5</sub></small> promotes the Pt-site to accept the lone pair electrons of the oxygen atom, in which the oxygen atom of the –CH<small><sub>2</sub></small>OH group is more prone than that of the –CHO group to donate its lone pair electrons to the Pt-site. Thus, Pt<small><sub>1</sub></small>/Nb<small><sub>2</sub></small>O<small><sub>5</sub></small> facilitates the hydrogenolysis of the –CH<small><sub>2</sub></small>OH group and relatively inhibits the hydrogenation of the –CHO group. Compared with [OPtNb], [OPtNb-O<small><sub>v</sub></small>] displays higher catalytic activity. This stems from the promoting effect of oxygen vacancy on the capacity of the Pt-site to receive lone pair electrons of the oxygen atom in the –CH<small><sub>2</sub></small>OH group.</p>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":" 22","pages":" 6550-6560"},"PeriodicalIF":4.4,"publicationDate":"2024-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nien-Chi Chang Liao, R. Sidick Basha, Bo-Hao Shih, Chia-Chun Liu, Miao-Han Wang, Po-Heng Lin and Chin-Fa Lee
{"title":"Copper cluster complex-catalyzed C–S bond formation†","authors":"Nien-Chi Chang Liao, R. Sidick Basha, Bo-Hao Shih, Chia-Chun Liu, Miao-Han Wang, Po-Heng Lin and Chin-Fa Lee","doi":"10.1039/D4CY00968A","DOIUrl":"https://doi.org/10.1039/D4CY00968A","url":null,"abstract":"<p >Three distinct copper cluster complexes (<strong>A–C</strong>) containing Cu–O ligated Schiff-base ligands were synthesized and their bonding was investigated by single-crystal X-ray crystallographic studies. These complexes effectively catalyze the C–S cross coupling reaction of less reactive aliphatic thiols to synthesize thioether derivatives. This coupling reaction also tolerates well and is compatible with aryl thiols. The peculiar C(sp<small><sup>2</sup></small>)–SC(sp<small><sup>3</sup></small>) bond formation distinctly took place with high efficiency using low loading of copper cluster complex catalysts. The present report describes an alternative protocol to construct active copper cluster complexes from readily accessible, cheap and efficient ligands. These complexes are air stable, practical, easy to handle and catalyze C–S coupling reactions with good yields.</p>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":" 22","pages":" 6609-6620"},"PeriodicalIF":4.4,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Switching of selectivity from benzaldehyde to benzoic acid using MIL-100(V) as a heterogeneous catalyst in aerobic oxidation of benzyl alcohol†","authors":"Duygu Hacıefendioğlu and Ali Tuncel","doi":"10.1039/D4CY00832D","DOIUrl":"https://doi.org/10.1039/D4CY00832D","url":null,"abstract":"<p >A vanadium-centered metal organic framework [MIL-100(V)] was synthesized as a heterogeneous catalyst allowing the selectivity to be switched from almost quantitative formation of benzaldehyde (Bz-CHO) to quantitative formation of benzoic acid (Bz-COOH) by changing only the temperature in the aerobic oxidation of benzyl alcohol (Bz-OH). The aerobic oxidation of Bz-OH was performed using molecular oxygen or air in the temperature range of 60–120 °C. A Bz-CHO formation yield of 98.1% was obtained with quantitative Bz-OH conversion at 80 °C. When the oxidation temperature was set to 100 °C, a Bz-COOH formation yield of 100% was achieved with quantitative Bz-OH conversion. The suitability of a serial reaction mechanism including Bz-CHO formation from Bz-OH and Bz-COOH formation from Bz-CHO as the first and second stage reactions, respectively was investigated for the aerobic oxidation process. The apparent first-order rate constants determined for first and second stage reactions demonstrated that the first-stage reaction was faster with respect to the second one. The proposed kinetic model allowed the calculation of apparent activation energies for Bz-CHO formation from Bz-OH and Bz-COOH formation from Bz-CHO as 77.3 and 149.2 kJ mol<small><sup>−1</sup></small>, respectively. The presence of hydroxyl (·OH) and superoxide anion (O<small><sub>2</sub></small>˙<small><sup>−</sup></small>) radicals in the aerobic oxidation was demonstrated by radical scavenging runs. A mechanism was proposed based on the crystalline structure of MIL-100(V) and the radical types identified by the scavenging runs. This study opens a new path for tuning of selectivity towards Bz-CHO or Bz-COOH, for the first time, using a transition metal based catalyst synthesized by a one-pot hydrothermal reaction.</p>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":" 22","pages":" 6524-6536"},"PeriodicalIF":4.4,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/cy/d4cy00832d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142598705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}