Catalysis Science & Technology最新文献

Facile in situ construction strategy to deposit Mn0.5Cd0.5S nanoparticles on TiO2 nanosheets for highly efficient visible light photocatalytic degradation of tetracycline 在 TiO2 纳米片上沉积 Mn0.5Cd0.5S 纳米粒子的简便原位构建策略，用于高效可见光光催化降解四环素

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00868e

{"title":"Facile in situ construction strategy to deposit Mn0.5Cd0.5S nanoparticles on TiO2 nanosheets for highly efficient visible light photocatalytic degradation of tetracycline","authors":"","doi":"10.1039/d4cy00868e","DOIUrl":"10.1039/d4cy00868e","url":null,"abstract":"<div><div>Developing a highly efficient visible-light-driven TiO<sub>2</sub>-based photocatalyst for the degradation of tetracycline remains challenging due to the high photogenerated electron/hole recombination rate and narrow visible light response range of TiO<sub>2</sub>. To address these problems, novel heterojunctions are fabricated by coupling TiO<sub>2</sub> nanosheets with Mn<sub>0.5</sub>Cd<sub>0.5</sub>S nanoparticles as visible-light photocatalysts. The as-synthesized photocatalysts exhibit high photogenerated electron/hole separation efficiency and enhanced visible-light absorption due to the well-matched energy levels, leading to the highly efficient degradation of tetracycline under visible light irradiation and excellent recyclability. The degradation efficiency of the optimum MCS/TiO<sub>2</sub>-II photocatalyst could reach 90% within 120 min, which was about 2.5 times and 6.9 times higher than those of MCS and TiO<sub>2</sub>, respectively. Furthermore, the degradation mechanism of tetracycline was revealed in depth based on the trapping experiments, XPS, photoelectrochemical characterizations, and DFT calculations. Therefore, this work provides an effective approach to explore excellent photocatalysts to realize the highly efficient removal of refractory tetracycline under visible light.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205501","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}

引用次数: 0

Ligand coordination controlled by monomer binding: a hint from DFT for stereoselective lactide polymerization† 受单体结合控制的配体配位：DFT 为立体选择性内酯聚合提供的提示

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00937a

{"title":"Ligand coordination controlled by monomer binding: a hint from DFT for stereoselective lactide polymerization†","authors":"","doi":"10.1039/d4cy00937a","DOIUrl":"10.1039/d4cy00937a","url":null,"abstract":"<div><div>Stereoselective ring opening polymerization (ROP) of racemic lactide (<em>rac</em>-LA) is a challenging goal because a rationale connecting the catalyst structure and polymer microstructure (as has been established for α-olefin polymerization) is still missing. In this work, we reveal the origin of the stereoselective preference for <span>d</span> and <span>l</span>-lactide with two enantiopure salen–Al complexes, which have so far been claimed as the most efficient in enantiomorphic site control, using Density Functional Theory calculations. We introduce active site reorganization and monomer/chain switching throughout the reaction pathway, unconventional aspects necessitating careful consideration when confronting the intricacies associated with chiral catalyst recognition. We show how the catalytic pocket easily rearranges in the reaction path establishing a novel concept of the ligand coordination controlled by monomer binding. The resulting final picture of PLA stereoselectivity is much more complex than that of α-olefin polymerization catalysis, and a “complete” prediction by brute-force is (currently) hard, but the principles evolving should – even in their incomplete form – be useful in the design of new selective catalysts.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/cy/d4cy00937a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205530","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}

引用次数: 0

Aerobic homocoupling of arylboronic acids using Cu-doped amorphous zirconia: impact of catalyst amorphousness on reaction efficiency† 使用掺铜无定形氧化锆进行芳基硼酸的有氧均偶联反应：催化剂无定形性对反应效率的影响

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00694a

引用次数: 0

Coinage (Au, Ag, Cu) metal-catalyzed (3 + 2) annulation of α-aminoketones and electron-deficient alkynes as a route to 3-EWG-substituted pyrroles† 金、银、铜）金属催化的α-氨基酮和缺电子炔的（3 + 2）环化反应，作为制备 3-EWG 取代的吡咯的途径†。

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00660g

引用次数: 0

Tuning catalytic performance of platinum single atoms by choosing the shape of cerium dioxide supports† 通过选择二氧化铈支架的形状来调节铂单原子的催化性能。

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00484a

{"title":"Tuning catalytic performance of platinum single atoms by choosing the shape of cerium dioxide supports†","authors":"","doi":"10.1039/d4cy00484a","DOIUrl":"10.1039/d4cy00484a","url":null,"abstract":"<div><div>The local coordination environment of single atom catalysts (SACs) often determines their catalytic performance. To understand these metal–support interactions, we prepared Pt SACs on cerium dioxide (CeO<sub>2</sub>) cubes, octahedra and rods, with well-structured exposed crystal facets. The CeO<sub>2</sub> crystals were characterized by SEM, TEM, pXRD, and N<sub>2</sub> sorption, confirming the shape-selective synthesis, identical bulk structure, and variations in specific surface area, respectively. EPR, XPS, TEM and XANES measurements showed differences in the oxygen vacancy density following the trend rods > octahedra > cubes. AC-HAADF-STEM, XPS and CO-DRIFTS measurements confirmed the presence of only single Pt<sup>2+</sup> sites, with different surface platinum surface concentrations. We then compared the performance of the three catalysts in ammonia borane hydrolysis. Precise monitoring of reaction kinetics between 30–80 °C gave Arrhenius plots with hundreds of data points. All plots showed a clear inflection point, the temperature of which (rods > octahedra > cubes) correlates to the energy barrier of ammonia borane diffusion to the Pt sites. These activity differences reflect variations in the – facet dependent – degree of stabilization of intermediates by surface oxygen lone pairs and surface–metal binding strength. Our results show how choosing the right macroscopic support shape can give control over single atom catalysed reactions on the microscopic scale.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11322700/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141998941","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}

引用次数: 0

Effect of Pt and Ru-based catalysts on the electrochemical hydrodeoxygenation of phenol to cyclohexane† 铂基和 Ru 基催化剂对苯酚电化学加氢脱氧生成环己烷的影响

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00634h

{"title":"Effect of Pt and Ru-based catalysts on the electrochemical hydrodeoxygenation of phenol to cyclohexane†","authors":"","doi":"10.1039/d4cy00634h","DOIUrl":"10.1039/d4cy00634h","url":null,"abstract":"<div><div>Electrochemical hydrodeoxygenation (EC-HDO) is a promising method for upgrading biomass derived oxygenates into biofuels at near ambient conditions without the need for external hydrogen (H<sub>2</sub>). Although the EC-HDO approach has many advantages over conventional thermochemical hydrodeoxygenation (HDO) methods, the selective production of fully deoxygenated hydrocarbons remains a key challenge. In this study we explore the EC-HDO of phenol as a bio-oil-derived model compound using carbon supported metal electrocatalysts in a custom-made divided electrochemical batch cell. We demonstrated EC-HDO of phenol to cyclohexane and investigated the effect of multiple variables, including catalyst type, and cathodic potential to determine their influence on reaction rate, selectivity, and faradaic efficiency (FE). The results obtained show that lab-synthesized, bi-metallic PtRu–C catalyst results in the highest specific EC-HDO rate of 5.05 mol<sub>cyclohexane</sub> h<sup>−1</sup> g<sub>metal</sub><sup>−1</sup> in comparison to 4.65 mol<sub>cyclohexane</sub> h<sup>−1</sup> g<sub>metal</sub><sup>−1</sup> and 0.35 mol<sub>cyclohexane</sub> h<sup>−1</sup> g<sub>metal</sub><sup>−1</sup>, measured using mono-metallic Pt–C and Ru–C catalysts, respectively. In addition, the labPtRu–C electrocatalyst achieved >30% selectivity towards cyclohexane while the monometallic Pt and Ru only achieved 25 and 11%, respectively. <em>Operando</em> Raman spectroscopy demonstrated strong evidence for ketone reaction intermediates.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/cy/d4cy00634h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936834","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}

引用次数: 0

Efficient glycolysis of used PET bottles into a high-quality valuable monomer using a shape-engineered MnOx nanocatalyst† 利用形状工程 MnOx 纳米催化剂将废旧 PET 瓶高效乙二醇化为高质量的有价单体

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00823e

{"title":"Efficient glycolysis of used PET bottles into a high-quality valuable monomer using a shape-engineered MnOx nanocatalyst†","authors":"","doi":"10.1039/d4cy00823e","DOIUrl":"10.1039/d4cy00823e","url":null,"abstract":"<div><div>The chemical recycling of used polyethylene terephthalate (PET) bottles, a widely used plastic in the modern world, to obtain valuable monomers offers a promising solution to address post-consumer plastic-related environmental concerns. In this study, we have developed an efficient heterogeneous catalytic approach using a shape-engineered manganese oxide (MnO<sub>x</sub>) nanocatalyst with a well-defined rod morphology to facilitate the glycolysis of PET with biomass-derived ethylene glycol to produce a high-quality bis(2-hydroxyethyl) terephthalate (BHET) valuable monomer under mild conditions. The nanorod morphology of the MnO<sub>x</sub> material, specifically the MnO<sub>x</sub> calcined at 500 °C (MnO<sub>x</sub>-500), exhibited remarkable catalytic efficiency in converting used PET bottles into BHET. At a temperature of 180 °C for 3 h, the MnO<sub>x</sub>-500 nanocatalyst achieved a complete conversion of PET with a 86% isolated yield of BHET, surpassing the performance of various metal oxides, such as CeO<sub>2</sub>, TiO<sub>2</sub>, and Nb<sub>2</sub>O<sub>5</sub>. Qualitative analysis of the isolated BHET monomer crystals was conducted using NMR, FT-IR, HR-MS, and powder XRD, along with assessments of thermal stability through TGA and DSC studies. Furthermore, the study demonstrated the catalyst's stability and reusability, suggesting the practical application potential of this methodology. The structure–activity correlation, revealed through comprehensive characterization of the nanostructured MnO<sub>x</sub> materials, highlighted the crucial role of the oxygen vacancy defects and the acidic properties in the MnO<sub>x</sub>-500 nanocatalyst for efficient PET glycolysis to obtain the desired BHET monomer.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205492","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}

引用次数: 0

Efficient reductive amination of 5-hydroxymethylfurfural by iridium-catalysed transfer hydrogenation† 铱催化转移加氢法高效还原胺化 5-羟甲基糠醛

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00812j

引用次数: 0

Facile synthesis of hierarchical nanocrystalline H[Fe,Al]ZSM-5 with boosted lifetime for DTG reactions 轻松合成分层纳米晶 H[Fe,Al]ZSM-5，提高 DTG 反应的寿命

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00838c

{"title":"Facile synthesis of hierarchical nanocrystalline H[Fe,Al]ZSM-5 with boosted lifetime for DTG reactions","authors":"","doi":"10.1039/d4cy00838c","DOIUrl":"10.1039/d4cy00838c","url":null,"abstract":"<div><div>Dimethyl ether to gasoline (DTG) process is an important way to obtain transportation fuels from non-petroleum routes due to the ever-decreasing fossil energy under “dual-carbon” background, and the development of catalyst with long lifetime remains an important challenge. Herein, the hierarchical nanocrystalline H[Fe,Al]ZSM-5 zeolites composed of loosely aggregated nanocrystals were prepared by adding a mesoporous template and prolonging the aging time, and their physicochemical properties and reactivity over the DTG reaction were investigated and compared with that of conventional H[Fe,Al]ZSM-5. The size of individual nanocrystals became smaller and more uniform, and the nanocrystals were loosely aggregated with abundant intercrystal mesopores, resulting in the significant enhancement of catalyst lifetime. Furthermore, the acid intensity of hierarchical nanocrystalline zeolites weakened, and the strong acid amount was reduced. DTG reaction results illustrated that the hierarchical nanocrystalline zeolite of Mes-ZSM-5 using a mesoporous template exhibited the longest lifetime (182 h) with 100% DME conversion, and gasoline yield remained more than 70%. Moreover, the C<sub>5</sub><sup>+</sup> selectivity was up to 76.6%; meanwhile, the contents of aromatics, benzene and durene were as low as 40%, 0.6% and 1.7%, respectively. The obtained gasoline product had a higher RON (research octane numbers).</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329360","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}

引用次数: 0

Scalable and green juglone synthesis via heterogeneous photocatalysis in a photomicroreactor† 在光微反应器中通过异相光催化技术合成可扩展的绿色朱格拉酮†。

IF 4.4 3区化学

Catalysis Science & Technology Pub Date : 2024-09-30 DOI: 10.1039/d4cy00778f

{"title":"Scalable and green juglone synthesis via heterogeneous photocatalysis in a photomicroreactor†","authors":"","doi":"10.1039/d4cy00778f","DOIUrl":"10.1039/d4cy00778f","url":null,"abstract":"<div><div>The selection of green and scalable heterogeneous photocatalysis is always a great dilemma for the chemistry and chemical engineering communities. In this report, we resolved this vital conundrum by synergistically examining the scalability and green potential of heterogeneous photocatalysis for juglone synthesis. We scaled up juglone productivity and the space–time yield to 15 g per day and 43.87 g L<sup>−1</sup> h<sup>−1</sup>, respectively, <em>via</em> heterogeneous photocatalysis with a high-power LED as a light source and Amb–<em>m</em>-TcPP as a photocatalyst, which was fabricated by incorporating <em>meso</em>-tetracarboxyphenylporphyrine (<em>m</em>-TcPP) over the polystyrene ion-exchange resin Amberlyst-15. Amb–<em>m</em>-TcPP showed excellent recyclability in multiple cycles and exhibited high photostability for 12 h continuous operation without <em>m</em>-TcPP leaching with a turnover frequency of 409.7 h<sup>−1</sup>. The apparent rate constants were higher than those in previously employed heterogeneous photocatalysis, and intrinsic rate constants of intermediate steps were evaluated using transition state theory with quantum mechanical models using DFT simulations, which was useful for gaining mechanistic insights into this photooxidation process. Finally, heterogeneous DHN photooxidation was confirmed to be well aligned with green chemistry principles, and <em>E</em> factors were found to be under an acceptable range. Thus, this heterogeneous DHN photooxidation can be regarded as a green and sustainable synthesis route for multigram juglone production.</div></div>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":4.4,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142329380","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}

引用次数: 0