Catalysis Science & Technology最新文献

{"title":"Restructuring of Ag catalysts for methanol to formaldehyde conversion studied using in situ X-ray ptychography and electron microscopy","authors":"Srashtasrita Das, Maik Kahnt, Youri van Valen, Tina Bergh, Sara Blomberg, Mikhail Lyubomirskiy, Christian G. Schroer, Hilde J. Venvik, Thomas L. Sheppard","doi":"10.1039/d4cy00770k","DOIUrl":"https://doi.org/10.1039/d4cy00770k","url":null,"abstract":"Dynamic restructuring of silver catalysts during the industrial conversion of methanol to formaldehyde leads to surface faceting and pinhole formation. Subsequent sintering under reaction conditions, followed by increased pressure drop and decreased catalyst activity requires catalyst bed replacement after several months of operation. This necessitates a comprehensive understanding of the bulk catalyst restructuring under exposure to different gas environments. In this work, Ag restructuring was studied at elevated temperatures under different reactive and inert gas environments. Bubble formation within catalysts of 5–8 μm thickness was visualized in real-time using <em>in situ</em> X-ray ptychography. Stepwise heating up to 650 °C in combination with imaging was used to determine the effect of temperature on silver restructuring. Dynamic changes within the catalyst were further quantified in terms of relative changes in mass on selected regions at a constant temperature of 500 °C. Quantitative assessment of dynamic changes in the catalyst resulting from bubble growth and movement revealed the influence of temperature, time, and gas environment on the degree of restructuring. Post-mortem scanning electron microscopy with energy-dispersive X-ray spectroscopy mapping confirmed the redistribution of material as a consequence of bubble rupture and collapse. The formation of pores and cavities under different gas environments was additionally confirmed using a fixed bed reactor, and subsequent examination using focused-ion beam milling, providing detailed analysis of the surface structure. This study demonstrates the unique advantage of correlative hard X-ray and electron microscopy for quantitative morphological studies of industrial catalysts.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226331","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":"Insights into the photocatalytic mechanism of g-C3N4/Cs2BBr6 (B = Pt, Sn, Ti) heterojunction photocatalysts by density functional theory calculations","authors":"Xinyu Ye, Yuanmiao Sun, Anmin Liu, Shizheng Wen, Tingli Ma","doi":"10.1039/d4cy00387j","DOIUrl":"https://doi.org/10.1039/d4cy00387j","url":null,"abstract":"Among all well-studied photocatalysts, g-C<small>₃</small>N<small>₄</small> has attracted significant research interest in various fields. However, the recombination rate of photogenerated electron–hole pairs in unmodified g-C<small>₃</small>N<small>₄</small> is high, leading to a decrease in photocatalytic efficiency. In practical applications, it is often necessary to introduce appropriate amounts and types of surface cocatalysts to amplify the photocatalytic activity of g-C<small>₃</small>N<small>₄</small>. The heterojunctions between g-C<small>₃</small>N<small>₄</small> and perovskite materials can facilitate efficient charge separation, leading to improved photocatalytic performance while maintaining the stability of the photocatalyst. In recent years, lead-free halide double perovskites, such as A<small>₂</small>BX<small>₆</small>, have been widely applied in the field of photocatalysis. In this study, we conducted systematic investigations on the band structures and charge transfer of g-C<small>₃</small>N<small>₄</small>/Cs<small>₂</small>BBr<small>₆</small> (B = Pt, Sn, Ti) heterojunctions using density functional theory (DFT) calculations, and explored the interaction between the Cs<small>₂</small>BBr<small>₆</small>(001) surface and the g-C<small>₃</small>N<small>₄</small>. The results show that the g-C<small>₃</small>N<small>₄</small>/Cs<small>₂</small>PtBr<small>₆</small> as well as g-C<small>₃</small>N<small>₄</small>/Cs<small>₂</small>SnBr<small>₆</small> heterojunctions exhibit staggered band alignment, which facilitates the migration of photogenerated charge carriers and enhances catalytic activity. Besides, the g-C<small>₃</small>N<small>₄</small>/Cs<small>₂</small>TiBr<small>₆</small> heterojunction exhibited a straddling gap. Furthermore, the analysis of density of states, charge density differences, and Bader charges reveals that the presence of an internal electric field promotes the partition of electron–hole pairs at the heterojunction interface, effectively suppressing the recombination of charge carriers. Therefore, depending on the specific metal ions at the B site in the g-C<small>₃</small>N<small>₄</small>/Cs<small>₂</small>BBr<small>₆</small> structure, the resulting heterojunctions will exhibit different band alignments and photocatalytic performances. This work contributes to providing theoretical insights for the design of novel high activity heterojunction photocatalysts.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226333","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":"Superior catalytic combustion of methane over Pd supported on oxygen vacancy-rich NiAl2O4","authors":"Sha Li, Jie Li, Zirui He, Yao Sheng, Wen Liu","doi":"10.1039/d4cy00620h","DOIUrl":"https://doi.org/10.1039/d4cy00620h","url":null,"abstract":"Catalytic combustion of methane is an effective solution to reducing the greenhouse gas emission from natural gas-fueled engines. However, existing methane combustion catalysts suffer from insufficient low-temperature activity and poor hydrothermal stability. In this study, we demonstrate that PdO nanoparticles supported on oxygen vacancy-rich NiAl<small>₂</small>O<small>₄</small> spinel, prepared by a simple and affordable procedure, render a remarkable enhancement in catalytic methane combustion below 400 °C. The calcination temperature was used as a robust means to tune the concentration of oxygen vacancies in the NiAl<small>₂</small>O<small>₄</small> spinel. The particle size of PdO can be effectively controlled by adjusting the temperature of the subsequent calcination of the Pd-loaded spinel catalyst. The optimized catalyst, Pd/NiAl<small>₂</small>O<small>₄</small>-900–550, <em>i.e.</em> NiAl<small>₂</small>O<small>₄</small> calcined at 900 °C, impregnated with Pd, and subsequently calcined at 550 °C, achieved a <em>T</em><small>₅₀</small> as low as 325 °C, whilst exhibiting excellent stability. After continuous treatment in 10% H<small>₂</small>O at 750 °C for 10 h, <em>T</em><small>₅₀</small> remains at below 396 °C. The characterization of the catalyst before, after and <em>in situ</em> methane combustion confirms that the high oxygen vacancy concentration and stable PdO nanoparticles both contribute to its excellent activity and stability. The present study introduces a new paradigm for preparing cost-effective and scalable redox catalysts supported on NiAl<small>₂</small>O<small>₄</small> spinel with rich and tunable oxygen vacancies.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226332","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":"Fabrication of a direct Z-scheme heterojunction of UiO-66-NH2 and tubular g-C3N4 for the stable photocatalytic reduction of CO2 to CO and CH4","authors":"Hongyang Liu, Yang Yang, Chaojun Guo, Yonghua Zhou","doi":"10.1039/d4cy00790e","DOIUrl":"https://doi.org/10.1039/d4cy00790e","url":null,"abstract":"The conversion of CO<small>₂</small> into high-value fuels and industrial chemicals using solar energy has always been a popular research topic, and the development of highly active and stable photocatalysts is the key. In the present work, a direct Z-scheme heterojunction composite of tubular g-C<small>₃</small>N<small>₄</small>(TCN) and amino-functionalized UiO-66(UNH) were synthesized by solvothermal method. XRD, SEM and XPS showed that UNH grew <em>in situ</em> on the surface of the tubular structure of TCN and there was a close interaction <em>via</em> “–CO–NH–” covalent bonding between them. Photocatalytic CO<small>₂</small> reduction experiments exhibited that the composite T/U-0.65 possessed the optimal catalytic performance, with CH<small>₄</small> yields 14.85 times and 3 times higher than those of pure TCN and pure UNH, respectively. In addition, T/U-0.65 had excellent cycle stability, maintaining a CH<small>₄</small> yield of 89.25% through the 8th cycle. Photoelectrochemical characterization and ESR radical trapping experiments further demonstrated that the heterojunction composition was conducive to the photocatalytic reduction of CO<small>₂</small> activity.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205468","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":"Nickel–PNN catalysed sustainable synthesis of polysubstituted quinolines under microwave irradiation","authors":"Manali A. Mohite, Sonu Sheokand, Maravanji S. Balakrishna","doi":"10.1039/d4cy00863d","DOIUrl":"https://doi.org/10.1039/d4cy00863d","url":null,"abstract":"In this manuscript, the synthesis of a series of cationic Ni<small>^II</small> complexes based on mixed donor triazolyl-pyridine-based aminophosphine, [(NiCl){<small>^R′</small>P<small>^R</small>NN}-κ<small>³</small>-P,N,N]OTf (R = H or Me; R′ = Ph or <small>^<em>t</em></small>Bu), is described. The neutral dearomatized complexes [(NiCl){<small>^R′</small>PNN}-κ<small>³</small>-P,N,N] (R′ = Ph or <small>^<em>t</em></small>Bu) were prepared by deprotonation of [(NiCl){P<small>^Ph</small>N(H)N}-κ<small>³</small>-P,N,N]OTf (<strong>Ni1</strong>) and [(NiCl){(<small>^<em>t</em></small>Bu<small>₂</small>P)N(H)N}-κ<small>³</small>-P,N,N]OTf (<strong>Ni3</strong>) with 1 equiv. of <small>^<em>t</em></small>BuOK. These complexes (0.5 mol%) were employed for the synthesis of substituted quinolines at 110 °C under microwave irradiation with 20 mol% of KOH. Among these, complexes [(NiCl){<small>^<em>t</em>Bu</small>P<small>^H</small>NN-κ<small>³</small>-P,N,N}]OTf (<strong>Ni3</strong>) and [(NiCl){<small>^<em>t</em>Bu</small>PNN}-κ<small>³</small>-P,N,N] (<strong>Ni5</strong>) were found to be highly efficient. A wide range of derivatives, including aryl, aliphatic, acyclic ketones, primary alcohols and aminobenzyl alcohols, yielded the corresponding quinolines in good to excellent yields (62 examples). A series of control experiments were carried out to establish the reaction mechanism. HR-MS spectral studies were investigated to characterize the nickel-hydride intermediate. Mechanistic studies confirmed that the reaction takes an acceptorless dehydrogenative coupling pathway.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205494","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":"Efficient glycolysis of used PET bottles into a high-quality valuable monomer using a shape-engineered MnOx nanocatalyst","authors":"Bhattu Swapna, Nittan Singh, Suranjana Patowary, Pankaj Bharali, Giridhar Madras, Putla Sudarsanam","doi":"10.1039/d4cy00823e","DOIUrl":"https://doi.org/10.1039/d4cy00823e","url":null,"abstract":"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<small>_<em>x</em></small>) 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<small>_<em>x</em></small> material, specifically the MnO<small>_<em>x</em></small> calcined at 500 °C (MnO<small>_<em>x</em></small>-500), exhibited remarkable catalytic efficiency in converting used PET bottles into BHET. At a temperature of 180 °C for 3 h, the MnO<small>_<em>x</em></small>-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<small>₂</small>, TiO<small>₂</small>, and Nb<small>₂</small>O<small>₅</small>. 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<small>_<em>x</em></small> materials, highlighted the crucial role of the oxygen vacancy defects and the acidic properties in the MnO<small>_<em>x</em></small>-500 nanocatalyst for efficient PET glycolysis to obtain the desired BHET monomer.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","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}

{"title":"Ni-loaded Co-NC catalysts for promoting electrocatalytic nitrate reduction to ammonia","authors":"Fang Zhao, Yidi Liu, Chengjie Li, Zhen Yuan, Qianqian Hua, Liguo Gao, Xuefeng Ren, Peixia Yang, Anmin Liu","doi":"10.1039/d4cy00942h","DOIUrl":"https://doi.org/10.1039/d4cy00942h","url":null,"abstract":"The Haber–Bosch process, the traditional method of ammonia synthesis, uses hydrogen derived from steam reforming of hydrocarbons; and involves harsh operating conditions of high temperatures (300–600 °C) and pressures (200–400 atm), expending a vast amount of energy each year. Recently, there has been a lot of interest in the electrochemical nitrogen reduction process (NRR) to NH<small>₃</small>, which is inspired by natural microbial nitrogen fixation. However, the stable N<img alt=\"[triple bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e002.gif\">N violent hydrogen evolution reaction hindered the development of the NRR. In comparison, the electrocatalytic nitrate reduction reaction (NO<small>₃</small>RR) has significant advantages. The much lower dissociation energy of N<img alt=\"[double bond, length as m-dash]\" border=\"0\" src=\"https://www.rsc.org/images/entities/char_e001.gif\">O (204 kJ mol<small>⁻¹</small>) is required; nitrate is widespread in surface water. Herein, an electrocatalyst loaded with Ni onto CoZn@ZIF by a simple impregnation method is reported, which possesses a nitrogen-doped graphitic carbon structure after pyrolytic carbonization. Detailed experiments showed that the NiCo-NC catalyst significantly accelerated the NO<small>₃</small>RR compared to Co-NC. NiCo-NC exhibited remarkable NO<small>₃</small>RR activity. At −0.6 V and −1.1 V, ammonia yields of 5.01 mg cm<small>⁻²</small> h<small>⁻¹</small> and 10.12 mg cm<small>⁻²</small> h<small>⁻¹</small> were obtained, with FEs reaching 92.75% and 96.65%, respectively. The catalyst showed excellent electrochemical stability in 24-hour electrolysis experiments and five-cycle stability tests. Meanwhile, <small>¹⁵</small>N isotope labeling experiments further verified the source of N in NH<small>₄</small><small>⁺</small> from NO<small>₃</small><small>⁻</small>.</img></img>","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205493","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":"Carbon-supported Zn-HPW ligand catalysts for acetylene hydration","authors":"Zhen Chen, Dingjie Luo, Qinqin Wang, Long Zhou, Yufan Ma, Fangjie Lu, Bin Dai","doi":"10.1039/d4cy00806e","DOIUrl":"https://doi.org/10.1039/d4cy00806e","url":null,"abstract":"In recent years, the production of acetaldehyde with rich raw materials still has high research value. A series of Zn-HPW/AC catalysts with a Zn–O<small>₄</small> configuration were prepared to solve the problems of easy loss of active components and carbon accumulation of Zn-based catalysts in the reaction. The characterization results showed that the phosphotungstic acid (HPW) ligands effectively promoted Zn species dispersion, provided more acid sites, mitigated the loss of Zn, and improved the carbon deposition resistance of the catalyst. The density functional theory (DFT) calculation further confirmed that the water molecules preferentially adsorb on the surface of the catalyst to promote the dissociation of water molecules, and the H of dissociation from water molecules and Zn forms the most stable Zn–OH configuration, which is the main active center of the reaction. Meanwhile the –OH dissociated from water molecules is adducted with C<small>₂</small>H<small>₂</small>, while H reduces the catalyst, and the original H atoms in the ligand catalyst further participate in the reaction to realize the catalytic cycle. This provides a new idea for the development of green catalysts for acetylene hydration.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205498","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":"High-pressure in situ X-ray absorption fine structure measurements for hydrogenation of CO2 to methanol over Zn-doped ZrO2","authors":"Shohei Tada, Kazumasa Oshima, Tastuya Joutsuka, Masahiko Nishijima, Ryuji Kikuchi, Tetsuo Honma","doi":"10.1039/d4cy00894d","DOIUrl":"https://doi.org/10.1039/d4cy00894d","url":null,"abstract":"Obtaining insights into the active-site structure of a catalyst during high-pressure and high-temperature catalytic reactions is extremely challenging. In this study, changes in the coordination structure of Zn species in Zn-doped ZrO<small>₂</small> catalysts (Zn/(Zn + Zr) atomic ratio = 9%) during CO<small>₂</small>-to-methanol hydrogenation (cell temperature = 400 °C, pressure = 9 bars) was investigated using high-pressure <em>in situ</em> X-ray absorption fine structure measurements and density functional theory calculations. The formation of Zn–H species, which are considered the active sites for the reaction, was very limited, with most Zn species existing as [ZnO<small>_<em>a</em></small>] isolated clusters. Additionally, the adsorption of CO<small>₂</small> at the Zr<small>⁴⁺</small> sites near the Zn species induced significant distortions in the coordination structure of the Zn species. This study provides new insights into the catalytic active-site structure.","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142205471","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":"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":"https://doi.org/10.1039/d4cy00598h","url":null,"abstract":"CuS/MoS<small>₂</small> heterojunctions were fabricated by a facile one-step hydrothermal method and evaluated <em>via</em> the photoreduction of Cr(<small>VI</small>) under visible light irradiation. The CuS/MoS<small>₂</small> heterojunctions demonstrated a hierarchical porous structure, self-assembled from intersecting thin nanosheets, which resulted in a flower-like morphology. The optimized CuS/MoS<small>₂</small> heterojunction (CuS/MoS<small>₂</small>-4.6) exhibited superior photocatalytic performance toward the removal of Cr(<small>VI</small>) under visible light with a <em>k</em> value of 1.33 × 10<small>⁻²</small> min<small>⁻¹</small>, which was much higher than that of pure CuS (2.13 × 10<small>⁻⁴</small> min<small>⁻¹</small>) and MoS<small>₂</small> (4.39 × 10<small>⁻⁴</small> min<small>⁻¹</small>). The enhanced Cr(<small>VI</small>) photoreduction performance was ascribed to the construction of a type II CuS/MoS<small>₂</small> heterojunction, in which electrons in the conduction band (CB) of CuS were transferred to the CB of MoS<small>₂</small> due to the favorable band alignment, while holes in the valence band (VB) of MoS<small>₂</small> 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(<small>VI</small>).","PeriodicalId":66,"journal":{"name":"Catalysis Science & Technology","volume":null,"pages":null},"PeriodicalIF":5.0,"publicationDate":"2024-08-20","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}