Catalysis Letters最新文献

{"title":"Analysis of Deactivation Causes and Regeneration Study of RuO2 /TiO2 in Industrial Catalytic Wet Oxidation Process","authors":"Tong Cui,&nbsp;Wenjing Sun,&nbsp;Danyang Yu,&nbsp;Weiling Piao,&nbsp;Huangzhao Wei,&nbsp;Xu Yang,&nbsp;Chenglin Sun","doi":"10.1007/s10562-024-04915-4","DOIUrl":"10.1007/s10562-024-04915-4","url":null,"abstract":"<div><p>RuO₂ /TiO₂, as the main catalyst in wet catalytic oxidation, faces the problem of catalyst deactivation while treating high concentration organic wastewater efficiently and without pollution. There have been many studies on catalyst deactivation and regeneration, but most of them are based on laboratory simulation environment. Due to the complexity of industrial environments, the causes of industrial catalyst deactivation are still unclear, while there are very few studies on regeneration. Herein, we characterized industrially used catalysts and found that the causes of catalyst deactivation can be attributed to two reasons, namely, the change of carrier crystal shape and carbon accumulation. Thermal regeneration to address the carbon accumulation problem restores some of the physicochemical properties of the used catalysts, however, thermal regeneration cannot restore the catalyst support phase from rutile back to anatase, resulting in the inability to restore catalyst activity. Therefore, the catalyst was regenerated by the method of direct addition of active components, and the catalyst activity was basically restored when the Ru mass fraction was 0.5%. Moreover, the method of directly adding active components has the advantages of simplicity and no energy consumption, which is easy to be utilized in the industrial production process.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Manganese Ferrite Supported on Activated Alumina Beads for Activation of Periodate Towards Efficient Degradation of Organic Dye Pollutants","authors":"Yawei Shi,&nbsp;Chang Ma,&nbsp;Yumei Xing,&nbsp;Ya Sun,&nbsp;Guanghui Ding","doi":"10.1007/s10562-024-04919-0","DOIUrl":"10.1007/s10562-024-04919-0","url":null,"abstract":"<div><p>Manganese ferrite (MnFe₂O₄) supported on activated alumina beads (MFO-AABs) was synthesized by solvothermal method and used to activate periodate (PI) to degrade crystal violet (CV) and other organic dye pollutants. Under the optimum conditions (MFO-AABs dosage of 10 beads and PI dosage of 0.4 g/L), the removal efficiency of 10 mg/L CV reached 98.3% in 120 min. This surpassed the sum of removal efficiencies when MFO-AABs and PI presented respectively, indicating that MFO-AABs and PI worked synergistically. The removal efficiency of CV was almost unaffected in the presence of SO₄²⁻(aq.) while slightly inhibited by Cl⁻(aq.), HCO₃⁻(aq.) or HPO₄²⁻(aq.). The effect of initial pH was studied in the range of 3–9, showing that the removal performance of CV was better under acidic and neutral conditions. Reusability tests showed that the removal efficiency of CV declined slightly after MFO-AABs was reused for 4 times, which was attributed to the accumulation of degradation products on the catalyst. Through calcination to remove these adsorbed degradation products, the catalytic ability could be recovered. Quenching experiments showed that ¹O₂ played a major role in the reaction process. The contribution of non-radical electron transfer was ruled out by a series of electrochemical tests. In addition, IO₄⁻(aq.) was stoichiometrically converted to IO₃⁻(aq.) without producing potentially toxic iodine species such as I⁻(aq.), I₂/I₃⁻(aq.) and HOI. Combining liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) calculations, the possible degradation pathway of CV was proposed with 12 degradation products. Finally, the analysis of potential toxicity was carried out by theoretical calculations as well as experiments with <i>Vigna radiata</i>, revealing the decreased potential toxicity after the degradation process.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995298","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ascorbic Acid Enhanced the Performance of Pd/ZrO2 for Efficient Hydrogenation of Phenol in Aqueous Phase","authors":"Yu Wang,&nbsp;Xin Zhang,&nbsp;Shiling Fan,&nbsp;Zhiying Wang,&nbsp;Hao Li","doi":"10.1007/s10562-024-04917-2","DOIUrl":"10.1007/s10562-024-04917-2","url":null,"abstract":"<div><p>The design of high-performance, mild-condition HDO catalysts is a crucial step in the high-value utilization of the conversion of phenol to cyclohexanone. In this paper, the effect of modifier on the catalyst activity was investigated by surface modification of ZrO₂ support by ascorbic acid (AA). The role of water in the reaction solvent was also explored. The results showed that ascorbic acid can etch the surface lattice of the support and generate reactive oxygen vacancies; the OH group can act as an acid site and stabilise the C = O group in cyclohexanone through “acid-base interaction”, thus inhibiting further hydrogenation of cyclohexanone. In addition, the transfer of hydrogen in the aqueous phase facilitated the isomerisation of the enol to cyclohexanone and inhibited the occurrence of side reactions. The Pd/ZrO₂ + AA catalyst resulted in a phenol conversion of 58.3% and a cyclohexanone selectivity of 85.7% in 2 h at a water/methanol volume ratio of 2/8. Moreover, the catalyst showed good stability, with no significant decrease in phenol conversion and the selectivity of cyclohexanone remaining at 80.6% after four cycles. This study aimed to provide a new avenue for the high-value utilization of phenol by modulating the catalyst preparation and optimising the reaction system.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DFT Study on S-Scheme g-C3N4/g-C3N4(P) Heterostructure Photocatalyst in Hydrogen Production Process by Photocatalytic Water Splitting","authors":"Houmei Dai,&nbsp;Xin Li,&nbsp;Yanglai Hou,&nbsp;Dongliang Wang,&nbsp;Ran Wei","doi":"10.1007/s10562-024-04929-y","DOIUrl":"10.1007/s10562-024-04929-y","url":null,"abstract":"<div><p>The recombination of electrons and holes in the semiconductor photocatalyst seriously affects the hydrogen production efficiency in photocatalytic water splitting. The appearance of S-scheme heterojunction can greatly reduce the recombination rate. In order to enrich this type of photocatalyst, the performance of metal-free g-C₃N₄/g-C₃N₄(P) heterostructure is studied theoretically. The negative adhesion energy proves the stability of the heterostructure. Research on PDOS, projected band structures, charge transfer, band edge positions and photocatalytic mechanism shows more clearly and comprehensively that this g-C₃N₄/g-C₃N₄(P) heterostructure is S-scheme with high redox ability. The near-zero ∆G_H* of free energy change in HER process indicates that this g-C₃N₄/g-C₃N₄(P) heterostructure should have good HER performance. This work enriches the photocatalyst types and provides a theoretical support for the experimental study of corresponding photocatalysts.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ethanol-Based Transesterification of Rapeseed Oil with CaO Catalyst: Process Optimization and Validation Using Microalgal Lipids","authors":"Gabriela F. Ferreira,&nbsp;Luisa F. Ríos Pinto,&nbsp;Rubens Maciel Filho,&nbsp;Leonardo V. Fregolente,&nbsp;James Hayward,&nbsp;Jonathan K. Bartley","doi":"10.1007/s10562-024-04921-6","DOIUrl":"10.1007/s10562-024-04921-6","url":null,"abstract":"<div><p>Microalgal oil has been increasingly studied as a feedstock for biodiesel production through transesterification reactions using heterogeneous catalysts. This route offers several benefits, including catalyst reuse, ease of separation, and improved safety, while addressing environmental and technical issues associated with using homogeneous acids and bases. Most studies use methanol for the transesterification, and few studies have investigated the transesterification of microalgal oil using ethanol. Beyond the environmental benefits of microalgae compared to plant-based biomass, replacing methanol with bioethanol is advantageous due to its lower cost and reduced toxicity. If the emulsion issue between the produced biodiesel and ethanol is resolved, ethanol could be a more environmentally friendly alternative for green fuel production. This study evaluated various metal oxides as catalysts for the transesterification of rapeseed oil using ethanol as both reagent and solvent to improve miscibility. From catalyst screening, CaO showed the highest fatty acid ethyl esters yield and this catalyst was then tested at different reaction times in two systems (round-bottom flask and autoclave reactor) for the transesterification of both rapeseed and microalgal (<i>Scenedesmus</i> sp.) oil. The highest reaction yield was 86.0% for rapeseed oil and 81.3% for microalgal oil using 114:1 ethanol: oil molar ratio with CaO in an autoclave reactor. This work addresses the limited studies on ethanol in microalgal oil transesterification, demonstrating the effectiveness of CaO as a catalyst. It highlights the potential of ethanol as a greener, cost-effective alternative to methanol for biodiesel production.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-024-04921-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design, Synthesis, Characterization and Catalytic Activity of Chromium Oxide Nanoparticles Immobilized on Layered Double Hydroxide as Competent Nanocatalyst","authors":"Jagat Singh Kirar","doi":"10.1007/s10562-024-04926-1","DOIUrl":"10.1007/s10562-024-04926-1","url":null,"abstract":"<div><p>Transition metals are commonly used in the oxidation of cyclohexane, but their harsh reaction conditions and lack of efficiency make further use challenging. In this study, we prepared chromium nanoparticles supported on layered double hydroxide abbreviated as Cr₂O₃/LDH. The physiochemical properties of synthesized nanocatalysts were extensively studied using FTIR, XRD, SEM, EDX, TEM, ICP-AES, and XPS technique. The synthesized Cr₂O₃/LDH nanocatalyst was used to the liquid phase selective oxidation of cyclohexane under solvent-free condition. The characterization result indicates that the Cr₂O₃-NPs were uniformly dispersed on the surface of LDH. The Cr₂O₃-NPs alone have relatively low catalytic activity, while LDH has no catalytic activity. However, the Cr₂O₃-NPs/LDH hybrid significantly increases both the conversion and selectivity. A maximum conversion of 34.73% cyclohexane and 97.85% selectivity to KA oil obtained over the Cr₂O₃/LDH nanocatalyst. Furthermore, the leaching test showed that the Cr₂O₃/LDH nanocatalyst was heterogeneous and could be recycled at least six cycles without significant loss in catalytic efficiency.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"FeOOH-NiV LDH Heterostructure as Efficient Electrocatalyst for Oxygen Evolution Reaction","authors":"Shengwang Liu,&nbsp;Shixue Song,&nbsp;Yi Feng","doi":"10.1007/s10562-024-04894-6","DOIUrl":"10.1007/s10562-024-04894-6","url":null,"abstract":"<div><p>The oxygen evolution reaction (OER) with complex 4-electron transfer is a critical issue limiting the efficiency of electrolytic hydrogen production. Therefore, to develop efficient OER electrocatalysts for water splitting was necessary. Given the abundant unoccupied 3d orbitals of high-valent vanadium ions and the three-dimensional structure of nickel foam substrates, this study successfully fabricate hydroxy-iron oxide (FeOOH) modified nickel vanadium layered double hydroxide (NiV LDH) nanosheets array heterostructure electrocatalysts through surface modification method. By coupling FeOOH with NiV LDH, the electron structure between Fe, Ni, V, and O was finely regulated. Thanks to the strong electronic interactions at the heterostructure interface, the prepared heterostructure electrocatalysts exhibit outstanding electrocatalytic OER performance in 1 M KOH electrolyte. The heterostructure electrocatalyst demonstrated overpotentials of only 212, 252, and 279 mV at current densities of 10, 50, and 100 mA·cm⁻², respectively, and a Tafel slope of only 71.37 mV·dec⁻¹. This study provided a new strategy for developing efficient new OER heterostructure catalysts.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995305","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoelectrochemical and Catalytic Hydrogen Generation from Hydrolysis of NaBH4 using Ruthenium and Platinum Decorated ZnO/TiO2 Heterojunction Thin Film Electrodes","authors":"Cigdem Tuc Altaf,&nbsp;Tuluhan O. Colak,&nbsp;Valentina G. Minkina,&nbsp;Stanislav I. Shabunya,&nbsp;Mehmet Sankir,&nbsp;Nurdan Demirci Sankir,&nbsp;Vladimir I. Kalinin","doi":"10.1007/s10562-024-04930-5","DOIUrl":"10.1007/s10562-024-04930-5","url":null,"abstract":"<div><p>In this study, the use of ruthenium (Ru) and platinum (Pt)-decorated zinc oxide-titanium oxide (ZnO/TiO₂) nanostructured catalysts for catalytic and photoelectrochemical (PEC) sodium borohydride (NaBH₄) hydrolysis for hydrogen production was investigated. Catalytic studies of ZnO/TiO₂/Ru-Pt electrodes conducted under dark conditions have shown that the hydrolysis process does not depend on the structure of the catalyst. In contrast to the dark catalytic measurements, it was found that the morphology of the nanocatalyst and the metal used to sensitize the nanocatalyst affected the PEC performance. From the BET analysis, ZnO nano-flower (NF) structures have a surface area of 80 m²g⁻¹, while the surface area of nanosheet (NS) structures is calculated as 17 m²g⁻¹. In parallel with their high surface area, ZnO NF structures were found to have higher optical absorption in the UV and visible region than NS structures. However, the high photosensitivity of NS structures compared to the NF enabled them to exhibit very good PEC performance, especially at high NaBH₄ concentrations. In this study, the highest applied bias photoconversion efficiency was observed in ZnO NS/TiO₂/Ru catalysts with 9.0%. This very high efficiency indicates the enormous potential of this catalyst for next-generation green hydrogen production.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduction of the Hydrogen Content of CO2 Methanation Product Gas via Catalytic Ethanol Dehydration–Hydrogenation","authors":"Shimpei Norioka,&nbsp;Tomoki Uchiyama,&nbsp;Hirofumi Ohtsuka,&nbsp;Yoshiharu Uchimoto","doi":"10.1007/s10562-024-04924-3","DOIUrl":"10.1007/s10562-024-04924-3","url":null,"abstract":"<div><p>Methanation, the process of producing methane from CO₂ and hydrogen via renewable energy sources, has attracted considerable attention. However, reducing the hydrogen content in the product methane gas remains a challenge for using this product gas as a city gas. To overcome this challenge, this study investigated the ethanol dehydration–hydrogenation reaction (C₂H₅OH + H₂ → C₂H₆ + H₂O) using ethanol, which is widely used as a biofuel, and hydrogen in the product methane gas. The reactions were performed under practical conditions using Pd and solid acid catalysts. It was confirmed that ethanol could be converted to ethane in high yields while the hydrogen content is reduced in the methane-rich gas. This study demonstrates the practical applicability of the ethanol dehydration-hydrogenation reaction to the methanation process to generate city gas.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced Photocatalytic Hydrogen Evolution Properties of Er-Doped ZnIn2S4 Nanostructures via Hydrothermal Synthesis","authors":"Muhammad Shoaib,&nbsp;Fen Qiao,&nbsp;Qingan Sun,&nbsp;Jikang Zhao","doi":"10.1007/s10562-024-04927-0","DOIUrl":"10.1007/s10562-024-04927-0","url":null,"abstract":"<div><p>The utilization of ZnIn₂S₄ in photocatalytic hydrogen applications has garnered immense interest due to its promising features encompassing non-toxic nature, suitable band gap, and robust stability. However, the performance of ZnIn₂S₄ remains constrained by its limited absorption range and swift charge recombination. In this context, doping with rare earth metals has emerged as a potential strategy to enhance photocatalytic efficiency, yet this approach remains understudied. Herein, we report the synthesis of Er-doped ZnIn₂S₄ nanostructures utilizing a hydrothermal method, followed by structural characterization and HER evaluations. The XRD analysis confirms the primarily hexagonal crystal structure of ZnIn₂S₄. Notably, an optimal Er concentration of 70% exhibits enhanced hydrogen production efficiency. This improvement is attributed to the efficient charge transfer facilitated by Er doping, as evidenced by the photocurrent and Nyquist plots of ZnIn₂S₄. Moreover, the introduction of new energy levels by Er in the band gap enhances the light harvesting capability of ZnIn₂S₄. Furthermore, SEM studies reveal that Er doping influences the crystal growth rate of the material.</p><h3>Graphical Abstract</h3><p>The Er doped ZnIn₂S₄ photocatalyst were prepared through hydrothermal methods. The Er ions doping reduce the band gap of ZnIn₂S₄ by introducing the new energy levels in the band gap. The reduction of band gap enhances the absorption efficiency and also enhance the number of photogenerated charge carries, which results in enhanced the hydrogen evolution performance.</p>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 2","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}