Catalysis Today最新文献

{"title":"Non-thermal plasma/ photocatalysis processes for dimethyl disulfide removal: Study and reduction of the catalyst poisoning","authors":"Nacer Belkessa ,&nbsp;Amine Aymen Assadi ,&nbsp;Phuong Nguyen Tri ,&nbsp;Abdelkrim Bouzaza","doi":"10.1016/j.cattod.2025.115380","DOIUrl":"10.1016/j.cattod.2025.115380","url":null,"abstract":"<div><div>In this paper, the removal of gaseous dimethyl disulfide (DMDS) was performed by two oxidation processes: photocatalysis over TiO₂ supported on glass fiber tissue and in dielectric barrier discharge (DBD) plasma. A catalyst deactivation was confirmed when the photocatalysis was taken alone, and several regeneration procedures were conducted. Firstly, photocatalytic removal efficiency was followed at three different DMDS initial concentrations. Catalyst deactivation has started quickly and the removal efficiency reach a low plateau at 19.68 %, 22 % and 10 % for an initial concentration of 22, 45 and 60 mg.m⁻³, respectively. The FT-IR and XPS analysis, performed on the deactivated catalyst indicated the presence of partial oxidation products such as sulfonates, sulfates and sulfonic acids groups. In the plasma process alone, the effect of initial concentration and plasma energy (10–41 J.L⁻¹) were explored toward DMDS elimination and 89.60 % of degraded DMDS was achieved at 41 J.L⁻¹. In the second part, the catalyst regeneration was investigated. It was demonstrated that DBD coupled with UVA was an efficient method to recover the full catalyst performance due to the action of ozone decomposition and valorization in the regeneration process. An additional activation effect was highlighted by the highest degradation rate of 6.88 mg.h⁻¹. The degradation carried out by the combined plasma–photocatalysis system at 22 and 45 mg.m⁻³ exhibited interesting performances with a stable removal efficiency of 100 and 70 % for the two concentrations, respectively.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115380"},"PeriodicalIF":5.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient hydrogen production from ammonia over Ru-Co/SiC catalysts","authors":"M. Pinzón ,&nbsp;C. Martín ,&nbsp;A. Romero ,&nbsp;A.R. de la Osa ,&nbsp;P. Sánchez","doi":"10.1016/j.cattod.2025.115378","DOIUrl":"10.1016/j.cattod.2025.115378","url":null,"abstract":"<div><div>This study provides a valuable insight into the influence of the order impregnation of ruthenium and cobalt on β-SiC support as catalysts for efficient green hydrogen production from ammonia. The catalysts were characterized using different techniques such as Temperature Programmed Reduction, X-Ray Diffraction, Transmission Electron Microscopy and Scanning Electron Microscopy. The addition of Ru clearly changed the reduction profile, decreasing the temperature to obtain metallic species. The catalyst prepared by co-impregnation inhibited the formation of Co silicates, which are very difficult to reduce. Additionally, the metal size was also affected by the order of impregnation, with the co-impregnation method showing the smallest crystallite sizes and the highest hydrogen production. On the other hand, it was found that the 2.5 wt% total metal content catalyst improved the hydrogen production rate by 41 % compared to 5 wt% total metal content at 350 ºC, justifying the use of a lower metal loading. Therefore, the highest activity was achieved with a Ru/Co co-impregnation with a 50/50 wt ratio and a metal loading of 2.5 wt%, which exhibited excellent activity and stability with 95 % conversion over 50 hours of reaction.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115378"},"PeriodicalIF":5.2,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient photodegradation of Axetine in distilled and tap water by ZnO and CuOx/ZnO films on glass and ITO substrates","authors":"Nina Kaneva","doi":"10.1016/j.cattod.2025.115373","DOIUrl":"10.1016/j.cattod.2025.115373","url":null,"abstract":"<div><div>In this work, ZnO and CuOx/ZnO sol-gel films are synthesized and employed as photocatalysts for ultraviolet irradiation. The synthesis procedure is straightforward and eco-friendly, based on the photo-fixation of CuOx ions onto ZnO films via UV illumination for the first time. Photofixation involves surface functionalization through photodeposition using ultraviolet light. Utilizing the dip-coating technique, ZnO and CuOx/ZnO films are deposited on indium tin oxide (ITO) and glass substrates. The photocatalytic efficiency of the newly developed films is assessed through the degradation of Axetine in distilled and tap water. Sol-gel films on ITO demonstrate greater photocatalytic efficiency compared to those on glass substrates. Differences in surface morphology, interfacial lattice mismatch, charge transfer, and crystallinity can account for the variations in film efficiencies. Furthermore, the formation of acceptor levels in the ZnO band gap enhances the efficiency of separating photogenerated electron-hole pairs, explaining the broadening of the spectral range of CuOx/ZnO irradiation into the visible region. CuOx enhances photoactivity by generating the hyperactive oxygen radical O₂^•–. Additionally, after three cycles of use, all four types of sol-gel films maintained their photocatalytic activity, indicating their potential usefulness in the treatment of pharmaceutical wastewater.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115373"},"PeriodicalIF":5.2,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The relevant role of TiO2 for enhancing the Ru/TiO2-catalyzed conversion of levulinic acid to γ-valerolactone","authors":"Z. Ruiz-Bernal,&nbsp;E.G. Tane,&nbsp;J. Sánchez-Lozano,&nbsp;J.M. Rives-López,&nbsp;M.C. Román-Martínez,&nbsp;M.A. Lillo-Ródenas","doi":"10.1016/j.cattod.2025.115375","DOIUrl":"10.1016/j.cattod.2025.115375","url":null,"abstract":"<div><div>Levulinic acid (LA), that can be obtained from the acidic hydrothermal carbonization of biomass, is a platform molecule with several possibilities to be transformed into useful chemicals. The hydrogenation of LA to γ-valerolactone (GVL) requires a bifunctional catalyst, with both metallic and acidic active sites. In this study, TiO₂ was the selected support due to its acidic properties, and Ru was the metal phase due to its high activity in this reaction. 1 wt% Ru/TiO₂ catalysts were prepared using either commercial P25 or TiO₂ prepared by hydrothermal (HT) synthesis (with or without the addition of a low concentration HCl solution). The catalysts were used without previous reduction in catalytic tests carried out under mild reaction conditions, and the influence of the surface chemistry, porosity, crystalline structure, and oxygen vacancies of the TiO₂ supports, as well as the interaction between Ru and the TiO₂ supports were studied. All the catalysts demonstrated promising results under mild reaction conditions (24 – 65 % GVL yield), being the catalytic activity enhanced when using the Ru/HT-TiO₂ catalysts compared to the analogous Ru/P25. This indicates that a higher surface area of the supports improves the catalytic performance. High GVL yield (65 %) and excellent reusability over three cycles were achieved with the best catalyst, synthesized by HT without using HCl solution. Although isolating the effect of individual variables remains challenging, our results have shown that the surface chemistry composition and content of the synthesized TiO₂ supports have some influence on the formation of Ru⁰ on them.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115375"},"PeriodicalIF":5.2,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124505","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of ozone treatment on microwave heating properties of carbon fiber","authors":"Zhihai Huang ,&nbsp;Hisahiro Einaga","doi":"10.1016/j.cattod.2025.115386","DOIUrl":"10.1016/j.cattod.2025.115386","url":null,"abstract":"<div><div>In this study, pitch-based carbon fibers were subjected to ozone treatment, resulting in carbon fibers with enhanced microwave heating performance. The alterations in the surface functional groups of the carbon fiber samples were characterized using XPS and FTIR. Changes in the sample surface area and pore distribution were determined based on the nitrogen adsorption isotherms at 77 K. Raman spectroscopy was used to identify variations in the mechanical structure of the samples. Furthermore, an analysis of the electromagnetic field dependence of carbon fiber microwave heating demonstrated that the primary contributing factor for microwave heating in carbon fibers is their high dielectric loss characteristics. In addition, ozone treatment influenced the dielectric loss of the carbon material. The ozone-treated carbon fibers exhibited enhanced microwave heating performance and superior heating reproducibility. This study provides substantive insights into the concurrent utilization of the multifaceted properties of carbon fibers to engineer microwave absorbers with enhanced efficiency and augmented heat conversion capabilities.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115386"},"PeriodicalIF":5.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Activity of Fe2O3/CeO2-Al2O3 catalysts/oxygen carriers in a fluidized bed chemical looping process for blue hydrogen production","authors":"Achmad Ferdiansyah Pradana Putra ,&nbsp;Wasim Ullah Khan ,&nbsp;Sofien Cavagnol ,&nbsp;Shaikh A. Razzak ,&nbsp;Dwi Hantoko ,&nbsp;Mohammad Mozahar Hossain","doi":"10.1016/j.cattod.2025.115387","DOIUrl":"10.1016/j.cattod.2025.115387","url":null,"abstract":"<div><div>The transition to achieving net zero emissions by 2050 requires a significant increase in green hydrogen, produced using renewable energy and emitting no carbon. As different actors are working on the deployment of technologies to produce green hydrogen at large scale a technological bridge is necessary for the shift from gray hydrogen to green hydrogen in the new energy paradigm. Extensive research is underway to enhance hydrogen production and reduce production costs, particularly in the technology of blue hydrogen production. Chemical looping technology is one innovation developed to reduce the costs by separate CO₂ in situ without requiring a separation unit. The success of the chemical looping process depends on selecting the ideal oxygen carrier to facilitate the reaction. Previous research has indicated that iron possesses the desired chemical and physical attributes, making it cost-effective and easily obtainable. Additionally, determining the appropriate amount of iron added to Al₂O₃ as support is crucial for optimizing the reaction process and preventing the deactivation of the oxygen carrier. This study explores the effects of adding iron to a Ce-modified Al₂O₃ support in hydrogen production through chemical looping tested in a fluidized bed reactor. Research findings indicate that at a temperature of 650 °C, F20Ce-Al demonstrates more potential for reduction to the iron state in fuel reactors compared to F30Ce-Al, primarily due to the involvement of the water-gas shift reaction (WGSR) in the reaction using F20Ce-Al. During the operation of the steam reactor, it was observed that F30Ce-Al exhibited the highest hydrogen production among the tested oxygen carriers within the first 5–16 seconds. However, beyond 16 seconds, hydrogen production decreased due to agglomeration of the oxygen carrier during the reaction process. In contrast, F20Ce-Al demonstrated the best performance in H₂ production compared to the other oxygen carriers.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115387"},"PeriodicalIF":5.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144098715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CO2 hydrogenation to methanol over CeO2-ZrO2-supported Cu-Ga catalysts: Influence of catalyst composition on catalytic performance","authors":"Devaiah Damma ,&nbsp;Bhagatram Meena ,&nbsp;Panagiotis G. Smirniotis","doi":"10.1016/j.cattod.2025.115382","DOIUrl":"10.1016/j.cattod.2025.115382","url":null,"abstract":"<div><div>To address the challenges posed by the greenhouse effect and climate change, and to achieve carbon neutrality, the hydrogenation of CO₂ into methanol (CH₃OH/MeOH) has gained significant attention due to its utility as a fuel and fuel additive. In this study, we synthesized bi-metallic catalysts based on Ga/Cu supported on ZrO₂- and CeO₂-based oxides using the wet impregnation method for the direct hydrogenation of CO₂ into methanol. The catalyst composition and metal-support interaction (MSI) were identified as critical factors influencing methanol production. Our findings revealed that the appropriate dispersion of metallic particles on the support significantly enhanced both CO₂ conversion and methanol selectivity. A synergistic effect was observed for Ga and Cu supported on a CeO₂/ZrO₂ composite (80:20), achieving highest CO₂ conversion of 15 % at reaction conditions of 300 °C and 410 psi. 1Cu1Ga/CZ (80:20) catalyst exhibits durability over 100 hours at 240° C possess 7.2 % conversion of CO₂ with 50 % of MeOH selectivity without significant decaying under the pressure of 410 psi and space velocity of 4500 mLh⁻¹g⁻¹. H₂-TPR and CO₂-TPD analyses indicate that the 1Cu1Ga/CZ (80:20) catalyst exhibits the highest redox activity and CO₂ adsorption capacity among all the catalysts tested. Additionally, the study emphasizes the importance of optimizing metal (promoter) loading and support composition to maximize catalytic performance and enhance methanol yield.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115382"},"PeriodicalIF":5.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coking-driven activation of NixFe3-xO4 doped waste-derived carbon: From methanol decomposition to enhanced alkaline OER catalysis","authors":"Consolato Rosmini ,&nbsp;Hristo Kolev ,&nbsp;Nikolay Velinov ,&nbsp;Daniela Karashanova ,&nbsp;Daniela Kovacheva ,&nbsp;David Sebastián ,&nbsp;Maria Jesus Lázaro ,&nbsp;Gebrehiwet Abrham Gebreslase ,&nbsp;Boyko Tsyntsarski ,&nbsp;Momtchil Dimitrov","doi":"10.1016/j.cattod.2025.115365","DOIUrl":"10.1016/j.cattod.2025.115365","url":null,"abstract":"<div><div>Hydrogen production via methanol decomposition is a promising route for sustainable energy, but catalyst deactivation due to coking remains a major challenge. The issue is even more critical for low-cost catalysts, as their reuse or disposal poses environmental and economic concerns. In this study, activated carbon derived from industrial coal-tar pitch waste was modified through two different hydrazine-based thermal treatments, doped with 40 wt% Ni_xFe_3-xO₄ spinels, and subjected to prolonged methanol decomposition to induce coking. All synthesized and spent catalysts were tested for the alkaline oxygen evolution reaction (OER). Notably, the coked catalyst derived from low-temperature hydrazine treatment exhibited improved electrocatalytic performance compared to the parent materials, achieving considerably lower OER overpotentials due to an increased electrochemically active surface area and reduced charge transfer resistance. The carbon coking induced by the methanol decomposition was found to be beneficial for enhancing the overall electrochemical properties of the catalyst depending on their preparation procedure. These findings highlight a new strategy for repurposing spent catalysts in electrocatalytic applications, offering a sustainable approach to catalyst lifecycle management.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115365"},"PeriodicalIF":5.2,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144070110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modification of the textural and Ti speciation of Ti-silicalite by post-synthesis treatments and their effects on the catalytic ammoximation of cyclopentanone to its oxime","authors":"Ana Orozco-Saumell ,&nbsp;José Manuel Jiménez-Martín ,&nbsp;José Iglesias ,&nbsp;Rafael Mariscal ,&nbsp;Manuel López Granados","doi":"10.1016/j.cattod.2025.115370","DOIUrl":"10.1016/j.cattod.2025.115370","url":null,"abstract":"<div><div>The catalytic activity of TS-1 materials in the ammoximation of cyclopentanone to cyclopentanone oxime has been investigated. The studied TS-1 systems were prepared by post-synthesis modifications of a parent sample, namely, HCl washing, hydrothermal treatments with ethylamine (EA) and with EA combined with tetrapropylammonium bromide (EA-TPABr). The catalysts were characterized by ICP-OES, SEM and TEM, N2 adsorption, XRD, XPS, and UV-Vis spectrophotometry, to gain information on the textural properties and the Ti speciation, both at the surface and the bulk of the materials. UV-Vis studies were conducted under conditions that render the extensive hydration of the framework Ti sites, the situation expected in the aqueous reaction mixture. The order of intrinsic activity of the catalysts obtained were: EA-TPABr &gt; HCl &gt; EA ≈ parent TS-0.10. It is concluded that the relevant Ti species are extensively hydrated (SiO)₂-Ti-(OH)₂(H₂O)₂, rather than open (SiO)₃-Ti-(OH) sites. The overall activity of the (SiO)₂-Ti-(OH)₂(H2O)₂ sites, present in the different catalysts is modulated by the presence of hierarchical mesoporosity (EA-TPABr sample), the removal of Ti oxide fouling the surface (HCl sample) and the stripping of Ti framework from the surface (EA sample) that are generated with the different treatments. It is also observed that, contrary to what has previously been proposed, the presence of hierarchical mesoporosity does not prevent deactivation. Instead, it enhances catalyst life by increasing the accessibility of reactants to more Ti sites rather than accommodating more deposits. These findings highlight the importance of tailored post-synthesis modifications in optimizing TS-1 catalysts for ammoximation reactions.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115370"},"PeriodicalIF":5.2,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144124507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen production by catalytic upgrading of volatiles from pyrolysis of fibre-reinforced plastic waste","authors":"A. Lopez-Urionabarrenechea,&nbsp;J.P. Gonzalez-Arcos,&nbsp;A. Serras-Malillos,&nbsp;B.B. Perez-Martinez,&nbsp;E. Acha,&nbsp;B.M. Caballero","doi":"10.1016/j.cattod.2025.115369","DOIUrl":"10.1016/j.cattod.2025.115369","url":null,"abstract":"<div><div>The upgrading of the volatiles coming from the pyrolysis of fibre-reinforced plastic waste is studied in this work. The experiments have been carried out in a lab-scale installation composed of two reactor connected in series, in order to pyrolyse the sample in the first reactor and upgrade the volatiles in the second one. The pyrolysis has been carried out at 500 °C and the upgrading has been conducted at 900 °C in the presence of a pre-reforming catalyst, a H₂S sorbent, the both of them and none of them. The results show that the upgrading step is required to eliminate the complex pyrolysis oils generated with this type of waste and to enhance the production and improve the composition of the gases. The pre-reforming catalyst increases the performance of the upgrading step, providing a hydrogen yield of 57.8 %. The H₂S sorbent is able to eliminate the 80 % of the H₂S and allows the better performance of the catalyst, yielding the highest gas production (10.4 wt%), hydrogen concentration (53.5 vol%), syngas concentration (75.5 vol%), and hydrogen yield (69.3 %).</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115369"},"PeriodicalIF":5.2,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143942534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}