Catalysis Today最新文献

{"title":"Catalytic co-pyrolysis of walnut shell and high-density polyethylene (HDPE) using nickel-doped gamma alumina spent adsorbent derived catalyst: Kinetics, thermodynamic and prediction modelling using artificial neural network (ANN) approach","authors":"Deepak Bhushan ,&nbsp;Srikant Kumar ,&nbsp;Prasenjit Mondal","doi":"10.1016/j.cattod.2025.115388","DOIUrl":"10.1016/j.cattod.2025.115388","url":null,"abstract":"<div><div>The present study is focused on evaluating the catalytic effect of nickel impregnated spent aluminium hydroxide nanoparticle (AHNP) adsorbent-based catalyst in the co-pyrolysis of walnut shell and high-density polyethylene (HDPE). The analysis was conducted through kinetic and thermodynamic assessments. Specific kinetic parameters, such as activation energy and pre-exponential factor, along with thermodynamic parameters, including entropy, enthalpy, and Gibbs free energy, was estimated using iso-conversional models such as Ozawa Flynn Wall (OFW), Kissinger Akahira Sunose (KAS) and Starink model. Thermogravimetric analysis of pyrolysis of walnut shell, HDPE, blend of walnut shell and HDPE (1:1) and blend of feedstock with catalyst (1:1) was conducted at different heating rates of 10–40 °C/min respectively. The results showed that the incorporation of nickel doped gamma alumina (NAO) catalyst lowered the activation energy (E_a) of co-pyrolysis of walnut shell and HDPE by 28 % as calculated by KAS method. Moreover, artificial neural network (ANN) was also applied for the predictive modelling of the degradation of walnut shell and HDPE where high regression (R≈0.99) as well as low mean squared error (&lt;10⁻⁵) illustrated the accurate prediction of complex biomass and plastics degradation by the ANN model. Therefore, catalyst derived from waste AHNP has considerable potential to be utilized for the co-pyrolysis of biomass with plastics, enhancing the process's cost effectiveness, environmental sustainability, and renewability.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"459 ","pages":"Article 115388"},"PeriodicalIF":5.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168070","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":"Coupling Ga(OH)3 and chromate as a universal cocatalyst for CO2 photoreduction by H2O","authors":"Xuanwen Xu ,&nbsp;Yuehao Lu ,&nbsp;Shuying Wang ,&nbsp;Lele Fan ,&nbsp;Pengyu Dong ,&nbsp;Zheng Wang ,&nbsp;Ruiyu Jiang","doi":"10.1016/j.cattod.2025.115372","DOIUrl":"10.1016/j.cattod.2025.115372","url":null,"abstract":"<div><div>Development of effective and universal cocatalysts are very important to the photocatalytic conversion of CO₂ by H₂O. Herein, CO evolution from this reaction was successfully promoted by co-catalytic coupling featuring Ga(OH)₃ loading onto photocatalyst surfaces and <em>in situ</em> addition of Na₂CrO₄. This strategy exhibited excellent universality for a series of Ta- and Ga-based photocatalysts. Modifications of Ga(OH)₃ created active sites for CO production on the photocatalyst surfaces. The <em>in situ</em> addition of Na₂CrO₄ improved CO evolution activity when two factors were satisfied: (1) active sites for CO evolution were created using the proper cocatalysts and (2) the photocatalyst surfaces were sufficiently quenched by hydroxide ions.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115372"},"PeriodicalIF":5.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115124","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":"Surface growth of mixed metal oxide thin rafts and their impact on methane dry reforming","authors":"Manar Halabi,&nbsp;Jin Wang,&nbsp;Akshay Soni,&nbsp;Oz M. Gazit","doi":"10.1016/j.cattod.2025.115371","DOIUrl":"10.1016/j.cattod.2025.115371","url":null,"abstract":"<div><div>Synergistic interactions between the supported thin oxide layer and the underlying metal oxide support led to the development of novel and exciting material properties. In this work, we present a new and general approach for the surface growth of MgAl layered double hydroxides (LDH) on ZrO₂, Al₂O₃, and TiO₂ support materials. We examine the synergistic interactions between the top MgAlO_x mixed metal oxide (MMO), obtained after LDH calcination, and the underlying metal oxide support (MMO/metal oxide) as a function of MMO loading and support type. The obtained materials are characterized using a range of analytical tools ICP-OES, H₂-TPR, CO₂-TPD, PXRD, TGA/DSC, physisorption, HRSEM-EDS and HAADF-STEM–EDS followed by catalytic testing. We show that regardless of the MMO/metal oxide combination, effective interaction between the MMO and the underlying support, more dominant at the lower MMO coverage, promotes synergistic effects, manifested by a lower Ni reduction temperature compared to Ni on bulk MMO. Evaluating the obtained catalysts (Ni/MMO/metal oxide) in the dry reforming of methane (DRM) reaction, we find that the increase in MgAlO_x-MMO coating amount on the ZrO₂ nanoparticles (NPs) leads to an improvement in DRM activity and stability. In addition, we find that for the same MgAlO_x-MMO coating amount, the Ni catalyst based on the ZrO₂ NPs is superior to the catalyst based on Al₂O₃ NPs, while the catalyst based on TiO₂ NPs is the least active. The obtained results are explained in context to the extent of coating, metal support interaction (MSI) levels, and support structure. Combined with the high versatility of LDH material, this new methodology provides a versatile synthetic route to adapt the surface property of an oxide to a certain application. For DRM, we show the tuning of MSI as governed by the interactions between the underlying metal oxide and supported MMO.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115371"},"PeriodicalIF":5.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144115125","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":"Promotion effect of nickel on the stability of NiMnAl catalysts for the PET glycolysis","authors":"Hezrom S. Nascimento ,&nbsp;Rharyne H.M. França ,&nbsp;Stevie H. Lima ,&nbsp;Ana P. Arcanjo ,&nbsp;Elvis J. França ,&nbsp;Aline M. Castro ,&nbsp;Marcos L. Dias ,&nbsp;Richard Landers ,&nbsp;Celmy M.B.M. Barbosa ,&nbsp;Roger Frety ,&nbsp;Maria Fernanda Pimentel ,&nbsp;Jose G.A. Pacheco","doi":"10.1016/j.cattod.2025.115376","DOIUrl":"10.1016/j.cattod.2025.115376","url":null,"abstract":"<div><div>NiMnAl oxides catalysts obtained from coprecipitated precursors were used in the PET glycolysis depolymerization reaction. These precursors exhibited different phases, including LDH, hausmannite, and rhodochrosite depending on the synthesis conditions. The NiMnAl trimetallic oxides displayed higher surface area and pore diameter than MnAl bimetallic oxide. Sodium-based precipitants formed a more crystalline manganese oxide phase and a higher synthesis yield than the ammonium carbonate/ hydroxide. Catalysts containing a lesser Ni/Mn molar ratio exhibited higher activity for PET glycolysis. The presence of nickel in NiMnAl oxide improved from 49 % to 96 % the catalyst recovery after the reaction. This property relates to a strong electronic interaction between nickel and manganese and the suppressed Jahn-Teller distortion effect. The best catalyst was Ni_0,22Mn_0,45Al_0,33-Sod, reaching 100 % PET conversion and 85 % BHET yield in the following conditions: 60 min, catalyst: PET = 0.5 %, EG: PET = 5:1. This catalyst demonstrated high performance after 5 cycles of reuse without calcination between cycles. Kinetic modeling revealed an initial shrinking core behavior changing to a pseudo-first-order model at the later stage of the reaction.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"458 ","pages":"Article 115376"},"PeriodicalIF":5.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130924","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":"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}