Catalysis Today最新文献

{"title":"Conversion of dimethyl ether to hydrocarbons catalyzed by Pd-loaded *MRE zeolites","authors":"Benjamin Niethammer ,&nbsp;Foteini Zormpa ,&nbsp;Gia Trung Hoang ,&nbsp;Nikolaj Aljoscha Slaby ,&nbsp;Thomas Anthony Zevaco ,&nbsp;Stamatia Karakoulia ,&nbsp;Ulrich Arnold ,&nbsp;Jörg Sauer","doi":"10.1016/j.cattod.2025.115258","DOIUrl":"10.1016/j.cattod.2025.115258","url":null,"abstract":"<div><div>The influence of Pd loading on the conversion of dimethyl ether (DME) to hydrocarbons (DTH) was investigated for *MRE-type zeolite catalysts. Catalysts with different Pd loadings were prepared by incipient wetness impregnation and characterized in terms of morphology, composition and acidity. Co-feeding of H₂ during DME conversion increased the resistance of the Pd/*MRE catalysts to deactivation, which significantly increased their lifetimes and thus conversion capacities. The product spectra show high olefin contents, comprising light olefins and higher olefins in the C₅–C₁₁ range, while contents of aromatics are low. H₂ co-feeding reduces the formation of cyclic hydrocarbons and increases the formation of n- and iso-alkanes as well as olefins. Higher Pd loadings slightly decrease olefin production but increase paraffin formation, indicating direct hydrogenation of olefins on Pd nanoparticles. The olefin-rich products offer several possibilities for further processing to fuels and chemicals.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"453 ","pages":"Article 115258"},"PeriodicalIF":5.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143621448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimizing operational strategies in a non-isothermal bench-scale fixed-bed reactor for CO2 hydrogenation to CH4 combining experimental and modeling and simulation approaches","authors":"Elena Gómez-Bravo,&nbsp;Unai De-La-Torre,&nbsp;José A. González-Marcos,&nbsp;Juan R. González-Velasco,&nbsp;Beñat Pereda-Ayo","doi":"10.1016/j.cattod.2025.115256","DOIUrl":"10.1016/j.cattod.2025.115256","url":null,"abstract":"<div><div>The CO₂ methanation reaction is a promising solution for renewable energy storage. However, the process is challenged by thermal management due to its exothermic nature, leading to hot spots that complicate reactor operation and scale-up. This study combines experimental and simulation approaches to optimize the operation of a bench-scale fixed-bed reactor. Experimental results show that reactor wall temperature, flow rate, and nitrogen dilution significantly affect temperature profiles and CO₂ conversion. As a refrigeration strategy, it has been studied the use of pressurized air jackets to improve heat dissipation and stabilize the operation. A dynamic 1D heterogeneous model validated these findings and enabled simulation-based optimization. Non-uniform particle size distributions, metal loading, and SiC dilution strategies effectively mitigated hot spots without compromising CH₄ yield. These results offer critical insights into reactor design, ensuring stable operation and high efficiency.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"453 ","pages":"Article 115256"},"PeriodicalIF":5.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549288","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 role of promoters in enhancing hydrogen production during catalytic decomposition of methane","authors":"Dwi Hantoko ,&nbsp;Wasim Ullah Khan ,&nbsp;Ali M. Alomran ,&nbsp;Ariel H. Gursida ,&nbsp;Mohammed Saud Hammad ,&nbsp;Srinivasakannan Chandrasekar ,&nbsp;Mohammad M. Hossain","doi":"10.1016/j.cattod.2025.115259","DOIUrl":"10.1016/j.cattod.2025.115259","url":null,"abstract":"<div><div>Catalytic methane decomposition is a promising process for co-production of CO_x free hydrogen and carbon nanomaterials. In this work, iron-based catalysts, supported on ZSM5, were studied as an active catalyst for methane decomposition and nickel and cobalt were used to boost the methane conversion and catalyst stability. The prepared catalysts were tested at 700 °C with the 9:1 CH₄ to Ar feed ratio under atmospheric pressure in a fixed bed tubular reactor. The diffraction peaks showed the formation of corresponding metal oxides and their combination species. The activity profiles implied that promoted iron-based catalyst (NiFe/ZSM5) outperformed the rest of the catalysts with an initial activity of 81.51 % that remained 75 % at the end of 170 min time-on-stream. The unpromoted (Fe/ZSM5) suffered deactivation over time and hence NiFe/ZSM5 turned out to be the active and stable catalyst among the tested catalysts. The high-resolution transition electron microscopy (HRTEM) images of the best catalyst indicated the growth of multiwalled carbon nanotubes which followed tip-base-growth mechanisms.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"453 ","pages":"Article 115259"},"PeriodicalIF":5.2,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143549289","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":"Pulsed laser ablation-synthesized FePt nanoparticles have enhanced catalytic nitrite reduction activity","authors":"Kiheon Hong ,&nbsp;Welman C. Elias ,&nbsp;Kimberly N. Heck ,&nbsp;Tanguy Terlier ,&nbsp;Dimpel Dimpel ,&nbsp;Wei Qian ,&nbsp;Bing Liu ,&nbsp;Takao Kurihara ,&nbsp;Michael S. Wong","doi":"10.1016/j.cattod.2025.115254","DOIUrl":"10.1016/j.cattod.2025.115254","url":null,"abstract":"<div><div>Nitrate/nitrite pollution of water resources is an ubiquitous problem primarily due to the over application of fertilizer. While commercial methods which remove nitrates/nitrites exist, techniques which directly destroy the pollutants are more desirable. Nitrate/nitrite reduction by precious metal catalysts is one promising method to permanently convert nitrate/nitrite to non-toxic analogs. Amongst these, iron-platinum (“FePt”) compositions are generally considered inactive for NO₂^-. In this study, we demonstrate that bimetallic FePt catalysts synthesized via a pulsed-laser-ablation-in-liquid method (“PLAL-FePt NPs”) exhibit notably improved activity for NO₂^- compared to those synthesized by incipient wetness impregnation (“FePt/SiO₂”) with the same elemental composition. While FePt/SiO₂ catalyst (60 at% Pt) had nitrite reduction activity, the PLAL-FePt NPs (57 at%) were ∼8 times more active (k_cat ≈ 4.6 <em>vs.</em> 39.5 Lmin⁻¹g_{surface Pt}⁻¹) on a per surface Pt basis. When compared to the monometallic Pt catalyst, the PLAL-FePt NPs were ∼2 times more active. X-ray diffraction (XRD) show PLAL-FePt NPs to have intermetallic phases of Pt₃Fe₁ and Pt₁Fe₁. In contrast, FePt/SiO₂ have multiple phases (Pt, Pt₃Fe₁, Pt₁Fe₁, and Pt₁Fe₃). X-ray photoelectron spectroscopy (XPS) showed that Pt gained electron density from Fe, correlating to the increased nitrite reduction activity of both bimetallic materials. These findings indicate an earth-abundant element like iron can improve platinum catalysis, highlighting Fe-Pt intermetallic alloys for further study as hydrogenation catalysts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"453 ","pages":"Article 115254"},"PeriodicalIF":5.2,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143548761","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":"Piezoelectric catalyst BaTiO3 and K0.5Na0.5NbO3 induced cellular and antibacterial response in poly (vinylidene fluoride) for self-powered implants for orthopedic applications","authors":"Kuntal Kumar Das ,&nbsp;Urvashi Kesarwani ,&nbsp;Ravi Prakash ,&nbsp;Pralay Maiti ,&nbsp;Om Shankar ,&nbsp;Ashutosh Kumar Dubey","doi":"10.1016/j.cattod.2025.115255","DOIUrl":"10.1016/j.cattod.2025.115255","url":null,"abstract":"<div><div>Despite of excellent biocompatibility of piezoelectric poly(vinylidene fluoride) (PVDF), lower resistance towards bacteria and piezoelectric coefficient restricts it’s widespread application as self-powered implant. Towards this end, this study investigates the effect of incorporation of piezo-catalysts BaTiO₃ (BT) and K_0.5Na_0.5NbO₃ (KNN) into PVDF on piezo-catalytic characteristics, cellular and antibacterial response. Thin films of PVDF and its composites were prepared using the solvent casting method and hot compression molding. The piezo-catalytic response is observed to be notably higher in the composites than that of pure PVDF. The measured values of voltage, and power for PVDF, PVDF-10 wt% BT (PVDF-10BT) and PVDF-10 wt% KNN (PVDF-10KNN) are (24 V, ∼4.4 µW/cm²), (92 V, ∼15.8 µW/cm²) and (103 V, ∼19.4 µW/cm²), respectively. The presence of piezo-catalyst BT and KNN significantly enhance the cell proliferation, osteogenic differentiation (ALP) of MG-63 osteoblast-like cells and hemocompatibility. Incorporation of piezo-catalysts is observed to improve significantly the antibacterial response against Escherichia coli (<em>E. coli</em>) and Staphylococcus aureus (<em>S. aureus</em>) due to a higher production of reactive oxygen species. These results suggest that PVDF modified with BaTiO₃ and K_0.5Na_0.5NbO₃ piezo-catalysts are promising candidates as self-powered implants for orthopedic applications.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115255"},"PeriodicalIF":5.2,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143547819","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":"Doping-induced Structural Transformations in Maghemite for Enhanced Ortho-Para Hydrogen Conversion","authors":"Jiuyi Wang ,&nbsp;Caizhen Yue ,&nbsp;Jian zhao ,&nbsp;Xiong Zhang ,&nbsp;Shifu Wang ,&nbsp;Zheng Shen ,&nbsp;Nan Yin ,&nbsp;Xiaofeng Yang ,&nbsp;Guodong Liu ,&nbsp;Xuning Li ,&nbsp;Yanqiang Huang ,&nbsp;Tao Zhang","doi":"10.1016/j.cattod.2025.115243","DOIUrl":"10.1016/j.cattod.2025.115243","url":null,"abstract":"<div><div><em>Ortho-para</em> hydrogen (<em>o-p</em> H₂) conversion is a critical process for liquid hydrogen storage and transportation. Developing efficient catalysts for such process is the key at the heart of hydrogen economy while limited by the puzzling structure/reactivity correlation. In this contribution, a series of secondary transition metal doped Fe₂O₃ nanoparticles (M-Fe₂O₃, M = Cu, Ni, Zn) were controllably prepared <em>via</em> a simple thermal treatment approach and thoroughly characterized for clarifying the structure-function relationship toward <em>o-p</em> H₂ conversion. The reaction rate for <em>o-p</em> H₂ conversion reaction rate for <em>o-p</em> H₂ conversion over Fe₂O₃ was significantly enhanced by doping with Cu (0.41x10⁻³ kmol L⁻¹ s⁻¹) and Ni (0.32x10⁻³ kmol L⁻¹ s⁻¹), showing notably higher compared to that of Zn-Fe₂O₃ (0.13x10⁻³ kmol L⁻¹ s⁻¹). Results from Mössbauer measurements revealed that doping with Cu and Ni increases the proportion of Fe³⁺ in tetrahedral-site (A-site) of γ-Fe₂O₃, which is responsible for the enhanced <em>o-p</em> H₂ conversion. Furthermore, the higher specific surface area resulting from Cu and Ni doping were also demonstrated as non-innocent factor involved in <em>o-p</em> H₂ conversion due to enhanced active sites exposure and H₂ diffusion. Our work clarifies the crucial role of transition metal doping in iron oxides for enhancing <em>o-p</em> H₂ catalytic conversion, which may pave the way for the development of novel efficient <em>o-p</em> H₂ conversion catalysts for advancing the broader utilization of hydrogen energy.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115243"},"PeriodicalIF":5.2,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510111","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":"On the effect of Li or Na doping on Ru/TiO2 catalyst for CO2 methanation","authors":"Stefano Cimino,&nbsp;Elisabetta Maria Cepollaro,&nbsp;Luciana Lisi","doi":"10.1016/j.cattod.2025.115245","DOIUrl":"10.1016/j.cattod.2025.115245","url":null,"abstract":"<div><div>Metal-support interactions can widely affect or even dominate the catalytic activity, selectivity, and stability of supported Ru nanoparticles during the CO₂ methanation. In this work, we report on the effects of doping a Ru/TiO₂ catalyst with either Li or Na (3 % wt.) with the general aim to provide a large pool of surface basic sites of weak/medium strength capable to promote CO₂ adsorption and methanation at low temperature. However, catalytic kinetic measurements show that both alkali metals hinder the activity of the parent catalyst by different mechanisms. Detailed catalysts characterization (by XRD, porosimetric analysis, CO-DRIFTS, CO₂-TPD and H₂-TPSR) and operando DRIFTS experiments are used to evaluate the specific impact on the type of CO₂-derived adsorbed and intermediate species and on possible reaction pathways by also comparing the results with analogue Ru-catalysts supported on γ-Al₂O₃</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115245"},"PeriodicalIF":5.2,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143488168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Double metal cyanide complex as a heterogeneous catalyst for depolymerization of polyesters","authors":"Tong Chang ,&nbsp;Yujia Wang ,&nbsp;Zhenjiang Li,&nbsp;Yongzhu Hu,&nbsp;Na Shi,&nbsp;Xin Zou,&nbsp;Chunyu Li,&nbsp;Yue Xu,&nbsp;Ning Li,&nbsp;Kai Guo","doi":"10.1016/j.cattod.2025.115241","DOIUrl":"10.1016/j.cattod.2025.115241","url":null,"abstract":"<div><div>Plastic wastes have caused a series of environmental issues, and it has become imperative to promote the recycling of them. As an effective means to solve environmental problems and resource utilization, the chemical depolymerization of polyester via transesterification reaction was practical. Therefore, finding industrially viable transesterification catalysts is an effective strategy for establishing a recycling route for polyester plastics. Herein, we report double metal cyanide complex (DMC) directly catalyze polyester depolymerization to recover the corresponding monomers or chemicals. Poly(ethylene terephthalate) (PET) was used as representative polyester to investigate the influences of experimental conditions including the loading of the catalyst and the molar ratio of ethylene glycol (EG) to PET on the depolymerization of polyester and the selectivity of monomeric products. The kinetics of the glycolysis has been measured. PET could be completely depolymerized at 190 °C by 2 h with the molar ratio of EG/PET of 15 : 1 and the catalyst loading of 1 wt%. DMC also showed high catalytic activity on the depolymerizations of other commercial plastics of ester main-chains. DMC, a solid catalyst enjoyed inexpensive, robust, and water tolerant features in industrial process, showed prominent activity and selectivity in polyester depolymerizations and suggested scale commercial application scenario.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115241"},"PeriodicalIF":5.2,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143534327","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 synthesis methods on the physico-chemical and catalytic properties of Ni 13X and Ni 5A zeolite catalysts in CO2 methanation","authors":"Liangyuan Wei ,&nbsp;Narendra Kumar ,&nbsp;Wim Haije ,&nbsp;Janne Peltonen ,&nbsp;Markus Peurla ,&nbsp;Henrik Grénman ,&nbsp;Wiebren de Jong","doi":"10.1016/j.cattod.2025.115239","DOIUrl":"10.1016/j.cattod.2025.115239","url":null,"abstract":"<div><div>Zeolite 13X and 5A were modified with nickel using three different methods: evaporation impregnation, deposition precipitation, and ion-exchange for comparison in CO₂ methanation. The catalysts were tested in a lab scale fixed bed reactor and their physico-chemical properties were characterized by XRD, SEM-EDX, TEM, STEM-EDX, nitrogen physisorption, H₂-TPR and NH₃-TPD. The physico-chemical characterization results of Ni modified 13X and 5A zeolite catalysts showed that the zeolite structure did not change after the Ni modification by different catalyst synthesis methods, although the surface area and micro-pore volume decreased. The average diameter of NiO and the NiO cluster size range of Ni zeolite catalyst synthesized with ion exchange are smaller than the catalysts prepared by the evaporation impregnation and deposition preparation. Ni dispersed well through 13X, while a lot of Ni appeared on the crystal outer surface of 5A zeolite. Evaporation impregnation and deposition precipitation prepared Ni13X catalysts exhibited a higher activity than ion-exchange prepared samples on CO₂ methanation. The catalyst performance of Ni5A-IE and Ni13X-IE zeolite catalysts, which were synthesized using the ion-exchange method for CO₂ methanation was limited by the actual loading of Ni. The Ni 13X catalysts have less CH₄ selectivity which could be attributed to their lower acidity. Ni13X-EIM catalyst showed good catalytic stability at 360 °C, with no catalyst deactivation during a 200 h catalyst stability test.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115239"},"PeriodicalIF":5.2,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of altering CO2-conversion on iron-based direct CO2-hydrogenation","authors":"Nicholas S. Featherstone,&nbsp;Eric van Steen","doi":"10.1016/j.cattod.2025.115240","DOIUrl":"10.1016/j.cattod.2025.115240","url":null,"abstract":"<div><div>Direct CO₂-hydrogenation to liquid hydrocarbons is seen as a valuable reaction pathway for using hard-to-mitigate CO₂ emissions to synthesize drop-in sustainable fuels. CO₂-hydrogenation is a complex reaction with much dispute over the reaction mechanism, viz., whether a dual or only a single active site is needed. The conversion-selectivity relationship within direct CO₂-hydrogenation in a slurry phase reactor over an iron-based catalyst is reported on and the prevalence of a single catalytically active site is shown. The effect of conversion on the reaction selectivity can be utilised to maximise the yield of the desired C₂₊ hydrocarbons. Rate-based insights are provided, most notably the strong inhibition of the reaction rate by water formed in-situ, which may be used to further understand and improve the reaction performance. Finally, it is shown that operating a fixed bed reactor outperforms the performance in a slurry phase in terms of catalyst bed activity more than expected based on the flow profile.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115240"},"PeriodicalIF":5.2,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143463779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}