Catalysis Today最新文献

{"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}

{"title":"Revealing the active Cu species in Cu/ZSM-5 catalysts for the selective catalytic oxidation of ammonia","authors":"Sein Hwang,&nbsp;Dong Chan Park,&nbsp;Hyeongdong Jung,&nbsp;Eunwon Lee,&nbsp;Do Heui Kim","doi":"10.1016/j.cattod.2025.115244","DOIUrl":"10.1016/j.cattod.2025.115244","url":null,"abstract":"<div><div>Ammonia slip, a by-product of NH₃ processes, poses significant environmental and health risks, necessitating its removal via the selective catalytic oxidation of ammonia (NH₃-SCO). In this study, a series of Cu/ZSM-5 catalysts with varying Cu loadings was synthesized via ion-exchange, where the 2.1Cu/ZSM-5 catalyst achieved up to 99.5 % NH₃ conversion and 99.4 % N₂ selectivity at 400 °C. To investigate the active Cu sites in the NH₃-SCO reaction, the distribution of the Cu species, quantified using H₂-TPR and EPR analyses, was correlated with the reaction rate, revealing that isolated Cu²⁺ ions exhibited the strongest linear correlation. A controlled experiment involving the selective reduction of Cu²⁺ to Cu⁺ resulted in a significant decrease in the NH₃ conversion, confirming that Cu²⁺ ions are more active than Cu⁺ ions in the NH₃-SCO reaction. The turnover frequency (TOF) calculated based on the number of Cu²⁺ ions remained nearly constant, with a slight increase at higher Cu loadings, confirming the primary role of Cu²⁺ ions in the catalytic oxidation process and the minor contributions of other Cu species. Further NH₃-TPD and <em>in situ</em> DRIFTS analyses demonstrated that Cu ion-exchange provides higher NH₃ adsorption ability, potentially enhancing the activity of the catalysts for the NH₃-SCO. These findings offer valuable insights for developing more efficient Cu/zeolite catalysts for NH₃ removal in industrial applications.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115244"},"PeriodicalIF":5.2,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480684","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":"H2 production from photocatalytic reforming of PET over Pt/TiO2: The role of terephthalic acid","authors":"Luke Roebuck ,&nbsp;Min Hu ,&nbsp;Helen Daly ,&nbsp;Hubertus Warsahartana ,&nbsp;Louise S. Natrajan ,&nbsp;Arthur Garforth ,&nbsp;Carmine D’Agostino ,&nbsp;Marta Falkowska ,&nbsp;Christopher Hardacre","doi":"10.1016/j.cattod.2025.115242","DOIUrl":"10.1016/j.cattod.2025.115242","url":null,"abstract":"<div><div>Photoreforming is a promising method for the conversion of waste materials with simultaneous production of H₂. The use of waste polyethylene terephthalate (PET) as a photoreforming substrate has been previously investigated, however its insolubility in aqueous media and the resistance of the aromatic terephthalate towards conversion are major obstacles. Commonly an alkaline pretreatment step is used to initiate hydrolysis to ethylene glycol and terephthalic acid which promotes H₂ evolution. However, in this work we have found that TPA has both promotional and inhibitory effects by modification of the catalyst surface that depend on the relative concentration of ethylene glycol. Terephthalic acid inhibits the oxidation reactions by scavenging hydroxyl radicals and blocking complexation sites. This leads to lower H₂ evolution compared to the photoreforming of an equivalent concentration of ethylene glycol. Even in trace amounts, terephthalic acid would still inhibit the reaction unless the concentration of ethylene glycol was high enough. Surprisingly, at ethylene glycol concentrations of &gt; 1.2 M, residual terephthalic acid promoted the reaction which is thought to be due to increasing the interaction between ethylene glycol and the catalyst surface but also an increased role of water. On the basis of these results, we suggest that, if PET is to be used as a feedstock for H₂ generation by photoreforming, an initial hydrolysis should be performed after which terephthalic acid is separated for re-use. The remaining hydrolysate may then be used for photoreforming. Furthermore, the ethylene glycol concentration should be maximized in order to overcome the inhibitory effects of residual terephthalic acid.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"452 ","pages":"Article 115242"},"PeriodicalIF":5.2,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454814","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":"Visible-light-driven perovskite carbonaceous photocatalyst using LaNiO3/rGO composite for environmental remediation","authors":"Javeria Sultana ,&nbsp;Shomaila Noureen ,&nbsp;Madeeha Rani ,&nbsp;Iftikhar Ahmad ,&nbsp;Chongqing Wang ,&nbsp;Cui Li ,&nbsp;Aiyeshah Alhodaib ,&nbsp;Amir Waseem","doi":"10.1016/j.cattod.2025.115238","DOIUrl":"10.1016/j.cattod.2025.115238","url":null,"abstract":"<div><div>In this study, the facile hydrothermal method was used to fabricate pristine LaNiO₃ and LaNiO₃/rGO composites. Three composites were prepared by altering small amount of rGO content in the composites. Various characterization techniques were utilized to investigate the physical properties of as-fabricated samples including Powder X-ray diffraction, Scanning electron microscopy, Energy-dispersive X-ray, Raman and Photoluminescence. Band gap energies calculated from UV–visible spectra using Tauc plots of LaNiO₃, and LaNiO₃/rGO were 2.4 eV, and 2.2 eV respectively. Photoluminescence spectrum of LaNiO₃/rGO composite showed the lower peak intensity than pristine LaNiO₃ and rGO, which indicates the enhanced charge separation in charge carriers. The photocatalytic performance of LaNiO₃/rGO composite was evaluated by bisphenol A degradation and Cr(VI) reduction under visible light irradiation. Among all of the synthesized photocatalysts, it was proved that 15 % LaNiO₃/rGO composite was an outstanding photocatalyst for BPA degradation and Cr(VI) reduction than the other reported photocatalysts. The photooxidation activity and stability of LaNiO₃ was enhanced when rGO was incorporated in LaNiO₃. Complete degradation of 20 ppm solution of bisphenol A and reduction of Cr(VI) solutions were achieved in 25 min and 30 min, respectively by using 40 mg of 15 % LaNiO₃/rGO photocatalyst. BPA degradation and Cr(VI) reduction followed the pseudo first-order kinetics. The LaNiO₃/rGO composite exhibited outstanding stability for up to five cycles.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"451 ","pages":"Article 115238"},"PeriodicalIF":5.2,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428653","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":"A comprehensive review of metal-air batteries: Mechanistic aspects, advantages and challenges","authors":"Madhurima Barman ,&nbsp;Manodip Pal ,&nbsp;Rathindranath Biswas ,&nbsp;Arnab Dutta","doi":"10.1016/j.cattod.2025.115229","DOIUrl":"10.1016/j.cattod.2025.115229","url":null,"abstract":"<div><div>The pursuit of higher energy density for electrochemical energy storage systems has directed attention towards rechargeable metal-air battery chemistries, all of which function based on reversible oxygen redox, i.e., oxygen evolution and reduction reactions. This renders electrocatalyst an essential functional component, with the design/development of efficient-cum-stable electrocatalysts assuming enormous importance. However, these battery chemistries have challenges, such as the passivation of catalysts and dendrite growth at the metal anode. In this regard, after introducing the mechanistic aspects of metal-air battery chemistry, in general, the review discusses the chemistries in more specific terms, followed by highlighting the challenges and ways adopted to address them.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"451 ","pages":"Article 115229"},"PeriodicalIF":5.2,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422127","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}