Catalysis Today最新文献_第2页

Hydrogen production from aqueous formic acid solution using Pt/Cs with different preparation methods 不同制备方法下Pt/Cs在甲酸水溶液中制氢

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-23 DOI: 10.1016/j.cattod.2025.115575

Shuka Murakami, Hiroyasu Fujitsuka, Motoaki Kawase

{"title":"Hydrogen production from aqueous formic acid solution using Pt/Cs with different preparation methods","authors":"Shuka Murakami, Hiroyasu Fujitsuka, Motoaki Kawase","doi":"10.1016/j.cattod.2025.115575","DOIUrl":"10.1016/j.cattod.2025.115575","url":null,"abstract":"<div><div>Formic acid is a promising hydrogen carrier because of its high hydrogen content and small enthalpy of dehydrogenation. Hydrogen is generally produced from formic acid via liquid-phase decomposition over catalysts. Catalysts consisting of noble metals that are stable in acidic solutions and carbon supports without acidic sites causing side reactions have several advantages, such as the high activity and ease of separation. To enhance catalytic activity, the surface area of the active metal should be increased. However, conventional impregnation methods are not completely suitable for this purpose because of the weak metal–carbon interactions. To solve this problem, a preparation method using an ion-exchange resin as a precursor for the carbon support was employed. In this study, we investigated the effect of the preparation method of carbon-supported Pt catalysts on their catalytic activity for the liquid-phase decomposition of formic acid. The catalysts prepared from ion-exchange resins exhibited Pt loadings of approximately 26–28 wt% and Pt particle sizes of 2–3 nm; therefore, this method can realize a higher dispersion degree of Pt nanoparticles than an impregnation method. Moreover, the produced catalysts demonstrated a higher activity for the dehydrogenation of formic acid than those of the catalysts prepared by the impregnation method. Additionally, the carbonization temperature strongly affected the catalyst properties, such as the pore size and metal accessibility. Consequently, the catalyst activity for the decomposition of formic acid varied depending on the carbonization temperature. We also formulated a new reaction model considering hydrogen adsorption.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115575"},"PeriodicalIF":5.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155984","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}

引用次数: 0

Enhancing CO2 hydrogenation via spatially engineered bifunctional catalysts: Toward selective C8–10 aromatics for sustainable aviation fuel 通过空间工程双功能催化剂增强CO2加氢：面向可持续航空燃料的选择性C8-10芳烃

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-23 DOI: 10.1016/j.cattod.2025.115574

Hyeonji Yeom, Yongseok Kim, Hanbit Jang, Jongmin Park, Seongeun Kim, Kyungsu Na

{"title":"Enhancing CO2 hydrogenation via spatially engineered bifunctional catalysts: Toward selective C8–10 aromatics for sustainable aviation fuel","authors":"Hyeonji Yeom, Yongseok Kim, Hanbit Jang, Jongmin Park, Seongeun Kim, Kyungsu Na","doi":"10.1016/j.cattod.2025.115574","DOIUrl":"10.1016/j.cattod.2025.115574","url":null,"abstract":"<div><div>The direct CO<sub>2</sub> hydrogenation into liquid-phase hydrocarbons offers a sustainable route for carbon recycling, yet achieving high selectivity toward sustainable aviation fuel-range aromatic compounds remains challenging. Here, we report a bifunctional catalyst system composed of FeK-loaded CuAl<sub>2</sub>O<sub>4</sub>-based catalyst (FeK/CAO) and a nanosheet MFI-type zeolite (NS-HMFI) with hierarchical porosity for the selective production of C<sub>8–10</sub> aromatic hydrocarbons. Structural and compositional characterizations confirmed the mesoporous architecture and strong acidity of NS-HMFI and the multifunctional activity of FeK/CAO in CO<sub>2</sub> activation and C–C coupling. By engineering the spatial proximity between the two catalysts through four integration methods such as physical mixture (PM), granule mixture (GM), dual-bed system (DB), and multi-bed system (MB), we elucidated the relationship between proximity and catalytic performance. Among the systems tested, the GM system achieved the highest CO<sub>2</sub> conversion (39.2 %) with the lowest CO selectivity (13.0 %) due to enhanced CO<sub>2</sub> adsorption and dissociation facilitated by potassium migration and increased surface basicity. Conversely, the DB system, with minimal catalyst proximity, promoted the highest aromatic distribution and enabled selective conversion of light olefins into C<sub>8–10</sub> aromatics. All systems integrating NS-HMFI showed >95 % distribution for C<sub>8–10</sub> aromatics among total aromatics, highlighting the critical role of external acid sites in mesoporous zeolites. This work demonstrates a proximity-controlled catalytic approach for efficient CO<sub>2</sub> hydrogenation to SAF-range aromatics and provides mechanistic insights into the design of multifunctional hybrid catalysts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115574"},"PeriodicalIF":5.3,"publicationDate":"2025-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154914","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}

引用次数: 0

Preparation and application of film-like mesoporous MgO-supported Cu-Zn-Co trimetallic catalyst for selective hydrogenation of furfural to furfuryl alcohol 膜状介孔mgo负载Cu-Zn-Co三金属催化剂的制备及应用

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-22 DOI: 10.1016/j.cattod.2025.115577

Zihuai Xu , Jiasheng Wang , Xiujuan Feng , Sheng Zhang , Xiaoqiang Yu , Xuan Zhang , Ming Bao

{"title":"Preparation and application of film-like mesoporous MgO-supported Cu-Zn-Co trimetallic catalyst for selective hydrogenation of furfural to furfuryl alcohol","authors":"Zihuai Xu , Jiasheng Wang , Xiujuan Feng , Sheng Zhang , Xiaoqiang Yu , Xuan Zhang , Ming Bao","doi":"10.1016/j.cattod.2025.115577","DOIUrl":"10.1016/j.cattod.2025.115577","url":null,"abstract":"<div><div>A film-like MgO-supported trimetallic catalysts CuZnCo/MgO/CNFs were prepared for selective hydrogenation of furfural into furfuryl alcohol for the first time. The hydrogenation reaction of furfural proceeded smoothly in the presence of the optimal catalyst CuZn<sub>0.125</sub>Co<sub>0.5</sub>/MgO/CNFs under mild conditions to provide the desired product furfuryl alcohol in quantitative yield with nearly 100 % selectivity. The catalyst CuZn<sub>0.125</sub>Co<sub>0.5</sub>/MgO/CNFs could be easily recycled by a magnet due to its magnetic property and reused for several times without deactivation. The structure of the catalyst CuZn<sub>0.125</sub>Co<sub>0.5</sub>/MgO/CNFs was characterized by using various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The high catalytic activity of CuZn<sub>0.125</sub>Co<sub>0.5</sub>/MgO/CNFs is attributed to the synergistic effect of the three metals (Cu, Zn, and Co).</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115577"},"PeriodicalIF":5.3,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154916","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}

引用次数: 0

Low-temperature CO2 hydrogenation to methanol on Cu-doped Au/ZrO2: Effect of Cu doping on hydrogen activation Cu掺杂Au/ZrO2的低温CO2加氢制甲醇：Cu掺杂对氢活化的影响

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-20 DOI: 10.1016/j.cattod.2025.115573

Katsutoshi Nomoto , Yuichiro Okuzumi , Takumi Nakagawa , Hiroki Miura , Tetsuya Shishido

{"title":"Low-temperature CO2 hydrogenation to methanol on Cu-doped Au/ZrO2: Effect of Cu doping on hydrogen activation","authors":"Katsutoshi Nomoto , Yuichiro Okuzumi , Takumi Nakagawa , Hiroki Miura , Tetsuya Shishido","doi":"10.1016/j.cattod.2025.115573","DOIUrl":"10.1016/j.cattod.2025.115573","url":null,"abstract":"<div><div>CO<sub>2</sub> hydrogenation to methanol is one of the most promising routes for CO<sub>2</sub> utilization. In CO<sub>2</sub> hydrogenation, low temperatures and high pressures are thermodynamically favorable for high CO<sub>2</sub> conversion and methanol selectivity. However, owing to the difficulty in activating CO₂ at low temperatures, developing catalysts that function under mild conditions is a significant challenge. In this study, we demonstrate that ZrO₂-supported Au nanoparticles promote the hydrogenation of CO₂ to produce CH₃OH under mild conditions (160 °C, 4 MPa, H₂/CO₂ molar ratio = 3), whereas the conventional Cu-based catalyst shows no activity. Methanol selectivity improved by adding a trace amount of Cu (based on ≤0.3 wt%) to Au/ZrO₂. Compared with Au/ZrO₂, Au–Cu/ZrO₂ maintained a high methanol production rate and suppressed CO production, resulting in improved methanol selectivity. Based on kinetic analysis, <em>in situ</em> infrared spectroscopy, structural characterization, and OH–D<sub>2</sub> exchange, we propose that the addition of a trace amount of Cu to Au/ZrO<sub>2</sub> suppresses CO production via formate decomposition owing to the decrease in the spillover rate of hydrogen from the Au nanoparticles to ZrO<sub>2</sub>, resulting in improved methanol selectivity.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115573"},"PeriodicalIF":5.3,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154912","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}

引用次数: 0

Coupling property-optimized Ru/Beta catalysts with advanced open batch distillation reactors for waste polyethylene hydrocracking Ru/Beta催化剂与先进开放式蒸馏反应器的偶联性能优化

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-20 DOI: 10.1016/j.cattod.2025.115576

Hankyeul Kang, Tae Hoon Lee, Jong Hun Kang

{"title":"Coupling property-optimized Ru/Beta catalysts with advanced open batch distillation reactors for waste polyethylene hydrocracking","authors":"Hankyeul Kang, Tae Hoon Lee, Jong Hun Kang","doi":"10.1016/j.cattod.2025.115576","DOIUrl":"10.1016/j.cattod.2025.115576","url":null,"abstract":"<div><div>Plastic waste, particularly from polyolefins such as polyethylene (PE), poses an escalating environmental burden due to its chemical inertness and volume. Pyrolysis is commercialized process that offers a practical solution for recycling plastic waste, but it is limited by high temperature requirements, substantial energy consumption, and high proportion of olefinic products. Hydrocracking with bifunctional catalysts under optimized conditions presents a promising alternative.</div><div>Here, we developed a property-optimized Ru/Beta catalyst system combined with a pressurized open batch distillation reactor for the selective hydrocracking of waste PE into C<sub>5</sub>–C<sub>30</sub> hydrocarbons. Zeolite Beta supports with varied Si/Al ratios and crystal sizes were synthesized to control Brønsted acid site distribution and external surface area. The controlled properties influenced Ru nanoparticle dispersion, hydrogen activation, and overall catalytic activity. Nano-sized zeolite Beta supports exhibited the highest Ru dispersion and facilitated efficient hydrocracking. The open batch reactor configuration enabled real-time vapor-phase separation of volatile products, minimizing secondary cracking. Under optimized conditions (280 °C, 40 H<sub>2</sub> bar), Ru/nanosized Beta with (Si/Al=10) achieved over an 80 % PE conversion and a 50 % selectivity toward C<sub>5</sub>–C<sub>30</sub> liquid hydrocarbons. Product analysis using GC-FID, GPC, and ¹H NMR confirmed the formation of branched alkanes with a narrow molecular weight distribution in the C<sub>5</sub>–C<sub>15</sub> range. This work underscores the critical role of metal–acid site balance, nanoscale catalyst engineering, and dynamic reactor operation in achieving selective and efficient polyolefin hydrocracking.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115576"},"PeriodicalIF":5.3,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154911","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}

引用次数: 0

Effect of introduced mesopore in TON zeolite on isomerization of oleic acid TON分子筛中引入介孔对油酸异构化的影响

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-19 DOI: 10.1016/j.cattod.2025.115570

Xinyu Wei, Toshiya Tsunakawa, Shaohua She, Mingming Peng, Kenji Kamiya, Eika W. Qian

{"title":"Effect of introduced mesopore in TON zeolite on isomerization of oleic acid","authors":"Xinyu Wei, Toshiya Tsunakawa, Shaohua She, Mingming Peng, Kenji Kamiya, Eika W. Qian","doi":"10.1016/j.cattod.2025.115570","DOIUrl":"10.1016/j.cattod.2025.115570","url":null,"abstract":"<div><div>TON-type zeolite ZSM-22 with meso-microporous was developed by enhancing reactant diffusion and suppressing deactivation through mesoporous structuring, with the aim of investigating the isomerization of oleic acid. A series of meso-microporous ZSM-22 zeolite were synthesized via a desilication–recrystallization method. By adjusting the NaOH solution concentration (x = 0.4–1.0 M), the mesopore size was controlled, and CTAB facilitated the recrystallization of the dissolved silica, which then deposited on the catalyst surface, deactivating the surface acid sites. All samples were thoroughly characterized and evaluated in a continuous flow reactor for their isomerization performance. The catalyst prepared with 0.6 M NaOH (0.6M-Z22) exhibited the highest yield of branched unsaturated fatty acids, reaching 67.1 %, with a significantly suppressed dimer acid yield of only 14.9 % at 260 °C under WHSV = 6h⁻¹ . These results demonstrate that meso-microporous catalysts synthesized under optimal desilication conditions can enhance reactant diffusion within the zeolite channels and improve the yield of desired isomerized products. Also, undergoing moderate desilication, the catalyst's L/B acid sites ratio decreased, resulting in enhanced isomerization capability. Moreover, CTAB facilitated the recrystallization of the dissolved silica, which then deposited on the catalyst surface, deactivating the surface acid sites and suppressing the formation of side reactions. Finally, DTG analysis was performed to evaluate the coke formation on the spent catalysts. A 96-hour long-term durability test was also conducted. After 96 h of continuous operation, the conversion of oleic acid remained above 80 %, and the yield of branched unsaturated fatty acids was maintained at over 50 %.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115570"},"PeriodicalIF":5.3,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154913","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}

引用次数: 0

CO2 methanation over BEA zeolite catalysts: Effect of MgO and in-situ Ni incorporation BEA沸石催化剂上CO2甲烷化：MgO和原位Ni掺入的影响

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-19 DOI: 10.1016/j.cattod.2025.115572

Galal A. Nasser , Akolade I. Bakare , Mohmmed A. Sanhoob , Jan Kopyscinski

{"title":"CO2 methanation over BEA zeolite catalysts: Effect of MgO and in-situ Ni incorporation","authors":"Galal A. Nasser , Akolade I. Bakare , Mohmmed A. Sanhoob , Jan Kopyscinski","doi":"10.1016/j.cattod.2025.115572","DOIUrl":"10.1016/j.cattod.2025.115572","url":null,"abstract":"<div><div>Carbon dioxide methanation is a promising carbon management technology that reduces CO<sub>2</sub> concentrations and facilitates the long-term storage of excess renewable energy, thereby closing the carbon cycle. This study investigates the catalytic performance of BEA zeolite-based catalysts in the methanation of CO<sub>2</sub>, focusing on the role of MgO as a promoter and investigating the incorporation of Ni by in-situ method. The catalysts were synthesized via two methods: post-modification with Ni and MgO loading, and in-situ incorporation of Ni within the zeolite framework. Characterization techniques, including X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), H<sub>2</sub>-TPR, and CO<sub>2</sub>-TPD, were used to evaluate the physical and chemical properties of the catalysts. The results demonstrated that MgO promoted the catalytic activity of BEA zeolites, enhancing CO<sub>2</sub> conversion and methane selectivity at lower reaction temperatures. The in-situ incorporation of Ni showed negligible activity at temperatures below 350 °C but outperformed post-modified catalysts at higher temperatures, particularly above 400 °C. These findings suggest that while post-modified catalysts are more effective at lower temperatures, in-situ Ni incorporation offers superior catalytic performance at elevated temperatures, making it a promising approach for high-temperature methanation reactions. This work contributes to the development of efficient catalysts for CO<sub>2</sub> methanation, supporting carbon capture and utilization efforts.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115572"},"PeriodicalIF":5.3,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145119218","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}

引用次数: 0

Precipitated iron-based catalysts with SiO2/ZnO dual structural promoters for enhanced activity and linear α-olefin selectivity in Fischer-Tropsch synthesis 具有SiO2/ZnO双结构促进剂的沉淀铁基催化剂在费托合成中增强活性和α-烯烃的线性选择性

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-19 DOI: 10.1016/j.cattod.2025.115566

Gyoung Woo Lee , Kwang Young Kim , Geun Bae Rhim , Young Eun Kim , Yeon Hee Ro , Hyeon Song Lee , Min Hye Youn , Kwan-Young Lee , Dong Hyun Chun

{"title":"Precipitated iron-based catalysts with SiO2/ZnO dual structural promoters for enhanced activity and linear α-olefin selectivity in Fischer-Tropsch synthesis","authors":"Gyoung Woo Lee , Kwang Young Kim , Geun Bae Rhim , Young Eun Kim , Yeon Hee Ro , Hyeon Song Lee , Min Hye Youn , Kwan-Young Lee , Dong Hyun Chun","doi":"10.1016/j.cattod.2025.115566","DOIUrl":"10.1016/j.cattod.2025.115566","url":null,"abstract":"<div><div>Fischer-Tropsch synthesis (FTS) was carried out over industrially important precipitated Fe/Cu/K-based catalysts with three different types of structural promoters: ZnO, SiO<sub>2</sub>, and their combination (SiO<sub>2</sub>/ZnO). The dual structural promotion of SiO<sub>2</sub> and ZnO was effective in enhancing the physicochemical properties of the catalysts. The SiO<sub>2</sub>/ZnO-incorporated catalysts, Fe/Cu/K/SiO<sub>2</sub>/ZnO, not only exhibited improved physical properties (i.e., smaller crystallites and higher surface area) than the ZnO-incorporated catalysts, Fe/Cu/K/ZnO, but also enhanced reducibility and CO-dissociation ability compared to the SiO<sub>2</sub>-incorporated catalysts, Fe/Cu/K/SiO<sub>2</sub>. The improved physicochemical properties of Fe/Cu/K/SiO<sub>2</sub>/ZnO resulted in catalytic performance superior to that of Fe/Cu/K/ZnO and Fe/Cu/K/SiO<sub>2</sub>. Whereas Fe/Cu/K/ZnO suffered from severe deactivation, Fe/Cu/K/SiO<sub>2</sub>/ZnO displayed relatively high and stable CO conversion. Furthermore, both the CO conversion and the linear α-olefin (LAO) selectivity of Fe/Cu/K/SiO<sub>2</sub>/ZnO (87.1 % and 59.6 wt%) were higher than those of Fe/Cu/K/SiO<sub>2</sub> (75.4 % and 56.7 wt%). Considering that a trade-off relationship exists between CO conversion and LAO selectivity, this strongly demonstrates an appreciable feature of dual structural promotion in the precipitated iron-based catalysts for FTS.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115566"},"PeriodicalIF":5.3,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145154915","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}

引用次数: 0

Operando IR of catalytic reactions under microwaves at 5.8 GHz 5.8 GHz微波下催化反应的Operando IR

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-18 DOI: 10.1016/j.cattod.2025.115571

Frédéric Thibault-Starzyk , Ana Neto , Sébastien Thomas , Carlos Henriques , Gary Bond

引用次数: 0

The effect of mechanochemical mixing conditions on V2O5/WO3-TiO2 and zeolite Y hybrid catalyst for selective catalytic reduction of NOx with NH3 机械化学混合条件对V2O5/WO3-TiO2与沸石Y杂化催化剂选择性NH3催化还原NOx的影响

IF 5.3 2区化学

Catalysis Today Pub Date : 2025-09-17 DOI: 10.1016/j.cattod.2025.115568

Hyun Sub Kim , Se Won Jeon , Hongbeom Park , Inhak Song , Do Heui Kim

{"title":"The effect of mechanochemical mixing conditions on V2O5/WO3-TiO2 and zeolite Y hybrid catalyst for selective catalytic reduction of NOx with NH3","authors":"Hyun Sub Kim , Se Won Jeon , Hongbeom Park , Inhak Song , Do Heui Kim","doi":"10.1016/j.cattod.2025.115568","DOIUrl":"10.1016/j.cattod.2025.115568","url":null,"abstract":"<div><div>V<sub>2</sub>O<sub>5</sub>/WO<sub>3</sub>-TiO<sub>2</sub> (VWTi) catalysts are widely utilized in selective catalytic reduction with NH<sub>3</sub> (NH<sub>3</sub>-SCR) for stationary sources. However, their susceptibility to ammonium bisulfate (ABS) formation due to the presence of SO<sub>2</sub> and H<sub>2</sub>O in flue gases poses a significant challenge. Improving the removal of ABS formed on VWTi catalysts can enhance their SO<sub>2</sub> resistance, and zeolites with strong acid sites are promising materials for trapping ABS. To optimize the interaction between VWTi catalysts and zeolites, two sample preparation methods were evaluated in this work: hand-mixing and ball milling. This study investigates the catalytic activity and SO<sub>2</sub> resistance of these samples to evaluate the effectiveness of the mixing techniques. The sample mixed using a mixer mill (20 Hz, 10 min) exhibited superior NO<sub>x</sub> conversion and SO<sub>2</sub> resistance compared to the hand-mixed VWTi and zeolite Y sample. This improvement in catalytic performance was attributed to the preservation of the TiO<sub>2</sub> particle during the ball milling process, coupled with partial fragmentation of the zeolite that facilitated intimate contact between mixed particles. In contrast, extending this approach to a MnO<sub>x</sub> + zeolite Y hybrid system revealed no synergistic effect, as the MnO<sub>x</sub> active material suffered structural damage during the ball milling process. These findings underscore the importance of ensuring that the active material maintains its structural integrity while allowing the ABS-trapping material to undergo controlled fragmentation. Such balance is crucial for maximizing the intimate contact between components and achieving optimal catalytic performance.</div></div>","PeriodicalId":264,"journal":{"name":"Catalysis Today","volume":"462 ","pages":"Article 115568"},"PeriodicalIF":5.3,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145106190","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}

引用次数: 0