Catalysis Letters最新文献_第10页

Catalytic Conversion of Diketene to Aromatics on the Beta Zeolite 二烯酮在β沸石上催化转化为芳烃

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-07-02 DOI: 10.1007/s10562-026-05447-9

Tianle Yang, Yang Zhang, Xiaodi Lei, Lixia Ling, Riguang Zhang, Baojun Wang

{"title":"Catalytic Conversion of Diketene to Aromatics on the Beta Zeolite","authors":"Tianle Yang, Yang Zhang, Xiaodi Lei, Lixia Ling, Riguang Zhang, Baojun Wang","doi":"10.1007/s10562-026-05447-9","DOIUrl":"10.1007/s10562-026-05447-9","url":null,"abstract":"<div><p>Catalytic conversion of biomass‑derived diketene into aromatics represents a novel and economical pathway for aromatics production. Aromatic selectivity of 50.4% is achieved at 21.0% diketene conversion over Beta zeolite, with benzene, toluene, and xylenes (BTX) constitute 99.2% of the total aromatic products. The aromatic selectivity over Beta zeolite (Si/Al = 14) is higher than that over MCM-22(35.6%) and ZSM-11(38.5%) zeolites. Beta (14) zeolite possesses a larger micropore surface area and micropore volume than MCM-22 and ZSM-11, which favor the formation of aromatics. A decrease in the Si/Al ratio of Beta zeolites leads to an increase in the density of weak acid sites, which in turn enhances the selectivity toward aromatics and BTX. The conversion of diketene to aromatics likely involves acetyl group and ketene intermediate, which may be converted into hydrocarbons. Light olefins (C<sub>2</sub>-C<sub>4</sub> olefins) are the primary hydrocarbon products, which may be transformed into aromatics and alkanes via hydrogen transfer. This study provides a novel reaction pathway for the production of aromatics from diketene over zeolites.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Magnetic Combined Cross-Linked Enzyme Aggregates of Glutamate Oxidase and Catalase by Macromolecular Cross-Linker for Synthesis of α-Ketoglutaric Acid 谷氨酸氧化酶和过氧化氢酶的磁性组合交联聚合大分子交联剂合成α-酮戊二酸

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-07-01 DOI: 10.1007/s10562-026-05451-z

Shumao Yang, Minsong Zhang, Peng Liu, Linxuan Kang, Jiandong Cui

{"title":"Magnetic Combined Cross-Linked Enzyme Aggregates of Glutamate Oxidase and Catalase by Macromolecular Cross-Linker for Synthesis of α-Ketoglutaric Acid","authors":"Shumao Yang, Minsong Zhang, Peng Liu, Linxuan Kang, Jiandong Cui","doi":"10.1007/s10562-026-05451-z","DOIUrl":"10.1007/s10562-026-05451-z","url":null,"abstract":"<div><p>Cascade catalysis of glutamate oxidase (GLOX) and catalase (CAT) is an important one-pot synthetic route for α-ketoglutarate (α-KG) production. However, as the soluble natural proteins, the instability of free GLOX and CAT and the difficulty of recycling severely limits its application. Here, magnetic dual-enzyme cross-linked enzyme aggregates (combi-CLEAs) of GLOX and CAT were successfully prepared with amino-functionalized Fe<sub>3</sub>O<sub>4</sub> magnetic nanoparticles as the carrier by a macromolecular cross-linking agent. Preparation conditions of the combi-CLEAs were systematically optimized. The highest activity recovery of combi-CLEAs reached 81% under the optimized conditions. Meanwhile, the combi-CLEAs exhibited high stability than free enzymes, including temperature tolerance, pH tolerance, and storage capacity. After incubation at 80 °C for 30 min, the magnetic combi-CLEAs retained 25% of its initial activity whereas the free enzymes maintained only 10%. Moreover, after 6 cycles of use, the combi-CLEAs maintained 74% of its initial activity, indicating excellent reusability. In particular, the combi-CLEAs exhibited high substrate tolerance and conversion efficiency of L-glutamate to α-KG. The total α-KG yield by combi-CLEAs after 6 cycles of use was 5.8 times higher than that of the free enzyme system.</p></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 of Highly Active CO-Oxidation Catalysts Based on Cobalt Prussian Blue Analogues 基于普鲁士蓝钴类似物的高活性co -氧化催化剂的制备

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-30 DOI: 10.1007/s10562-026-05455-9

Tobias Günther, Stephan Feser, Andreas Roppertz, David Poppitz, Thomas Hahn, Dirk Enke

{"title":"Preparation of Highly Active CO-Oxidation Catalysts Based on Cobalt Prussian Blue Analogues","authors":"Tobias Günther, Stephan Feser, Andreas Roppertz, David Poppitz, Thomas Hahn, Dirk Enke","doi":"10.1007/s10562-026-05455-9","DOIUrl":"10.1007/s10562-026-05455-9","url":null,"abstract":"<div><p>A simple method to synthesize catalytically active, noble metal free cobalt ferrites with mesopores and high activity for CO-oxidation at low temperatures will be presented in the following work. Fe<sub>4</sub>[Fe(CN)<sub>6</sub>]<sub>3</sub> (Prussian blue, PB) and Co<sub>3</sub>[Fe(CN)<sub>6</sub>]<sub>2</sub> (Co- Prussian blue-analogue, PBA) are first synthesized by a co-precipitation reaction and subsequently heat treated to form the catalytically active oxide CoFe<sub>2</sub>O<sub>4</sub>. Solvent modification with DMF and a salt-filler-calcination method with MgSO<sub>4</sub> will be employed for the first time to modify and protect the pore system of CoFe<sub>2</sub>O<sub>4</sub>. The as obtained mesoporous material has a specific surface area of 76 m<sup>2</sup> g<sup>− 1</sup>, pore sizes ranging from 10 to 70 nm and a specific mesopore volume of 0.4 cm<sup>3</sup> g<sup>− 1</sup>. In a fixed bed-setup with dry air, the material shows 90% CO-conversion (T<sub>90</sub>) at room temperature. When coating the catalyst onto a honeycomb support and using moisture containing air, T<sub>90</sub> of 320 °C can be achieved, remaining constant or increasing to 380 °C after hydrothermal or SO<sub>2</sub>-aging respectively. Noble metal free CO-oxidation catalysts, still active after exposure to H<sub>2</sub>O and SO<sub>2</sub>, can thus be synthesized by a simple and cost-efficient method.</p><h3>Graphical Abstract</h3><p>CoFe<sub>2</sub>O<sub>4</sub> is prepared via Prussian Blue/Prussian Blue Analogue (PB/PBA) co-precipitation method with subsequent calcination. Mesopores within the structure are preserved by using a pore-filling salt during calcination. CoFe<sub>2</sub>O<sub>4</sub> is used as a CO-oxidation catalyst that remains active even avert exposure to water and SO<sub>2</sub>.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-026-05455-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improved Catalysis of Porcine Pancreas Lipase Adsorbed on Wheat Bran 猪胰腺脂肪酶在麦麸上吸附的改进催化作用

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-30 DOI: 10.1007/s10562-026-05456-8

Yingchao Wang, Lu Chen, Fangdi Cong, Liyao Liu, Wei Yang, Chang Li, Xinyang Gao, Huiyi Jin, Yanling Xu, Zhaowang Shen

{"title":"Improved Catalysis of Porcine Pancreas Lipase Adsorbed on Wheat Bran","authors":"Yingchao Wang, Lu Chen, Fangdi Cong, Liyao Liu, Wei Yang, Chang Li, Xinyang Gao, Huiyi Jin, Yanling Xu, Zhaowang Shen","doi":"10.1007/s10562-026-05456-8","DOIUrl":"10.1007/s10562-026-05456-8","url":null,"abstract":"<div><p>To enhance catalytic performance of porcine pancreas lipase, it was immobilized on wheat bran powder as a carrier using physical adsorption between enzyme protein and bran cellulose in a column glass bottle. In the transesterification of n-hexanol and vinyl acetate for 8 h at 37℃ and 160 rpm, the immobilized lipase behaved desired activity when the mass ratio of enzyme to wheat bran was 10 : 30 (mg : mg), being a 12.8-fold increase compared to 10 mg of native lipase. By approximate estimation, the loading capacity and immobilization yields of this immobilized lipase were 313.3 mg/g and 94%, respectively. In the transesterification, the expressed activity of this immobilized lipase, relative to native lipase, was 1443%, based on the initial conversion within the first 4 h. And the immobilized lipase converted hexanol exceeded 96% at 37℃ and 160 rpm after 48 h, whereas the native lipase achieved only 13%. Even after five cycles of 8-hour reactions, the immobilized enzyme retained an activity converting 10% of substrate, while the native lipase maintained only 0.3% substrate conversion capability. In the hydrolysis of soybean oil and peanut oil, the immobilized lipase exhibited hydrolysis rates approximately 1.9-fold and 3.8-fold those of the native lipase, respectively. These results demonstrate that wheat bran as a carrier can significantly enhance the transesterification and hydrolysis activities of this lipase, indicating its great potential for applications such as a nonaqueous catalyst or a feed additive to improve fat digestion in animals.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Production of Biodiesel from Jatropha Oil Using NaOH/Chitosan Fe3O4 Heterogenous Catalyst NaOH/壳聚糖Fe3O4多相催化剂催化麻疯树油制备生物柴油

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-29 DOI: 10.1007/s10562-026-05454-w

S. Swetha, Greeshma Praveen, Abaya Pradhan Yadav, Sindhu Subramanian

{"title":"Production of Biodiesel from Jatropha Oil Using NaOH/Chitosan Fe3O4 Heterogenous Catalyst","authors":"S. Swetha, Greeshma Praveen, Abaya Pradhan Yadav, Sindhu Subramanian","doi":"10.1007/s10562-026-05454-w","DOIUrl":"10.1007/s10562-026-05454-w","url":null,"abstract":"<div><p>With growing concern over energy shortages and environmental pollution, alternative sustainable fuels have been explored to meet these demands. One among these being biodiesel, a fuel made from non-edible oil. In this study, <i>Jatropha oil</i> was considered and studied due to its high lipid content. For the transesterification process, NaOH/Chitosan-Fe<sub>3</sub>O<sub>4</sub>, a heterogeneous catalyst was selected for the production of biodiesel. The produced biodiesel was characterized to analyse the presence of methyl ester groups by GC-MS, FT-IR and NMR. Optimization of parameters was done by varying the oil-to-methanol ratio, catalyst loading percentage, and the time while maintaining constant temperature. The maximum biodiesel yield of 89.50% was obtained at an Oil: Methanol ratio of 1:12, 1wt% catalyst and at 3 h. The Langmuir Hinshelwood model was considered a suitable model compared to the other kinetic models used in this study based on the linearity. It was also identified that internal and external mass transfer limitations were negligible and surface reaction was the rate determining step. Based on the results obtained, it was concluded that biodiesel was efficiently formed by the process of transesterification using the synthesized heterogeneous catalyst and had a maximum recyclability of 3.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Catalyst synthesis, characterization and biodiesel production</p></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Selective Oxidation of Methanol to Green Oxygenates: Influence of Calcination Temperature on a (:text{V}{text{O}}_{text{x}}text{/Ti}{text{O}}_{text{2}}) Catalyst 甲醇选择性氧化制绿色氧合物：煅烧温度对(:text{V}{text{O}}_{text{x}}text{/Ti}{text{O}}_{text{2}})催化剂的影响

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-26 DOI: 10.1007/s10562-026-05448-8

Jan Paul Walter, Lukas Matthies, Tanya Wolff, Michael Schwidder, Christof Hamel

{"title":"Selective Oxidation of Methanol to Green Oxygenates: Influence of Calcination Temperature on a (:text{V}{text{O}}_{text{x}}text{/Ti}{text{O}}_{text{2}}) Catalyst","authors":"Jan Paul Walter, Lukas Matthies, Tanya Wolff, Michael Schwidder, Christof Hamel","doi":"10.1007/s10562-026-05448-8","DOIUrl":"10.1007/s10562-026-05448-8","url":null,"abstract":"<div><p>Various VO<sub>x</sub>/TiO<sub>2</sub> catalysts were prepared by equilibrium adsorption and calcined at different temperatures between 300 and 600 °C for performing the heterogeneously catalyzed selective methanol oxidation to oxygenates. The influence of calcination temperature on catalyst morphology and characteristics was studied by N<sub>2</sub> sorption (BET and BJH), TPD, TPR, SEM, XRD, and UV-Vis diffusive reflectance spectra measurements. The effect on catalytic activity was investigated by experiments in a laboratory scale fixed bed reactor. It was found that the temperature of calcining has a significant influence on catalyst structure and performance due to a phase transition of the TiO<sub>2</sub> support from anatase to rutile and, consequently, sintering effects, resulting in a loss of surface area, active sites, and catalytic activity. The catalyst calcined at 400 °C offered the overall best performance with a maximum yield of methyl formate of 64%, dimethoxymethane of 23%, and dimethyl ether of 2%, providing a sustainable way to produce green oxygenates by heterogeneous catalysis in the gas phase.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-026-05448-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ZnCaAl Composite Oxide Catalyzes Cycloaddition of CO2 with Propylene Oxide to Produce Propylene Carbonate 氧化锌铝复合氧化物催化CO2与环氧丙烷环加成制碳酸丙烯酯

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-26 DOI: 10.1007/s10562-026-05459-5

Shuyi Li, Shuangming Li, Haiyang Yu, Yinong Li, Sansan Yu

{"title":"ZnCaAl Composite Oxide Catalyzes Cycloaddition of CO2 with Propylene Oxide to Produce Propylene Carbonate","authors":"Shuyi Li, Shuangming Li, Haiyang Yu, Yinong Li, Sansan Yu","doi":"10.1007/s10562-026-05459-5","DOIUrl":"10.1007/s10562-026-05459-5","url":null,"abstract":"<div><p>A series of ZnCaAl composite oxide catalysts were synthesized via a rapid and straightforward spray-drying method. The crystalline structure, morphology, specific surface area, and surface basicity of the catalysts were systematically characterized by XRD, SEM, BET, and CO<sub>2</sub>-TPD. Results demonstrate that spray-drying significantly enhanced both textural and catalytic properties. For the catalyst with a Zn/Ca molar ratio of 4.0, the specific surface area increased from 35 m<sup>2</sup>/g to 93 m<sup>2</sup>/g compared to its non-spray-dried counterpart, accompanied by a pronounced increase in propylene carbonate selectivity. The resulting spherical morphology and high surface area jointly promoted active-site exposure, facilitating propylene oxide ring-opening and CO<sub>2</sub> adsorption, thereby driving the cycloaddition reaction forward. Under the optimized conditions (150 °C, 2.5 MPa, 8 h, with 1.5 mL of triethylamine as co-catalyst), the sample with a Zn/Ca molar ratio of 4.0 exhibited the best catalytic performance among the tested catalysts with varying molar ratios, achieving 95.89% conversion of propylene oxide and 81.38% selectivity of propylene carbonate.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

NiP/NFF Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Water Splitting NiP/NFF纳米片阵列作为水分解的高效双功能电催化剂

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-25 DOI: 10.1007/s10562-026-05457-7

Deyu Xu, Kuidong Wang, Jun Liu, Aixiang. Wei

{"title":"NiP/NFF Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Water Splitting","authors":"Deyu Xu, Kuidong Wang, Jun Liu, Aixiang. Wei","doi":"10.1007/s10562-026-05457-7","DOIUrl":"10.1007/s10562-026-05457-7","url":null,"abstract":"<div><p>Transition metal phosphides (TMPs) are considered as one of the most promising bifunctional electrocatalysts for overall water splitting due to their high activity and low cost. Herein, NiP nanosheet arrays were grown on nickel-iron foam (NFF) substrates by electrodeposition method. The influence of NaH<sub>2</sub>PO<sub>2</sub>·H<sub>2</sub>O concentration on the morphology and electrocatalytic performance of the NiP/NFF arrays was investigated. The optimized catalyst, prepared at a NaH<sub>2</sub>PO<sub>2</sub> concentration of 0.0212 M in the precursor solution, exhibits excellent bifunctional electrocatalytic activity. For the oxygen evolution reaction (OER), it achieves a low overpotential of 303 mV at 100 mA cm<sup>−2</sup> and a small Tafel slope of 36.4 mV dec<sup>−1</sup>. For the hydrogen evolution reaction (HER), it delivers an overpotential of 228 mV at 100 mA cm<sup>−2</sup> and a Tafel slope of 72.3 mV dec<sup>−1</sup>. The electrolytic cell using NiP/NFF as both cathode and anode achieves a voltage of 1.59 V at current density of 10 mA cm<sup>−2</sup>. However, the stability of NiP/NFF under HER conditions is poor due to P leaching, phase transformation under reductive potentials, and the appearance of surface cracks.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Rhodium-Enhanced Reducibility and Coke Resistance in Low-Loading Ni and Co/Al2O3 Catalysts for CO2 Methanation 铑增强低负荷Ni和Co/Al2O3催化剂的还原性和抗焦炭性

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-25 DOI: 10.1007/s10562-026-05438-w

Robinson L. Manfro, Julia Ferrari P. Nascimento, Mariana M. V. M. Souza, Carlos Alberto Chagas

{"title":"Rhodium-Enhanced Reducibility and Coke Resistance in Low-Loading Ni and Co/Al2O3 Catalysts for CO2 Methanation","authors":"Robinson L. Manfro, Julia Ferrari P. Nascimento, Mariana M. V. M. Souza, Carlos Alberto Chagas","doi":"10.1007/s10562-026-05438-w","DOIUrl":"10.1007/s10562-026-05438-w","url":null,"abstract":"<div><p>Low-loading Ni (2.9 wt%) and Co (2.8 wt%) catalysts supported on γ-Al<sub>2</sub>O<sub>3</sub> were promoted with small amounts of Rh (0.8–1.9 wt%) and evaluated for CO<sub>2</sub> methanation under high space velocity (60,000 mL g<sub>cat</sub><sup>−1</sup> h<sup>−1</sup>). A monometallic Rh/Al<sub>2</sub>O<sub>3</sub> catalyst was used as a reference. Rhodium significantly enhances the reducibility of Ni<sup>2+</sup> and Co<sup>3+</sup>/Co<sup>2+</sup> species, lowering reduction temperatures to ~ 240 °C (Ni) and below 570 °C (Co), achieving near-complete reduction (~ 100%) for both bimetallic systems. Despite lower dispersion in the bimetallic catalysts (~ 14–15%) compared to RhAlO (~ 55%), competitive catalytic performance is achieved at elevated temperatures. CO<sub>2</sub>-TPD reveals only weak basic sites for all catalysts, and the significantly lower CO<sub>2</sub> uptake observed for NiRhAlO does not compromise activity, suggesting that the metallic phase primarily governs CO<sub>2</sub> activation. Catalytic tests show that while RhAlO is more active at low temperatures (28% conversion at 250 °C), NiRhAlO and CoRhAlO reach comparable conversions (> 80%) at 450 °C, with CH<sub>4</sub> selectivity above 90% up to 350 °C. All catalysts exhibit high stability over 30 h at 450 °C, with no clear evidence of sintering or carbon deposition, as confirmed by XRD, TGA, and Raman analyses. These results suggest that Rh promotion enables low-loading Ni and Co catalysts to achieve high activity, enhanced reducibility, and high stability under demanding methanation conditions, offering a cost-effective alternative to high-loading or noble-metal-based systems.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"156 7","pages":""},"PeriodicalIF":2.5,"publicationDate":"2026-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-026-05438-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148323434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetically Recoverable Polyoxometalate-Based Ionic Liquid Catalyst for Efficient Oxidative Desulfurization 磁性可回收多金属氧酸盐基离子液体催化剂的高效氧化脱硫研究

IF 2.5 4区化学

Catalysis Letters Pub Date : 2026-06-25 DOI: 10.1007/s10562-026-05463-9

Fanglong Cen, Jiahong Wang, Bing Hu

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