Catalysis Letters最新文献_第6页

Laser-Synthesized Defect-Rich Gold Nanoparticles with Exclusive Strain Effect for Enhanced Electrocatalytic Hydrogen Evolution 具有独占应变效应的激光合成富缺陷金纳米颗粒增强电催化析氢

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-18 DOI: 10.1007/s10562-025-05151-0

Yang Hu, Chao Zhang, Songbai Qiu

{"title":"Laser-Synthesized Defect-Rich Gold Nanoparticles with Exclusive Strain Effect for Enhanced Electrocatalytic Hydrogen Evolution","authors":"Yang Hu, Chao Zhang, Songbai Qiu","doi":"10.1007/s10562-025-05151-0","DOIUrl":"10.1007/s10562-025-05151-0","url":null,"abstract":"<div><p>Introducing lattice defects represents a potent strategy to boost the electrocatalytic performance of metal nanoparticles (NPs) toward the hydrogen evolution reaction (HER). In this work, lattice distortion defect-rich Au NPs (Defect-Au NPs) is prepared via a non-equilibrium laser irradiation method. The lattice distortion defects induced strain effect in Defect-Au NPs could generate more exposed active sites and enhance the adsorption of H* intermediates, synergistically accelerating the reaction kinetics and promoting electrocatalytic HER activity. Leveraging this optimized defect configuration, Defect-Au NPs demonstrate an enhanced HER activity, which achieves a much lower overpotential of 185 mV at 10 mA cm<sup>–2</sup> in 0.5 M H<sub>2</sub>SO<sub>4</sub> compare to Bulk Au (407 mV@10 mA cm<sup>–2</sup>) and Au NPs without lattice defects (Defect free-Au NPs, 317 mV@10 mA cm<sup>–2</sup>). More importantly, Defect-Au NPs also present high electrocatalytic stability for over 50 h at a current density of 50 mA cm<sup>–2</sup> without activity degradation, while post-reaction characterization confirms its structural stability with well-retained lattice distortion and strain. This work pioneers an innovative approach for designing highly efficient electrocatalysts towards diverse applications.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861408","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

Development of an Ethanol Dehydration–Hydrogenation Catalyst for Reducing Hydrogen Content in Methanation Product Gas with High Activity and High Durability 高活性、高耐久性甲醇化产物气体氢还原乙醇脱水加氢催化剂的研制

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-18 DOI: 10.1007/s10562-025-05147-w

Shimpei Norioka, Tomoki Uchiyama, Hirofumi Ohtsuka, Yoshiharu Uchimoto

{"title":"Development of an Ethanol Dehydration–Hydrogenation Catalyst for Reducing Hydrogen Content in Methanation Product Gas with High Activity and High Durability","authors":"Shimpei Norioka, Tomoki Uchiyama, Hirofumi Ohtsuka, Yoshiharu Uchimoto","doi":"10.1007/s10562-025-05147-w","DOIUrl":"10.1007/s10562-025-05147-w","url":null,"abstract":"<div><p>Methanation, the production of methane from CO<sub>2</sub> and hydrogen, is attracting increased attention as a measure to reduce carbon dioxide emissions from fossil fuel combustion. To use methanation product gas as city gas, reducing the amount of hydrogen in the methanation product gas remains a key challenge. To achieve this, a catalytic system has been proposed that uses ethanol, a widely used biofuel, and the hydrogen in methanation product gas to drive the ethanol dehydration–hydrogenation reaction. In this study, we found that the Pd/HSiW/SiO<sub>2</sub> catalyst initially exhibited high activity but gradually lost its activity due to reactions with water vapor contained in the reaction gas, as revealed by various measurements. On the other hand, Pd/WO<sub>3</sub>/ZrO<sub>2</sub>, which initially had relatively low activity and low selectivity, did not degrade after 150 h of continuous activity measurement, and the activity and selectivity of the reaction increased during the test. The increase in the activity of WO<sub>3</sub>/ZrO<sub>2</sub> after hydrogen pretreatment was investigated by NH<sub>3</sub>-TPD, and it was concluded that this increase was due to an increase in the solid acid strength caused by hydrogen in the gas. These results indicate that Pd/WO<sub>3</sub>/ZrO<sub>2</sub> is both highly active and highly durable for dehydration–hydrogenation of ethanol and is suitable for practical applications.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144861386","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

Ru/MgO Catalyst for Narrow-Distribution Fatty Alcohol Ethers: Enhanced Efficiency and Recyclability in Ethoxylation Ru/MgO窄分布脂肪醇醚催化剂：提高乙氧基化效率和可回收性

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-15 DOI: 10.1007/s10562-025-05133-2

Wei Tian, Gaowu Qin, Jun Zhou

{"title":"Ru/MgO Catalyst for Narrow-Distribution Fatty Alcohol Ethers: Enhanced Efficiency and Recyclability in Ethoxylation","authors":"Wei Tian, Gaowu Qin, Jun Zhou","doi":"10.1007/s10562-025-05133-2","DOIUrl":"10.1007/s10562-025-05133-2","url":null,"abstract":"<div><p>The study examined the potential of the Ru/MgO catalyst for the ring-opening of ethylene oxide (EO) and its application in the synthesis of ethoxylated products. This is the first time that Ru/MgO catalyst has been applied to the ring-opening reaction of ethylene oxide for the synthesis of narrow-distribution fatty alcohol ethers, providing a new catalytic solution for this field. During the ethoxylation reaction, although the induction period of Ru/MgO catalyst is relatively longer than that of potassium hydroxide and magnesium/aluminum catalysts, its small usage leads to the highest catalytic efficiency and does not have any adverse effects on the content of dioxane and polyethylene glycols (PEG) in the final product. The results of gas phase distribution determination of component composition indicate that the catalyst has a significant narrow distribution effect. The content of unreacted alcohols in fatty alcohol polyoxyethylene ether (AEO) is only 7.64% (AEO3-3), which is 57% lower than the 17.66% in traditional potassium hydroxide. The composition content of the target product 3EO has increased from 14.78% to 27.13%, an increase of 83.5%. The optimal number of cycles for the Ru/MgO catalyst is 5. After use, the product does not contain metal ions, and the catalyst does not require refined filtration and separation. The Ru/MgO catalyst can not only synthesize AEO3 (atty alcohol polyoxyethylene ether with 3EO) with lower moles of ethylene oxide, but also synthesize higher molecular weight AEO7 (atty alcohol polyoxyethylene ether with 7EO) and AEO9 (atty alcohol polyoxyethylene ether with 9EO), demonstrating its potential for industrial applications in enhancing product diversity and meeting different industrial needs.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144853575","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

Effect of Dissolved Carbon on Activation of Methane on Palladium: Experimental and Theoretical Study 溶解碳对甲烷活化钯的影响：实验与理论研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-14 DOI: 10.1007/s10562-025-05140-3

Vasily V. Kaichev, Svetlana S. Laletina, Zakhar S. Vinokurov, Elena A. Shor, Ilya V. Yudanov

{"title":"Effect of Dissolved Carbon on Activation of Methane on Palladium: Experimental and Theoretical Study","authors":"Vasily V. Kaichev, Svetlana S. Laletina, Zakhar S. Vinokurov, Elena A. Shor, Ilya V. Yudanov","doi":"10.1007/s10562-025-05140-3","DOIUrl":"10.1007/s10562-025-05140-3","url":null,"abstract":"<div><p>Using experimental and theoretical methods, we studied the dissolution of carbon in near-surface layers of palladium, the formation of palladium carbide and its reactivity toward oxygen. By studying self-sustained oscillations during the oxidation of methane over Pd foil by X-ray diffraction and mass spectrometry, we found that the formation of palladium carbide proceeds simultaneously with a sharp increase in catalytic activity. However, ab initio calculations indicated that the dissolution of carbon in near-surface layers of palladium leads to increasing activation barriers of methane decomposition steps. For example, for the hydrogen abstraction from CH adsorbed species, the activation barrier increases from 54 to 80 kJ/mol. Since the C–H bond breaking activity is the limiting factor in the hydrocarbon oxidation, such increase means that the formation of palladium carbide leads to a decrease in the catalytic activity. Therefore, the formation of palladium carbide is a result of high activity of metallic palladium in the methane decomposition; the carbon formed in this case can not only accumulate on the surface, but also dissolve in the near-surface layers of palladium; both processes reduce the activity of palladium.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832121","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

Optimization of Heterogeneous Transesterification of Non-Food Sources To Produce Biodiesel 非食物源非均相酯交换制备生物柴油的优化研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-14 DOI: 10.1007/s10562-025-05145-y

Miroslava Bérešová, Tomáš Ondrovič, Ema Pavlína Kovárová, Michal Horňáček

{"title":"Optimization of Heterogeneous Transesterification of Non-Food Sources To Produce Biodiesel","authors":"Miroslava Bérešová, Tomáš Ondrovič, Ema Pavlína Kovárová, Michal Horňáček","doi":"10.1007/s10562-025-05145-y","DOIUrl":"10.1007/s10562-025-05145-y","url":null,"abstract":"<div><p>The paper is focused on the optimization of reaction conditions to produce biodiesel by heterogeneous transesterification over Ni-Mg/Al mixed oxide. Preparation of biodiesel by the commonly used homogeneous transesterification produces a large amount of wastewater and other disadvantages like soap formation, difficult separation, polluted glycerin, and limitation of the catalyst used due to the content of free fatty acids. Heterogeneous transesterification offers easier separation and the possibility of reusing catalysts. As an oil source of vegetable oil, non-food plant Camelina sativa was used. Ni-Mg/Al mixed oxide was obtained from hydrotalcite, prepared by co-precipitation. The catalyst was characterized by different techniques to measure basicity, acidity, crystalline structure, and textural properties. The novelty lies in the complex optimization of reaction conditions (ratio of methanol to oil, amount of catalyst to oil, reaction temperature, reaction pressure, reaction time) to obtain a high content of FAME in biodiesel due to the European standard and in the introduction of two-step transesterification from an unconventional source. Transesterification was carried out in a batch reactor. Optimal reaction conditions to obtain the content of FAME in biodiesel higher than 96.4 wt% were the reaction temperature of 140 °C, for 7 h with a molar ratio of methanol to oil of 18/1, an amount of catalyst 3 wt%, and a pressure before reaction of 0.5 MPa(g) for one-step transesterification. For two-step transesterification, two reactions for 3 h at 140 °C, a molar ratio of 18/1, and 3 wt% of catalyst reached FAME content more than 97%.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10562-025-05145-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832124","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

Comparative Study on the CO Oxidation Performance and SO2 Resistance of Au/CeMOx (M = Cu, Zr, Mo) Catalysts Au/CeMOx （M = Cu, Zr, Mo）催化剂CO氧化性能及抗SO2性能的比较研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-13 DOI: 10.1007/s10562-025-05143-0

Meidan Han, Zehao Guo, Xuefeng She, Zhuo Zhang, Qingguo Xue

{"title":"Comparative Study on the CO Oxidation Performance and SO2 Resistance of Au/CeMOx (M = Cu, Zr, Mo) Catalysts","authors":"Meidan Han, Zehao Guo, Xuefeng She, Zhuo Zhang, Qingguo Xue","doi":"10.1007/s10562-025-05143-0","DOIUrl":"10.1007/s10562-025-05143-0","url":null,"abstract":"<div><p>Three kinds of mesoporous Au/CeMO<sub>x</sub> (M = Cu, Zr, Mo) catalysts were prepared by the hydrothermal method (HT) and precipitation method. The prepared catalysts were evaluated for their performance in CO oxidation and SO<sub>2</sub> resistance. Among the three metal-modified catalysts, Cu exhibited the most significant enhancement in CO oxidation activity, which can be attributed to its high BET surface area, large average pore volume, excellent reducibility, and abundant surface-adsorbed oxygen (O<sub>II</sub>). However, under SO<sub>2</sub> exposure, the deactivation rate of the catalysts followed the order: Au/CeMoO<sub>x</sub> < Au/CeZrO<sub>x</sub> < Au/CeO<sub>x</sub> < Au/CeCuO<sub>x</sub>, indicating that Mo modification provided the greatest resistance to SO<sub>2</sub> poisoning. This enhanced stability was primarily ascribed to the role of Mo in modulating surface acidity and specific surface area, which inhibited SO<sub>2</sub> adsorption and the subsequent formation of SO<sub>4</sub><sup>2−</sup> species, as evidenced by SO<sub>2</sub>-TPD and FTIR analysis. The investigation of CO oxidation on both fresh and SO<sub>2</sub>-treated Au/CeMO<sub>x</sub> catalysts provides valuable insights for their potential industrial applications.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832314","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

Green Synthesis of Co3O4 Catalysts Using Jasmine Flower Extract for the Effective Hydrolysis of NaBH4 用茉莉花提取物绿色合成Co3O4催化剂以有效水解NaBH4

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-13 DOI: 10.1007/s10562-025-05124-3

Ebtesam Hassan, Tarek T. Ali, Bahaa M. Abu-Zied

{"title":"Green Synthesis of Co3O4 Catalysts Using Jasmine Flower Extract for the Effective Hydrolysis of NaBH4","authors":"Ebtesam Hassan, Tarek T. Ali, Bahaa M. Abu-Zied","doi":"10.1007/s10562-025-05124-3","DOIUrl":"10.1007/s10562-025-05124-3","url":null,"abstract":"<div><p>Green synthesis is an important route in the preparation of bare metals and metal oxides that provides cost-effective, eco-friendly, and highly efficient catalysts for catalyzing various reactions. In this paper we report, for the first time, the green synthesis of Co<sub>3</sub>O<sub>4</sub> employing jasmine flower extract as a green precursor for the application as catalyst during NaBH<sub>4</sub> hydrolysis. Moreover, the role of calcination temperature (300–900 °C) on stability, morphology, texture, and catalytic performance of the formed Co<sub>3</sub>O<sub>4</sub> have been addressed too. Co<sub>3</sub>O<sub>4</sub> was found to be the major formed phase together with trace quantities of graphitic carbon over the 300–700 °C range. Pushing the calcination temperature to 900 °C was associated with a thermal reduction of Co<sub>3</sub>O<sub>4</sub> to CoO and the elimination of the graphitic carbon. The highest activity was obtained using the 700 °C calcined catalyst (4449 ml g<sup>− 1</sup> min<sup>− 1</sup> at 45 °C).</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Representation of the green synthesis strategy followed during the synthesis of Co<sub>3</sub>O<sub>4</sub> NPs and its application as a catalyst for the hydrogen generation via the hydrolysis of sodium borohydride</p></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832313","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

Designing of Permanganate Based Functionalized Organic-Inorganic Hybrid as Environmentally Benign Oxidative Catalyst for Controlled Oxidation of Benzyl Alcohol 高锰酸盐基功能化有机-无机杂化物控制苯甲醇氧化的环保催化剂设计

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-12 DOI: 10.1007/s10562-025-05137-y

Sangeeta Kalita, Mrityunjoy Dey, Nand Kishor Gour, Debanga Bhusan Bora, Ruli Borah

{"title":"Designing of Permanganate Based Functionalized Organic-Inorganic Hybrid as Environmentally Benign Oxidative Catalyst for Controlled Oxidation of Benzyl Alcohol","authors":"Sangeeta Kalita, Mrityunjoy Dey, Nand Kishor Gour, Debanga Bhusan Bora, Ruli Borah","doi":"10.1007/s10562-025-05137-y","DOIUrl":"10.1007/s10562-025-05137-y","url":null,"abstract":"<div><p>In this study, an organic-inorganic hybrid [MDSIM][MnO<sub>4</sub>] of 2-methyl-1,3-disulfoimidazolium [MDSIM]<sup>+</sup> cation with permanganate (MnO<sub>4</sub><sup>−</sup>) anion was prepared as solid material <i>via</i> metathesis reaction of 2-methyl-1,3-disulfoimidazolium chloride ([MDSIM]Cl) ionic liquid with potassium permanganate. Structural composition of this hybrid was established by FT-IR, UV-Vis DRS, Powder-XRD, Raman, Scanning Electron Microscopy, Energy Dispersive X-ray analysis and elemental mapping studies.Thermo-gravimetric analysis pointed out its extensive thermal stability, whereas SEM images indicated heterogeneous morphology of various sized crystalline granules. The material was explored as recyclable homogeneous oxidative catalyst for controlled oxidation of primary/secondary benzyl alcohols to carbonyl compounds in 10% aqueous H<sub>2</sub>SO<sub>4</sub> and acetonitrile solution at 80 °C and in solvent-aided grinding method at room temperature. The role of acid was identified as a co-catalyst in the oxidation reactions. Theoretical calculations using density functional theory (DFT), regarding the optimized structure of the hybrid and proposed mechanism of oxidation reaction, also provided support towards the efficacy of this recyclable material as a catalyst as well as oxidant.</p><h3>Graphical Abstract</h3><p>An organic-inorganic hybrid of 2-methyl-1,3-disulfoimidazolium cation with MnO<sub>4</sub><sup>−</sup> anion was developed as recyclable oxidative catalyst for selective conversion of benzyl alcohol to aldehydes in acidic conditions. Density functional theory was used to optimize the structure of hybrid and plausible mechanism of the oxidation reaction.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144832025","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

A Pd-Cu Nanosized Catalyst Supported on γ-Al2O3 for Liquid-Phase Nitrobenzene Hydrogenation γ-Al2O3负载的Pd-Cu纳米催化剂液相加氢研究

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-11 DOI: 10.1007/s10562-025-05136-z

Svetlana I. Pomogailo, Elena V. Shuvalova, Evgeniya I. Knerel’man, Olga P. Tkachenko, Evgenii G. Chepaikin, Daria A. Pomogailo, Leonid M. Kustov

{"title":"A Pd-Cu Nanosized Catalyst Supported on γ-Al2O3 for Liquid-Phase Nitrobenzene Hydrogenation","authors":"Svetlana I. Pomogailo, Elena V. Shuvalova, Evgeniya I. Knerel’man, Olga P. Tkachenko, Evgenii G. Chepaikin, Daria A. Pomogailo, Leonid M. Kustov","doi":"10.1007/s10562-025-05136-z","DOIUrl":"10.1007/s10562-025-05136-z","url":null,"abstract":"<div><p>Copper nanocatalysts doped with palladium deposited on γ-Al<sub>2</sub>O<sub>3</sub> were prepared and used for the hydrogenation of nitrobenzene. The catalysts were obtained by the formation of intermediate metal-complex compounds on the surface of the γ-Al<sub>2</sub>O<sub>3</sub> carrier with their subsequent hydrogenolysis and reduction of the active phases of the catalyst, calcination, and additional treatment with hydrogen. The structure of the catalysts was investigated using the following. low-temperature nitrogen sorption, SEM with EDX, TEM, X-ray fluorescence analysis, XRD, and DRIFTS. DRIFT studies indicate the presence of active phases of catalysts in the form of reduced and divalent palladium and copper. According to DRIFTS-CO data, copper is present in the Cu<sup>2+</sup> state in the calcined catalysts Cu/γ-Al<sub>2</sub>O<sub>3</sub>_1 and Cu-Pd/γ-Al<sub>2</sub>O<sub>3</sub>_1, but it is reduced to Cu<sup>+</sup> when the reducing agent, CO, is adsorbed. Palladium in the calcined sample of Cu-Pd/γ-Al<sub>2</sub>O<sub>3</sub>_1 is present in two states - Pd<sup>2+</sup> and Pd<sup>0</sup> (due to the method of preparation of this sample). In the Cu-Pd/γ-Al<sub>2</sub>O<sub>3</sub>_2 catalyst, the state of palladium is Pd<sup>+</sup>. It was found that the metal content on the surface of the particles increases after reduction in hydrogen. The catalyst based on Cu/γ-Al<sub>2</sub>O<sub>3</sub> had low activity, the addition of palladium led to an increase in the activity. Thus, in the presence of the PdCu/γ-Al<sub>2</sub>O<sub>3</sub> catalyst, a 85% nitrobenzene conversion was achieved with a 100% aniline selectivity.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><img></picture></div></div></figure></div></div>","PeriodicalId":508,"journal":{"name":"Catalysis Letters","volume":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144810893","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

Opportunities for Heterogeneous Photocatalysis: Quantum Efficiency Enhancement, Selectivity Control, and Scale Up 多相光催化的机会：量子效率增强，选择性控制和规模扩大

IF 2.3 4区化学

Catalysis Letters Pub Date : 2025-08-09 DOI: 10.1007/s10562-025-05129-y

Atsu Kludze, Lucas Bertucci, Saumya Gulati, Shu Hu

{"title":"Opportunities for Heterogeneous Photocatalysis: Quantum Efficiency Enhancement, Selectivity Control, and Scale Up","authors":"Atsu Kludze, Lucas Bertucci, Saumya Gulati, Shu Hu","doi":"10.1007/s10562-025-05129-y","DOIUrl":"10.1007/s10562-025-05129-y","url":null,"abstract":"<div><p>Photocatalysis, a light-driven chemical conversion process, is a promising alternative to energy-intensive, heat-driven catalytic systems. However, current photocatalytic systems have significantly lower chemical throughput than their heat-driven counterparts, which limits their commercial viability. While substantial progress has been made improving photocatalytic activity and efficiency, a reassessment of the existing photocatalyst design framework is essential for further advancement. This perspective aims to broaden the current framework by considering product selectivity, a critical performance metric in catalytic systems. We begin by analyzing photocatalytic water splitting, a challenging reaction that has guided current design strategies to emphasize tuning band-edge energetics and charge carrier dynamics, and explore its potential application as a model for other photocatalytic reactions. We then examine the role of photogenerated reactive intermediates, using the photocatalytic generation of reactive oxygen species to demonstrate how reactive intermediates can be tuned to enhance selectivity and enable new chemical pathways. Next, we examine the reaction mechanism of photocatalytic acceptorless alcohol dehydrogenation to demonstrate how photocatalyst surface interactions can be engineered to facilitate the reaction and enhance selectivity. Building upon these insights, we propose the strategic use of thin-film coatings to enhance stability and selectivity. Lastly, we briefly outline photoreactor design considerations that are crucial to develop scaled-up photoreactors or photocatalytic conversion devices. By discussing these strategies, this perspective aims to provide a framework to advance the development of photocatalytic systems, focusing on optimizing key processes that govern photocatalytic reactions.</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":"155 9","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163177","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