Catalysts最新文献_第8页

Hydrothermally Synthesized MoS2 as Electrochemical Catalyst for the Fabrication of Thiabendazole Electrochemical Sensor and Dye Sensitized Solar Cells 水热合成的 MoS2 作为电化学催化剂用于制造噻苯咪唑电化学传感器和染料敏化太阳能电池

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-26 DOI: 10.3390/catal14020107

M. Khan, Khursheed Ahmad, Waseem Raza, R. A. Khan, Manas Sutradhar, Anup Paul

{"title":"Hydrothermally Synthesized MoS2 as Electrochemical Catalyst for the Fabrication of Thiabendazole Electrochemical Sensor and Dye Sensitized Solar Cells","authors":"M. Khan, Khursheed Ahmad, Waseem Raza, R. A. Khan, Manas Sutradhar, Anup Paul","doi":"10.3390/catal14020107","DOIUrl":"https://doi.org/10.3390/catal14020107","url":null,"abstract":"In this work we reported the hydrothermal preparation of molybdenum disulfide (MoS2). The phase purity and crystalline nature of the synthesized MoS2 were examined via the powder X-ray diffraction method. The surface morphological structure of the MoS2 was examined using scanning electron microscopy and transmission electron microscopy. The specific surface area of the MoS2 was calculated using the Brunauer-Emmett-Teller method. The elemental composition and distribution of the Mo and S elements were determined using energy-dispersive X-ray spectroscopy. The oxidation states of the Mo and S elements were studied through employing X-ray photoelectron spectroscopy. In further studies, we modified the active surface area (3 mm) of the glassy carbon (GC) electrode using MoS2 as an electrocatalyst. The MoS2 modified GC electrode (MSGC) was used as an electrochemical sensor for the detection of thiabendazole (TBZ). Linear sweep voltammetry (LSV) was used as the electrochemical sensing technique. The MSGC exhibited good performance in the detection of TBZ. A limit of detection of 0.1 µM with a sensitivity of 7.47 µA/µM.cm2 was obtained for the detection of TBZ using the LSV method. The MSGC also showed good selectivity for the detection of TBZ in the presence of various interfering compounds. The obtained results showed that MoS2 has good electrocatalytic properties. This motivated us to explore the catalytic properties of MoS2 in dye sensitized solar cells (DSSCs). Thus, we have fabricated DSSCs using MoS2 as a platinum-free counter electrode material. The MoS2 counter electrode-based DSSCs showed good power conversion efficiency of more than 5%. We believe that the present work is beneficial for the scientific community, and especially for research surrounding the design and fabrication of catalysts for electrochemical sensing and DSSC applications.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139594879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Basic Properties of ZnO, Ga2O3, and MgO—Quantitative IR Studies 氧化锌、氧化镓和氧化镁的基本特性--红外定量研究

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-26 DOI: 10.3390/catal14020106

J. Podobiński, Jerzy Datka

{"title":"Basic Properties of ZnO, Ga2O3, and MgO—Quantitative IR Studies","authors":"J. Podobiński, Jerzy Datka","doi":"10.3390/catal14020106","DOIUrl":"https://doi.org/10.3390/catal14020106","url":null,"abstract":"In our previous study, we elaborated a method of determination of concentrations of the basic sites O2− and OH− in a quantitative IR study of CO2 adsorption. Previous adsorption studies or TPD experiments only provided the total basicity without distinguishing between O2− and OH−. In this study, we determined the concentration of O2− and OH− on ZnO, Ga2O3, and MgO surfaces. The basicity of ZnO and MgO was found to be significantly higher than that of Ga2O3. The surface of ZnO was rich in O2−, the contribution of OH− was very small, and the Ga2O3 surface contained mainly OH−. For MgO, the contribution of O2− and OH− was comparable. According to the IR results, only a small fraction of all surface hydroxyls were sufficiently basic to react with CO2. The partial dehydroxylation changed the proportion of the concentrations of O2− and OH− on the oxides. We also elaborated upon a new method to determine the total concentration of basic sites via CO2 desorption monitored using IR. For all the oxides, we studied the sum of the concentrations of O2− and OH−, as determined in our quantitative IR studies, to find whether they were comparable with the total basicity determined in the desorption experiments.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139594934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Catalyst Coatings for Ammonia Decomposition in Microchannels at High Temperature and Elevated Pressure for Use in Decentralized and Mobile Hydrogen Generation 用于分散和移动式制氢的高温高压微通道氨分解催化剂涂层

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-26 DOI: 10.3390/catal14020104

Tobias Weissenberger, R. Zapf, H. Pennemann, G. Kolb

{"title":"Catalyst Coatings for Ammonia Decomposition in Microchannels at High Temperature and Elevated Pressure for Use in Decentralized and Mobile Hydrogen Generation","authors":"Tobias Weissenberger, R. Zapf, H. Pennemann, G. Kolb","doi":"10.3390/catal14020104","DOIUrl":"https://doi.org/10.3390/catal14020104","url":null,"abstract":"We report an investigation of catalyst performance for the decomposition of ammonia under industrially relevant conditions (high temperatures of up to 800 °C and an elevated pressure of 5 bar) with further emphasis on their stability at high reaction temperatures. The catalysts were applied and tested as coatings in 500 µm wide channels of microreactors. Nickel-based catalysts were studied and compared to a ruthenium-based catalyst supported on SiO2. The effect of the support on the catalytic performance was investigated, and CeO2-supported nickel catalysts were found to exhibit the highest activity. Promoters were applied to increase the NH3 decomposition activity of the Ni/CeO2 catalysts. The addition of cesium led to a slight reduction in activity, while lanthanum, calcium, and barium doping resulted in increased activity. In particular, the barium-doped Ni/CeO2 catalyst showed very high ammonia conversion and closed the activity gap with respect to ruthenium catalysts at reactor temperatures of 650 °C and higher. The hydrogen production rates achieved in this work were compared to values in the literature and were shown to exceed values found earlier for both nickel- and ruthenium-based catalysts. Furthermore, the ruthenium-based catalysts under investigation were rapidly deactivated at 700 °C, while the nickel-based catalysts did not show deactivation after 220 h on time on stream at 700 °C.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140494322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

The Effects of Buffer Nature on Immobilized Lipase Stability Depend on Enzyme Support Loading 缓冲液性质对固定化脂肪酶稳定性的影响取决于酶支持载荷

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-26 DOI: 10.3390/catal14020105

Pedro Abellanas-Perez, Diego Carballares, J. Rocha-Martín, Roberto Fernandez-Lafuente

{"title":"The Effects of Buffer Nature on Immobilized Lipase Stability Depend on Enzyme Support Loading","authors":"Pedro Abellanas-Perez, Diego Carballares, J. Rocha-Martín, Roberto Fernandez-Lafuente","doi":"10.3390/catal14020105","DOIUrl":"https://doi.org/10.3390/catal14020105","url":null,"abstract":"The lipases from Thermomyces lanuginosus (TLL) and Candida antarctica (B) (CALB) were immobilized on octyl-agarose beads at 1 mg/g (a loading under the capacity of the support) and by overloading the support with the enzymes. These biocatalysts were compared in their stabilities in 10 mM of sodium phosphate, HEPES, and Tris-HCl at pH 7. Lowly loaded CALB was more stable than highly loaded CALB preparation, while with TLL this effect was smaller. Phosphate was very negative for the stability of the CALB biocatalyst and moderately negative using TLL at both loadings. The stability of the enzymes in HEPES and Tris-HCl presented a different response as a function of the enzyme loading (e.g., using lowly loaded CALB, the stabilities were similar in both buffers, but it was clearly smaller in HEPES using the highly loaded biocatalysts). Moreover, the specific activity of the immobilized enzymes versus p-nitrophenol butyrate, triacetin and R- or S-methyl mandelate depended on the buffer, enzyme loading, and interaction between them. In some cases, almost twice the expected activity could be obtained using highly loaded octyl-CALB, depending on the buffer. A co-interaction between the effects on enzyme activity and the specificity of support enzyme loading and buffer nature was detected.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139594648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Gas-Phase Oxidative Dehydrogenation of n-Octane over Metal Oxide Catalysts: A Review 正辛烷在金属氧化物催化剂上的气相氧化脱氢反应：综述

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-25 DOI: 10.3390/catal14020100

Pinkie Ntola, Mzamo L. Shozi

引用次数: 0

The Effect of Precursor Concentration on the Crystallite Size of CeO2 to Enhance the Sulfur Resistance of Pt/CeO2 for Water Gas Shift 前驱体浓度对 CeO2 结晶粒度的影响以提高 Pt/CeO2 在水气变换中的抗硫性能

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-25 DOI: 10.3390/catal14020099

Gai Hong, K. Kim, Seon-Yong Ahn, B. Kim, Bong-Gyeong Shin, Min-Ju Oh, Y. Lee, Hyun-Seog Roh

{"title":"The Effect of Precursor Concentration on the Crystallite Size of CeO2 to Enhance the Sulfur Resistance of Pt/CeO2 for Water Gas Shift","authors":"Gai Hong, K. Kim, Seon-Yong Ahn, B. Kim, Bong-Gyeong Shin, Min-Ju Oh, Y. Lee, Hyun-Seog Roh","doi":"10.3390/catal14020099","DOIUrl":"https://doi.org/10.3390/catal14020099","url":null,"abstract":"To develop customized sulfur–resistant catalysts for the water gas shift (WGS) reaction in the waste–to–hydrogen process, the effects of changing the nucleation conditions of the CeO2 support on catalytic performance were investigated. Supersaturation is a critical kinetic parameter for nuclei formation. The degree of supersaturation of the CeO2 precipitation solution was controlled by varying the cerium precursor concentration from 0.02 to 0.20 M. Next, 2 wt.% of Pt was impregnated on those various CeO2 supports by the incipient wetness impregnation method. The prepared samples were then evaluated in a WGS reaction using waste–derived synthesis gas containing 500 ppm H2S. The Pt catalyst supported by CeO2 prepared at the highest precursor concentration of 0.20 M exhibited the best sulfur resistance and catalytic activity regeneration. The sulfur tolerance of the catalyst demonstrated a close correlation with its oxygen storage capacity and easier reducibility. The formation of oxygen vacancies in CeO2 supports is promoted by the formation of small crystals due to a high degree of supersaturation.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139598061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Innovative Catalytic Materials for Environmental Remediation and Energy Applications 用于环境修复和能源应用的创新催化材料

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-25 DOI: 10.3390/catal14020102

G. Bampos, A. Petala, Z. Frontistis

引用次数: 0

Unravelling the Influence of Binder Typology during the Additive Manufacturing of Hybrid Multi-Channel Cylinders for Catalytic Purposes 揭示用于催化的混合多通道圆筒增材制造过程中粘合剂类型的影响

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-25 DOI: 10.3390/catal14020101

S. Todaro, G. Bonura, Alessandro Cajumi, Mariarita Santoro, Fabrizio Randazzo, Giosuè Giacoppo, F. Frusteri, C. Cannilla

{"title":"Unravelling the Influence of Binder Typology during the Additive Manufacturing of Hybrid Multi-Channel Cylinders for Catalytic Purposes","authors":"S. Todaro, G. Bonura, Alessandro Cajumi, Mariarita Santoro, Fabrizio Randazzo, Giosuè Giacoppo, F. Frusteri, C. Cannilla","doi":"10.3390/catal14020101","DOIUrl":"https://doi.org/10.3390/catal14020101","url":null,"abstract":"In this work, a 3D printing methodology based on the robocasting of catalytic ink pastes was applied to obtain structured matrix-like cylinders as innovative materials for an effective utilization of carbon dioxide. The influence of three different binders (i.e., PEI, HPMC and MC) on the physio-chemical, mechanical and catalytic properties of multi-channel monoliths was studied against a reference binder-free powdered system in order to envisage the effectiveness of the printing procedure in realizing hybrid advanced materials at a higher control and reproducibility than from traditional preparation techniques. In terms of textural and structural properties, the micro-extruded 3D cylinders only evidenced a slight difference in terms of relative crystallinity, with minor effects on the surface area exposure in relation to the specific binder used during the direct ink writing process. More importantly, the typology of binder significantly affected the rheological properties of the catalytic ink, with the need of a controlled viscosity to ensure a suitable thixotropic behaviour of the extrudable pastes, finally determining an optimal mechanical resistance of the final 3D monolith. The experimental validation of the hybrid multi-channel cylinders under conditions of CO2 hydrogenation demonstrated the great potential of additive manufacturing in the realization of catalyst architectures characterized by unique features and fidelity scarcely reproducible via conventional synthetic techniques.","PeriodicalId":9794,"journal":{"name":"Catalysts","volume":null,"pages":null},"PeriodicalIF":3.9,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139598191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Acyclic Diene Metathesis (ADMET) Polymerization for the Synthesis of Chemically Recyclable Bio-Based Aliphatic Polyesters 用于合成可化学回收的生物基脂肪族聚酯的无环二烯元合成 (ADMET) 聚合反应

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-24 DOI: 10.3390/catal14020097

K. Nomura, Xiuxiu Wang

引用次数: 0

Mechanistic and Compositional Aspects of Industrial Catalysts for Selective CO2 Hydrogenation Processes 用于选择性二氧化碳加氢工艺的工业催化剂的机理和组成方面

IF 3.9 3区化学

Catalysts Pub Date : 2024-01-24 DOI: 10.3390/catal14020095

G. Busca, Elena Spennati, P. Riani, G. Garbarino

引用次数: 0