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Nurwita A, Trejda M. The Effect of Mesoporous Structure of the Support on the Oxidation of Dibenzothiophene. Int J Mol Sci 2023; 24:16957. [PMID: 38069280 PMCID: PMC10707218 DOI: 10.3390/ijms242316957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2023] [Revised: 11/14/2023] [Accepted: 11/28/2023] [Indexed: 12/18/2023] Open
Abstract
A source of Brønsted acid centers, generated on the surface of two mesoporous silica supports of different structures (SBA-15 and MCF), was 3-(trihydroxysilyl)-1-propanesufonic acid (TPS). The materials obtained were characterized and applied as catalysts for the oxidative desulfurization of dibenzothiophene (DBT) with hydrogen peroxide as a model ODS (oxidative desulfurization) process. The properties of the materials were examined via nitrogen physisorption, XRD (X-ray Diffraction) and elemental analysis showing the preservation of the support structure after modification with organosilane species. Due to the aggregation of catalyst particles in the reaction mixture, the SBA-15 based catalyst was not very effective in DBT oxidation. Contrary, TPS/MCF catalyst exhibited a very good activity (almost total conversion of DBT after 1 h in optimized reaction conditions) and stability in dibenzothiophene oxidation in mild reaction conditions.
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Affiliation(s)
| | - Maciej Trejda
- Faculty of Chemistry, Adam Mickiewicz University in Poznan, Uniwersytetu Poznanskiego 8, 61-614 Poznan, Poland;
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Pt supported micro-mesoporous catalysts: synthesis, characterization and catalytic evaluation in n-heptane isomerization. REACTION KINETICS MECHANISMS AND CATALYSIS 2022. [DOI: 10.1007/s11144-022-02305-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Insight into the selective oxidation of isobutene to methacrolein over Ce-accelerated Mo-Bi-Fe-Co-K-O catalyst. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Xu XF, Wang YF, Guo T, Luan LK, Liu SS, Xu BH. Synthesis of adiponitrile from dimethyl adipate and ammonia in the vapor-phase over niobium oxide. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00734g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An environmentally benign route leading to adiponitrile (ADN), a nylon-6,6 intermediate, was achieved by direct vapor-phase nitrilation of dimethyl adipate (DMA) with ammonia (NH3) in a fixed-bed reactor.
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Affiliation(s)
- Xiao-Feng Xu
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
| | - Yao-Feng Wang
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Tao Guo
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
- Tianjin University of Science and Technology, 300222, Tianjin, China
| | - Li-Kun Luan
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China
| | - Shan-Shan Liu
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
- Zhengzhou University, 450001, Zhengzhou, China
| | - Bao-Hua Xu
- Beijing Key Laboratory of Ionic Liquids Clean Processes, Institute of Process Engineering, Innovation Academy for Green Manufacture, Chinese Academy of Sciences, 100190, Beijing, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China
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Insight into Active Centers and Anti-Coke Behavior of Niobium-Containing SBA-15 for Glycerol Dehydration. Catalysts 2021. [DOI: 10.3390/catal11040488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Niobium containing SBA-15 was prepared by two methods: impregnation with different amounts of ammonium niobate(V) oxalate (Nb-15/SBA-15 and Nb-25/SBA-15 containing 15 wt.% and 25 wt.% of Nb, respectively) and mixing of mesoporous silica with Nb2O5 followed by heating at 500 °C (Nb2O5/SBA-15). The use of these two procedures allowed obtaining materials with different textural/surface properties determined by N2 adsorption/desorption isotherms, XRD, UV-Vis, pyridine, and NO adsorption combined with FTIR spectroscopy. Nb2O5/SBA-15 contained exclusively crystalline Nb2O5 on the SBA-15 surface, whereas the materials prepared by impregnation had both metal oxide and niobium incorporated into the silica matrix. The niobium species localized in silica framework generated Brønsted (BAS) and Lewis (LAS) acid sites. The inclusion of niobium into SBA-15 skeleton was crucial for the achievement of high catalytic performance. The strongest BAS were on Nb-25/SBA-15, whereas the highest concentration of BAS and LAS was on Nb-15/SBA-15 surface. Nb2O5/SBA-15 material possessed only weak LAS and BAS. The presence of the strongest BAS (Nb-25/SBA-15) resulted in the highest dehydration activity, whereas a high concentration of BAS was unfavorable. Silylation of niobium catalysts prepared by impregnation reduced the number of acidic sites and significantly increased acrolein yield and selectivity (from ca. 43% selectivity for Nb-25/SBA-15 to ca. 61% for silylated sample). This was accompanied by a considerable decrease in coke formation (from 47% selectivity for Nb-25/SBA-15 to 27% for silylated material).
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