Influence of Tin Loading and Pore Size of Sn/MCM-41 Catalysts on the Synthesis of Nopol
| Autor: | Edwin Alarcón, Aída-Luz Villa, Carlos A. Carrero, Juan M. Venegas, William P. McDermott, Daniel Casas-Orozco, Ellen Klosterman, Ive Hermans |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
010405 organic chemistry Silica gel General Chemical Engineering Inorganic chemistry chemistry.chemical_element General Chemistry 010402 general chemistry 01 natural sciences Industrial and Manufacturing Engineering 0104 chemical sciences Catalysis Metal chemistry.chemical_compound chemistry Octahedron MCM-41 visual_art Monolayer visual_art.visual_art_medium Tin Incipient wetness impregnation |
| Zdroj: | Industrial & Engineering Chemistry Research. 56:6590-6598 |
| ISSN: | 1520-5045 0888-5885 |
| DOI: | 10.1021/acs.iecr.7b00789 |
| Popis: | In this work, we investigate the influence of the Sn-loading and the pore size of MCM-41 materials on catalytic nopol production. Sn(IV) was anchored onto MCM-41 by incipient wetness impregnation with metal coverages within 0.01 and 0.5 Sn nm–2 (i.e., below the monolayer content). We provide evidence that at coverages below 0.06 Sn nm–2, Sn(IV) is predominantly present as isolated centers, whereas at higher coverages octahedral and/or oligomeric species are formed, which exhibit lower catalytic activity. The rate of nopol production over Sn/MCM-41 was ten times higher than that of analogous Sn silica gel materials. The turnover frequency features a maximum as a function of Sn coverage between 0.03 and 0.05 Sn nm–2 for Sn/MCM-41 catalysts and 0.15 Sn nm–2 for Sn silica gel materials. These results show that both the metal content and pore size can be tuned to enhance catalytic performance of Sn/MCM-41 materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|