Methane dehydroaromatization using Mo supported on sulfated zirconia catalyst: Effect of promoters
| Autor: | James J. Spivey, Srikar Bhattar, Swarom Kanitkar, Ashraful Abedin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Chemistry
Inorganic chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis Methane XANES 0104 chemical sciences chemistry.chemical_compound symbols.namesake symbols Cubic zirconia 0210 nano-technology Zeolite Brønsted–Lowry acid–base theory Selectivity Raman spectroscopy |
| Zdroj: | Catalysis Today. 365:71-79 |
| ISSN: | 0920-5861 |
| DOI: | 10.1016/j.cattod.2020.06.071 |
| Popis: | Methane dehydroaromatization (MDHA) is a direct approach of converting methane to aromatics and H2. Mo doped HZSM-5/HMCM-22 are considered as the most active and stable catalysts for MDHA. It is generally thought to involve a process in which Mo oxides convert to MoCy/MoOxCy active species that activate CH4 to C2Hy dimers. In a final step, C2Hy dimers undergo oligomerization on zeolite Bronsted acid sites. An alternative solid acid support is sulfated zirconia (SZ), which is known to contain strong Bronsted acidity. Carbon deposition is significant. Here, MDHA is compared to Pt, Pd, Cr, W promoters for Mo/SZ catalyst to decrease carbon deposition and increase aromatics selectivity. The catalysts are characterized using BET, SEM-EDS, DRIFTS, Raman Spectroscopy, XRD, XANES and TPO. Activity varied with different promoters. Less carbon deposition and slower deactivation were observed for Pd, Pt and Cr promoted catalysts, while W promotion resulted in more carbon deposition and rapid deactivation Compared to Pd and W promotion, Pt and Cr increased higher aromatics selectivity for Mo/SZ. |
| Databáze: | OpenAIRE |
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