Detection of Steady State Multiplicity during Dimethyl Ether Conversion Catalyzed by ZnO/γ-Al2O3 Composite: Effect of Coke and Hydrogen Peroxide
| Autor: | A. L. Maksimov, R. M. Talyshinskii, V. F. Tret’yakov |
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| Rok vydání: | 2020 |
| Předmět: |
010405 organic chemistry
Chemistry General Chemical Engineering Inorganic chemistry Energy Engineering and Power Technology General Chemistry Coke Atmospheric temperature range 010402 general chemistry 01 natural sciences 0104 chemical sciences Catalysis chemistry.chemical_compound Hysteresis Fuel Technology Geochemistry and Petrology Redistribution (chemistry) Dimethyl ether Lewis acids and bases Hydrogen peroxide |
| Zdroj: | Petroleum Chemistry. 60:773-784 |
| ISSN: | 1555-6239 0965-5441 |
| DOI: | 10.1134/s0965544120070087 |
| Popis: | The heterogeneous catalytic conversion of dimethyl ether (DME) to 1,3-butadiene and butylenes in the presence of a ZnO/γ-Al2O3 catalyst in a wide range of temperatures, feed space velocities, and reactant concentrations has been studied. It has been found that temperature regions of 380–420 and 440–480°C, which are conventionally designated as low-temperature and high-temperature regions, differ in the laws governing the occurrence of the process associated with the specificity of coking of the catalyst surface and a redistribution of the surface concentration of Bronsted and Lewis acid sites. A hypothesis of a change of the catalytic process mechanism upon the transition of the reaction into the high-temperature region has been put forward and confirmed by the occurrence of a hysteresis detected in this temperature range. The effect of hydrogen peroxide on the hysteresis parameters and the steady state stability during DME conversion has been shown. |
| Databáze: | OpenAIRE |
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