Kinetic studies of CO 2 methanation over a Ni/ γ -Al 2 O 3 catalyst using a batch reactor
| Autor: | John S. Dennis, Andrew J. Sederman, Jin Yang Lim, James McGregor |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chemistry
Applied Mathematics General Chemical Engineering Batch reactor Inorganic chemistry Kinetics 02 engineering and technology General Chemistry Partial pressure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering Dissociation (chemistry) 0104 chemical sciences Catalysis Reaction rate Adsorption Methanation 0210 nano-technology |
| Zdroj: | Chemical Engineering Science. 141:28-45 |
| ISSN: | 0009-2509 |
| DOI: | 10.1016/j.ces.2015.10.026 |
| Popis: | The methanation of CO 2 was investigated over a wide range of partial pressures of products and reactants using a gradientless, spinning-basket reactor operated in batch mode. The rate and selectivity of CO 2 methanation, using a 12 wt% Ni/ γ –Al 2 O 3 catalyst , were explored at temperatures 453–483 K and pressures up to 20 bar. The rate was found to increase with increasing partial pressures of H 2 and CO 2 when the partial pressures of these reactants were low; however, the rate of reaction was found to be insensitive to changes in the partial pressures of H 2 and CO 2 when their partial pressures were high. A convenient method of determining the effect of H 2 O on the rate of reaction was also developed using the batch reactor and the inhibitory effect of H 2 O on CO 2 methanation was quantified. The kinetic measurements were compared with a mathematical model of the reactor, in which different kinetic expressions were explored. The kinetics of the reaction were found to be consistent with a mechanism in which adsorbed CO 2 dissociated to adsorbed CO and O on the surface of the catalyst with the rate-limiting step being the subsequent dissociation of adsorbed CO. |
| Databáze: | OpenAIRE |
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