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Catalysis in Green Chemistry and Engineering

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ISSN Druckformat: 2572-9896

ISSN Online: 2572-990X

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REACTION KINETICS OF REVERSE WATER GAS SHIFT OVER ZnO/Al2O3 CATALYST

Volumen 4, Ausgabe 1, 2021, pp. 39-49
DOI: 10.1615/CatalGreenChemEng.2021037352
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ABSTRAKT

Methanol production from CO2 is a promising route for the chemical recycling of greenhouse gas. The carbon dioxide hydrogenation to form methanol via a reverse water gas shift reaction (CAMERE) process is an attractive option for CO2-to-methanol conversion. The first step−reverse water gas shift (RWGS)−is crucial for the success of the CAMERE process. ZnO/Al2O3 is a catalyst proven to be effective for the RWGS. In this work, reaction kinetics of a RWGS was investigated using a commercial ZnO/Al2O3 catalyst. Catalytic activity was tested in a fixed-bed flow reactor at 0.1 MPa in the 673-973 K range. The ratio of catalyst mass (W) to the feed rate of CO2 (F0CO2 ) was varied in the 1.4-9.7 g-h/mol range. The absence of mass transfer limitations was ascertained. The effects of reaction variables on the catalyst performance were studied, and it was found that the increase in pressure and the H2/CO2 ratio in the feed resulted in higher CO2 conversions. To study the reaction kinetics, differential reaction conditions were maintained (CO2 conversion < 10%). From the Arrhenius plot, activation energy was obtained (68 kJ/mol). Finally, the reaction pathway was analyzed using redox and associative reaction mechanisms, and it was found that the redox mechanism was prevalent for the reaction conditions employed in this work.

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