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Kinetics of CO₂ methanation over Ru/γ-Al₂O₃ and implications for renewable energy storage applications

Duyar, Melis S., Ramachandran, A., Wang, C. and Farrauto, R.J. (2015) Kinetics of CO₂ methanation over Ru/γ-Al₂O₃ and implications for renewable energy storage applications Journal of CO2 Utilization, 12. pp. 27-33.

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Abstract

Kinetics of CO₂ hydrogenation over a 10% Ru/γ-Al₂O₃ catalyst were investigated using thermogravimetric analysis and a differential reactor approach at atmospheric pressure and 230–245 °C. The data is consistent with an Eley–Rideal mechanism where H2 gas reacts with adsorbed CO₂ species. Activation energy, pre-exponential factor and reaction orders with respect to CO₂, H₂, CH₄, and H₂O were determined to develop an empirical rate equation. Methane was the only hydrocarbon product observed during CO₂ hydrogenation. The activation energy was found to be 66.1 kJ/g-mole CH₄. The reaction order for H₂ was 0.88 and for CO₂ 0.34. Product reaction orders were essentially zero. This work is part of a larger study related to capture and conversion of CO₂ to synthetic natural gas.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
NameEmailORCID
Duyar, Melis S.m.duyar@surrey.ac.uk
Ramachandran, A.
Wang, C.
Farrauto, R.J.
Date : December 2015
DOI : 10.1016/j.jcou.2015.10.003
Uncontrolled Keywords : CO2 hydrogenation; Eley-Rideal mechanism; Kinetics; Ru/γ-Al₂O3; Thermal analysis
Additional Information : No further action
Depositing User : Clive Harris
Date Deposited : 12 Jun 2019 13:07
Last Modified : 12 Jun 2019 13:11
URI: http://epubs.surrey.ac.uk/id/eprint/851979

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