Experimental study demonstrates enhanced stability and coke resistance of gadolinium-promoted ruthenium nanorods in dry methane reforming, suggesting a viable route for greenhouse gas conversion.
Dry reforming of methane is considered a potential reaction for the utilization of waste greenhouse gases to generate valuable chemicals. However, catalyst deactivation under a harsh reaction condition appears as the main obstacle toward its commercialization. In the present work, a facile hydrothermal synthesis procedure was adopted to prepare a robust Ru-based catalyst. Among the various combinations, a 1% Ru supported over Zr 0.5 Ce 0.5 O 2 nanorod catalyst showed enhanced coke resistance and almost stable activity during 200 h activity analysis. Promotion of Ru/Zr 0.5 Ce 0.5 O 2 with an optimum amount of Gd 2 O 3 improved catalyst stability, which was attributed to the strong interaction of Ru with Gd 2 O 3 leading to smaller Ru particle size (∼5 nm) and an improved OSC was inhibiting coke deposition. Promotion with 0.5% Gd 2 O 3 further lowered the apparent activation energy of methane conversion to ∼20.6 kcal/mol without changing the reaction orders significantly. DFT calculation confirmed, due to the orbital similarity, methane cracking is preferred over Ru atoms and CO 2 activation occurred on Gd atoms.
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Das et al. (2021) studied this question.
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