Abstract
Alkali-resistant Ni/SiO 2–Sil-1 and Ni/Al 2O 3–Sil-1 core–shell catalysts were prepared for use in direct internal reforming molten carbonate fuel cell (DIR-MCFC). A thin zeolite shell was grown on the surface of catalyst beads to create a diffusion barrier against alkali poisons in the vapors generated from the electrolyte during DIR-MCFC operation. The synthesis of low defect zeolite shell was investigated and the effects of shell thickness on catalyst activity were examined. A mathematical model of the reaction and alkali-poisoning was developed and the optimum zeolite shell thickness was determined. The experimental and modeling results demonstrated that the core–shell catalyst is more resistant to alkali poisoning and a zeolite shell thickness of 3.5 μm can protect the catalyst for at least 100 h following a failure of the anode barrier in DIR-MCFC to give sufficient time for repair.
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