A study of the combined deactivation due to sulfur poisoning and carbon deposition during biogas dry reforming on supported Ni catalyst

Pawar, V and Appari, S and Monder, D and Janardhanan, V (2017) A study of the combined deactivation due to sulfur poisoning and carbon deposition during biogas dry reforming on supported Ni catalyst. Industrial and Engineering Chemistry Research, 56 (30). pp. 8448-8455. ISSN 0888-5885

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Abstract

This paper presents a detailed study of catalyst deactivation as a result of simultaneous sulfur poisoning and coke deposition during biogas dry reforming. Experiments are performed at 700 C and 800 C with 5 ppm and 10 ppm H2S in the model biogas with CH4/CO2=1.5 and 2.0. To assess the relative effect of chemisorbed sulfur in deactivating the supported Ni catalyst as compared to that of coke deposition, the experiments are performed with and without H2S in the feed. The catalyst deactivation is found to be faster in the presence of H2S. The deactivation due to sulfur chemisorption is not reversible at 700 C, while at 800 C the catalytic activity of Ni starts to recover on removing H2S from the feed stream. The sulfur poisoned catalyst is found to promote reverse water gas shift and coke gasification reactions leading to more CO formation. The fresh and the spent catalysts are characterized using XRD, BET, EDS and TEM. The characterization of the spent catalyst shows that dry reforming of model biogas, with and without the presence of H2S, leads the formation of multi-walled carbon nanotubes.

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