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Bi-reforming of methane on Ni/SBA-15 catalyst for syngas production: Influence of feed composition

Singh, Sharanjit and Mahadi, Bahari and Bawadi, Abdullah and Phuong, Pham T. T. and Truong, Quang Duc and Vo, Dai-Viet N. and Adesina, Adesoji A. (2018) Bi-reforming of methane on Ni/SBA-15 catalyst for syngas production: Influence of feed composition. International Journal of Hydrogen Energy, 43 (36). pp. 17230-17243. ISSN 0360-3199

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Abstract

Bi-reforming of methane (BRM) was evaluated for Ni catalyst dispersed on SBA-15 support prepared by hydrothermal technique. BRM reactions were conducted under atmospheric condition with varying reactant partial pressure in the range of 10–45 kPa and 1073 K in fixed-bed reactor. The ordered hexagonal mesoporous SBA-15 support possessing large specific surface area of 669.5 m2 g−1 was well preserved with NiO addition during incipient wetness impregnation. Additionally, NiO species with mean crystallite dimension of 14.5 nm were randomly distributed over SBA-15 support surface and inside its mesoporous channels. Thus, these particles were reduced at various temperatures depending on different degrees of metal-support interaction. At stoichiometric condition and 1073 K, CH4 and CO2 conversions were about 61.6% and 58.9%, respectively whilst H2/CO ratio of 2.14 slightly superior to theoretical value for BRM would suggest the predominance of methane steam reforming. H2 and CO yields were significantly enhanced with increasing CO2/(CH4 + H2O) ratio due to growing CO2 gasification rate of partially dehydrogenated species from CH4 decomposition. Additionally, a considerable decline of H2 to CO ratio from 2.14 to 1.83 was detected with reducing H2O/(CH4 + CO2) ratio due to dominant reverse water-gas shift side reaction at H2O-deficient feedstock. Interestingly, 10%Ni/SBA-15 catalyst was resistant to graphitic carbon formation in the co-occurrence of H2O and CO2 oxidizing agents and the mesoporous catalyst structure was still maintained after BRM. A strong correlation between formation of carbonaceous species and catalytic activity was observed.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Mesoporous silica; Methane bi-reforming; Ni/SBA-15; Syngas
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Dr. Vo Nguyen Dai Viet
Date Deposited: 21 Sep 2018 08:57
Last Modified: 21 Sep 2018 08:57
URI: http://umpir.ump.edu.my/id/eprint/22090
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