Syngas production from methane dry reforming over Ni/SBA-15 catalyst: Effect of operating parameters
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International Journal of Hydrogen Energy, ISSN: 0360-3199, Vol: 42, Issue: 16, Page: 11283-11294
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- Energy; Physics and Astronomy; Methane dry reforming; Syngas; Hydrogen; SBA-15 support; Ni-based catalysts
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The influence of operating conditions including reactant partial pressure and reaction temperature on the catalytic performance of 10%Ni/SBA-15 catalyst for methane dry reforming (MDR) reaction has been investigated in this study. MDR reaction was carried out under atmospheric pressure at varying CH 4 /CO 2 volume ratios of 3:1 to 1:3 and 923–1023 K in a tubular fixed-bed reactor. SBA-15 supported Ni catalyst exhibited high specific surface area of 444.96 m 2 g −1 and NiO phase with average crystallite size of 27 nm was detected on catalyst surface by X-ray diffraction and Raman measurements. H 2 temperature-programmed reaction shows that NiO particles were reduced to metallic Ni 0 phase with degree of reduction of about 90.1% and the reduction temperature depended on the extent of metal-support interaction and confinement effect of mesoporous silica support. Catalytic activity appeared to be stable for 4 h on-stream at 973–1023 K whilst a slight drop in activity was observed at 923 K probably due to deposited carbon formed by thermodynamically favored CH 4 decomposition reaction. Both CH 4 and CO 2 conversions increased with rising reaction temperature and reaching about 91% and 94%, respectively at 1023 K with CO 2 and CH 4 partial pressure of 20 kPa. CH 4 conversion improved with increasing CO 2 partial pressure, PCO2 and exhibited an optimum at PCO2 of 30–50 kPa depending on reaction temperature whilst a substantial decline in CO 2 conversion was observed with growing PCO2. Additionally, CH 4 and CO 2 conversions decreased significantly with rising CH 4 partial pressure because of increasing carbon formation rate via CH 4 cracking in CH 4 -rich feed. Post-reaction characterization shows that active Ni metal phase was not re-oxidized to inactive metal oxide during MDR reaction. The heterogeneous nature of deposited carbons including carbon nanofilament and graphite was detected on catalyst surface by Raman measurement.