Syngas production from methane dry reforming over Ni/SBA-15 catalyst: Effect of operating parameters. (20th April 2017)

• Record Type: Journal Article
• Authors: Omoregbe, Osaze; Danh, Huong T.; Nguyen-Huy, Chinh; Setiabudi, H.D.; Abidin, S.Z.; Truong, Quang Duc; Vo, Dai-Viet N.
• Is Part Of: International journal of hydrogen energy. Volume 42:Number 16(2017)
• Page Start: 11283
• Page End: 11294
• Publication Date: 2017-04-20
• Subjects: Methane dry reforming -- Syngas -- Hydrogen -- SBA-15 support -- Ni-based catalysts; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2017.03.146
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: 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 CH4 /CO2 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. H2 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 CH4 decomposition reaction. Both CH4 and CO2 conversions increased with rising reaction temperature and reaching about 91% and 94%, respectively at 1023 K with CO2 and CH4 partial pressure of 20 kPa. CH4 conversion improved with increasing CO2 partial pressure, P C O 2 and exhibited an optimum at P C O 2 of 30–50 kPa depending on reaction temperature whilst a substantial decline in CO2 conversion was observed with growing P C O 2 . Additionally, CH4 and CO2 conversions decreased significantly with rising CH4 partial pressure because of increasing carbon formation rate via CH4 cracking in CH4 -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. Graphical abstract: Highlights: Catalytic performance was unchanged with time-on-stream at 973–1023 K. The optimal CO2 partial pressure for CH4 conversion was observed at 30–50 kPa. 10%Ni/SBA-15 catalyst resisted to re-oxidation during methane dry reforming reaction. H2 /CO ratio close to unity suitable for Fischer–Tropsch synthesis.