Journal
ACS CATALYSIS
Volume 3, Issue 8, Pages 1855-1864Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs400159w
Keywords
methane dry reforming; nickel catalyst; mesoporous support; SBA-16; ceria; XAFS
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Funding
- Cabinet Office, Government of Japan [GR090]
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Ni-ceria nanoparticles (Ni/Ce = 1/1) in the cage-like pores of SBA-16 were prepared and evaluated in methane dry reforming reactions. Coexistence of ceria in NiCe/SBA-16 resulted in forming uniformly sized Ni particles (ay. 5.7 nm) within the mesopores of SBA-16, because of the confinement effect from the framework of SBA-16 and the strong interaction between Ni and ceria. Ceria addition facilitated the reduction of NiCe/SBA-16 compared with Ni/SBA-16, and Ce3+ was the dominant species in both fresh and used NiCe/SBA-16 catalysts, as determined by Ce L-III-edge X-ray absorption near-edge structure (XANES). The methane conversion was much more stable on NiCe/SBA-16 than on Ni/CeO2 and Ni/SBA-16 in the methane dry reforming at 973 K during a 100 h reaction period; the deactivation of the Ni catalyst and the collapse of the SBA-16 framework were preferably suppressed for NiCe/SBA-16 under the reaction conditions. The remarkable effect of ceria on the structural stability of both the active Ni particles and the SBA-16 framework led to the consistent catalytic performance of NiCe/SBA-16 in methane dry reforming.
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