Role of catalyst support over PdO-NiO catalysts on catalyst activity and stability for oxy-CO2 reforming of methane
Oemar, U. Hidajat, K. Kawi, S.
Oemar, U.
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Abstract
PdO-NiO catalysts over several commercial metal oxides were synthesized using incipient wet impregnation method. The activities of PdO-NiO catalysts for syngas production via oxy-CO2 reforming of methane were investigated at temperatures ranging from 500 °C to 800 °C in a fixed-bed continuous-flow reactor. The PdO-NiO/Y2O3 and PdO-NiO/Al2O3 catalysts show very high CH4 and CO2 conversions due to the formation of metal-support compound on these catalysts. On the PdO-NiO/Y2O3 catalyst, Pd interacts with Y2O3 support to form PdxO yYz compound while Ni interacts with Al2O 3 support to form NiAl2O4 spinel compound on the PdO-NiO/Al2O3 catalyst. However, the amount of deposited carbon on the spent PdO-NiO/Y2O3 catalyst is much lower than the one on the PdO-NiO/Al2O3 catalyst due to the presence of surface β-oxygen species and ability of Y 2O3 to form oxycarbonate species, resulting in stable catalytic performance without noticeable deactivation during reaction. The surface β-oxygen species are found to promote cracking of C-H bond in CH4 while the oxycarbonate species can oxidize the deposited carbon, respectively, hence leading to the stability of the PdO-NiO/Y2O 3 catalyst. © 2011 Elsevier B.V. All rights reserved.
Keywords
CO2 conversion, CO2 utilization, Formation of metal-support compound, Hydrogen production, Oxy-CO2 reforming of methane, PdO-NiO catalyst, Spinel catalyst, Syngas production, Y2O3
Source Title
Applied Catalysis A: General
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Date
2011-07-31
DOI
10.1016/j.apcata.2011.06.002
Type
Article