화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.11, No.5, 681-687, September, 2005
Partial Oxidation of Methane to Syngas Over Rh and Ni Catalysts Impregnated on CeO2, SiO2, and Al2O3
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The partial oxidation of methane (POM) to syngas was investigated over Rh(5) and Ni(5) catalysts impregnated on CeO2, SiO2, and Al2O3 in a fixed bed flow reactor under atmospheric conditions. The catalysts were analyzed by TEM, , EDS, XPS, BET, and XRD. The CeO2 carrier exhibited a slightly higher initial catalytic activity than did the SiO2 and Al2O3 carriers for both the Rh(5) and Ni(5) catalysts. The stability of the Rh(5)/CeO2 and Ni(5)/CeO2 catalysts remained constant for this first 30 hr. The TEM and EDS analyses showed that the nanoparticles of Rh and Ni, as well as ceria, were located on the catalyst surface prior to the reaction. XPS spectra of the O 1s core electron levels for the reduced Rh(5)/CeO2 and the Ni(5)/CeO2 catalyst showed Ce4+ and Ce3+ ions. The high syngas yields over both the Rh(5)/CeO2 and Ni(5)/CeO2 catalysts suggest that important roles are played by CeO2-X, caused by formation of the lattice oxygen, O2-, and the oxygen vacancy due to the redox reaction between Ce4+ and Ce3+.
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