title: A comparative study of catalytic partial oxidation of methane over CeO2 supported metallic catalysts.
abstract: In the present study, the catalytic partial oxidation of methane (CPOM) over various active metals supported on CeO2 (M/CeO2, M = Ir, Ni, Pd, Pt, Rh and Ru) has been investigated. The catalysts were characterized by X-ray diffraction (XRD), BET surface area, H2-temperature programmed reduction (H2-TPR), CO chemisorption and transmission electron microscope (TEM) analysis. Ir/CeO2 catalysts showed higher BET surface area, higher metal dispersion, small active metal nano-particles (approximately 3 nm) than compared to other M/CeO2 catalysts. The catalytic tests were carried out in a fixed R(mix) ratio of 2 (CH4/O2) in a fixed-bed reactor, operating isothermally at atmospheric pressure. From time-on-stream analysis at 700 degrees C for 12 h, a high and stable catalytic activity has been observed for Ir/CeO2 catalysts. TEM analysis of the spent catalysts showed that the decrease in the catalytic activity of Ni/CeO2 and Pd/CeO2 catalysts is due to carbon formation whereas no carbon formation has been observed for Ir/CeO2 catalysts.
authors: High-Temperature Energy Materials Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
authors: Kiyong
authors: K
authors: Ahn
authors: Yong-Chae
authors: YC
authors: Chung
authors: Jin Hee
authors: JH
authors: Oh
authors: D Hari
authors: DH
authors: Prasad
authors: Hyoungchul
authors: H
authors: Kim
authors: Hae-Ryoung
authors: HR
authors: Kim
authors: Ji-Won
authors: JW
authors: Son
authors: Hae-Weon
authors: HW
authors: Lee
authors: Jong-Ho
authors: JH
authors: Lee