Kim, JH Suh, DJ Park, TJ Kim, KL 2024-01-21T14:05:32Z 2024-01-21T14:05:32Z 2021-09-04 2000-05-01 0926-860X https://pubs.kist.re.kr/handle/201004/141392 CO2 reforming of CH4 was carried out over Ni-alumina aerogel catalysts prepared with various Ni loadings. The preparation of alumina supported Ni catalysts via sol-gel synthesis and subsequent supercritical drying led to the formation of very small metal particles, which are evenly distributed over the alumina support. The activity of the aerogel catalysts increased along with increasing metal loading, and eventually, the SAA25 (0.25 in Ni/Al mole ratio) catalyst exhibited the high activity comparable to that of a 5 wt.% Ru/alumina catalyst (ESCAT44, Engelhard). Compared to the alumina-supported Ni catalyst prepared by conventional impregnation method, Ni-alumina aerogel catalysts showed a remarkably low coking rate due to highly dispersed metal particles. From TEM micrograph studies, it was observed that the formation of filamentous carbon was significantly influenced by the metal particle size and proceeded mostly over the metal particles larger than 7 nm. The loss of catalytic activity at 973 K was mainly caused by coke deposition and sintering. (C) 2000 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV CARBON-DIOXIDE NICKEL-CATALYSTS SYNTHESIS GAS SUPPORTED RHODIUM METHANE DEACTIVATION OXIDATION SILICA Effect of metal particle size on coking during CO2 reforming of CH4 over Ni-alumina aerogel catalysts Article 10.1016/S0926-860X(99)00487-1 1 APPLIED CATALYSIS A-GENERAL, v.197, no.2, pp.191 - 200 APPLIED CATALYSIS A-GENERAL 197 2 191 200 scie scopus 000086526500003 2-s2.0-0002668407 Chemistry, Physical Environmental Sciences Chemistry Environmental Sciences & Ecology Article CARBON-DIOXIDE NICKEL-CATALYSTS SYNTHESIS GAS SUPPORTED RHODIUM METHANE DEACTIVATION OXIDATION SILICA methane carbon dioxide reforming sol-gel aerogel nickel alumina metal particle size deactivation filamentous carbon