화학공학소재연구정보센터
International Journal of Hydrogen Energy, Vol.40, No.30, 9201-9208, 2015
CO2 reforming of methane over Ni-Co/ZSM5 catalysts. Aging and carbon deposition study
The wet impregnation method was used to prepare ZSM5 supported nickel and/or cobalt monometallic and bimetallic catalysts with a 7 wt.% total metal loading. The CO2 reforming of methane reaction was carried out in the 600 degrees C-800 degrees C temperature range over the different catalysts (GHSV 60000 mL g(-1) hr(-1)). The cobalt containing catalysts favored the reverse water gas shift reaction at high temperature and cobalt acted as a synergist to nickel, as overall, bimetallic catalysts showed better catalytic performance. Carbon deposition was less expressed over catalysts with high cobalt content. Following 12 h on stream at 700 degrees C, the bimetallic catalyst with cobalt to nickel ratio of 2, showed high CO2 and CH4 conversions (similar to 60%) accompanied with the lowest carbon deposition (5%). The thermal analysis of aged catalysts showed that among the deposited carbon species, it is the carbon present in the proximity of nickel and/or cobalt catalytic sites that is responsible of deactivation. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.