Methanation of carbon dioxide over mesoporous Ni-Fe-Al2O3 catalysts prepared by a coprecipitation method: Effect of precipitation agent

摘要

Mesoporous nickel (30 wt%)-iron (5 wt%)-alumina (denoted as NiFeAl-X) catalysts were prepared by a coprecipitation method with a variation of precipitation agent (X = (NH4)2CO3, Na2CO3, NH4OH, and NaOH), and they were applied to the methane production from CO2 and H2. Metal particle size of reduced NiFeAl-X catalysts decreased in the order of NiFeAl-NaOH > NiFeAl-NH4OH > NiFeAl-Na2CO3 > NiFeAl-(NH4)2CO3. In the methanation of CO2. yield for GH4 increased in the order of NiFeAl-NaOH < NiFeAl-NH4OH < NiFeAl-Na2CO3 < NiFeAl-(NH4)2CO3. This indicates that the catalytic performance in the methanation of CO2 was strongly influenced by the identity of precipitation agent.