Promotion Effect of Cobalt-based Catalyst with Rare Earth for the Ethanol Steam Reforming

摘要

Catalytic performance of ethanol steam reforming (ESR) was investigated on praseodymium (Pr) modified ceriasupported cobalt oxide catalyst. The ceria-supported cobalt oxide (Ce-Co) catalyst was prepared by co-precipitation-oxidation (CPO) method, and the doped Pr (5 and 10 wt% loading) catalysts (Pr_5-Ce-Co and Pr_(10)-Ce-Co) were prepared by incipient wetness impregnation method. The reduction pretreatment under 250 and 400 C (H250 and H400) was also studied. All samples were characterized by XRD, TPR and TEM. Catalytic performance of ESR was tested from 250 to 500 C in a fixedbed reactor. The doping of Pr into the ceria lattice has significantly promoted the activity and reduced the coke formation. The products distribution also can be influenced by the different reduction pretreatment. The Pr_(10)-Ce-Co-H400 sample is a preferential ESR catalyst, where the hydrogen distribution approaches 73% at 475 C with less amounts (< 2%) of CO and CH_4.