Ethanol Steam Reforming on Co/CeO2: The Effect of ZnO Promoter

Journal Article · Mon Dec 02 04:00:00 EST 2013 · Topics in Catalysis, 56(18-20):1651-1659

DOI:https://doi.org/10.1007/s11244-013-0103-5· OSTI ID:1107479

Davidson, Stephen; Sun, Junming; Wang, Yong

A series of ZnO promoted Co/CeO2 catalysts were synthesized and characterized using XRD, TEM, H2-TPR, CO chemisorption, O2-TPO, IR-Py, and CO2-TPD. The effects of ZnO on the catalytic performances of Co/CeO2 were studied in ethanol steam reforming. It was found that the addition of ZnO facilitated the oxidation of Co0 via enhanced oxygen mobility of the CeO2 support which decreased the activity of Co/CeO2 in C–C bond cleavage of ethanol. 3 wt% ZnO promoted Co/CeO2 exhibited minimum CO and CH4 selectivity and maximum CO2 selectivity. This resulted from the combined effects of the following factors with increasing ZnO loading: (1) enhanced oxygen mobility of CeO2 facilitated the oxidation of CHx and CO to form CO2; (2) increased ZnO coverage on CeO2 surface reduced the interaction between CHx/CO and Co/CeO2; and (3) suppressed CO adsorption on Co0 reduced CO oxidation rate to form CO2. In addition, the addition of ZnO also modified the surface acidity and basicity of CeO2, which consequently affected the C2–C4 product distributions.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1107479
• Report Number(s): PNNL-SA-98436; KC0302010
• Journal Information: Topics in Catalysis, 56(18-20):1651-1659, Journal Name: Topics in Catalysis, 56(18-20):1651-1659
• Country of Publication: United States
• Language: English

Related Subjects

CeO2
Cobalt
Ethanol steam reforming
Hydrogen
ZnO promoter