TY - JOUR
T1 - Support and alloy effects on activity and product selectivity for ethanol steam reforming over supported nickel cobalt catalysts
AU - Chen, Luwei
AU - Choong, Catherine Kai Shin
AU - Zhong, Ziyi
AU - Huang, Lin
AU - Wang, Zhan
AU - Lin, Jianyi
N1 - Funding Information:
This work was supported by the Science and Engineering Research Council of A*STAR (Agency for Science Technology and Research), Singapore.
PY - 2012/11
Y1 - 2012/11
N2 - Ni, Co and bimetallic Ni-Co catalysts supported on Ca-γ-Al 2O 3 and ZrO 2 were investigated for the production of hydrogen via ethanol steam reforming (ESR). Catalysts were prepared by wet impregnation method and characterized using temperature- programmed reduction (TPR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). ESR and temperature-programmed desorption of ethanol (ethanol-TPD) were carried out in a continuous flow fixed bed micro-reactor and the outlet gases were monitored by an on-line GC or MS. Ni is found to be more active for the C-C bond rupture than Co on both supports, Ca-γ-Al 2O 3 and ZrO 2. Catalyst support plays very important roles for the ESR. Strong interaction between support and metal affects the formation of NiCo bimetallic compound, resulting in the variety of catalytic activity. On Ca-γ-Al 2O 3 support, the catalytic activity of ESR follows the sequence of 10%Ni > 6.7%Ni 3.3%Co ∼ 3.3%Ni 6.7%Co > 10%Co. On ZrO 2, the trend is 10%Ni > 6.7%Ni 3.3%Co > 10%Co > 3.3%Ni 6.7%Co. The H 2O adsorption/activation ability of the support determines the reaction pathway and thus the product selectivity. On Ca-γ-Al 2O 3, water gas shift reaction is more favorable than on ZrO 2, due to the availability of surface OH groups. The roles of the metal and support for ESR are also discussed.
AB - Ni, Co and bimetallic Ni-Co catalysts supported on Ca-γ-Al 2O 3 and ZrO 2 were investigated for the production of hydrogen via ethanol steam reforming (ESR). Catalysts were prepared by wet impregnation method and characterized using temperature- programmed reduction (TPR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). ESR and temperature-programmed desorption of ethanol (ethanol-TPD) were carried out in a continuous flow fixed bed micro-reactor and the outlet gases were monitored by an on-line GC or MS. Ni is found to be more active for the C-C bond rupture than Co on both supports, Ca-γ-Al 2O 3 and ZrO 2. Catalyst support plays very important roles for the ESR. Strong interaction between support and metal affects the formation of NiCo bimetallic compound, resulting in the variety of catalytic activity. On Ca-γ-Al 2O 3 support, the catalytic activity of ESR follows the sequence of 10%Ni > 6.7%Ni 3.3%Co ∼ 3.3%Ni 6.7%Co > 10%Co. On ZrO 2, the trend is 10%Ni > 6.7%Ni 3.3%Co > 10%Co > 3.3%Ni 6.7%Co. The H 2O adsorption/activation ability of the support determines the reaction pathway and thus the product selectivity. On Ca-γ-Al 2O 3, water gas shift reaction is more favorable than on ZrO 2, due to the availability of surface OH groups. The roles of the metal and support for ESR are also discussed.
KW - Al O
KW - Bimetallic
KW - Hydrogen
KW - NiCo
KW - Steam reforming of ethanol
KW - ZrO
UR - http://www.scopus.com/inward/record.url?scp=84867401657&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2012.02.119
DO - 10.1016/j.ijhydene.2012.02.119
M3 - 文章
AN - SCOPUS:84867401657
SN - 0360-3199
VL - 37
SP - 16321
EP - 16332
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 21
ER -