TY - JOUR
T1 - Steam reforming of ethanol over K promoted Co catalyst
AU - Ogo, Shuhei
AU - Shimizu, Takuya
AU - Nakazawa, Yusaku
AU - Mukawa, Kei
AU - Mukai, Daiki
AU - Sekine, Yasushi
N1 - Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/4/5
Y1 - 2015/4/5
N2 - We investigated the catalytic activity of Co/K/α-Al2O3 with various potassium (K) loadings for ethanol steam reforming. The promotion effect of K loading and the role of K in Co/K/α-Al2O3 were investigated using TEM-EDX, H2-TPR, XAFS, XPS, and IR measurements. Results show that loading of 1-2 wt% K on Co/α-Al2O3 was effective for improving catalytic activity, selectivity to hydrogen and suppressing by-product (CH4, C2H4, and coke) formations. Measurements by H2-TPR and XAFS showed that the reducibility of the supported Co species decreased by K loading. TEM measurements revealed that the Co0-CoO core-shell structure was formed over Co/K/α-Al2O3 during ethanol steam reforming at 823 K, suggesting that the oxidized Co species (CoO) is a highly active species in ethanol steam reforming. In situ IR measurements revealed that the adsorbed ethanol forms stable acetate species by K loading, which improves hydrogen selectivity.
AB - We investigated the catalytic activity of Co/K/α-Al2O3 with various potassium (K) loadings for ethanol steam reforming. The promotion effect of K loading and the role of K in Co/K/α-Al2O3 were investigated using TEM-EDX, H2-TPR, XAFS, XPS, and IR measurements. Results show that loading of 1-2 wt% K on Co/α-Al2O3 was effective for improving catalytic activity, selectivity to hydrogen and suppressing by-product (CH4, C2H4, and coke) formations. Measurements by H2-TPR and XAFS showed that the reducibility of the supported Co species decreased by K loading. TEM measurements revealed that the Co0-CoO core-shell structure was formed over Co/K/α-Al2O3 during ethanol steam reforming at 823 K, suggesting that the oxidized Co species (CoO) is a highly active species in ethanol steam reforming. In situ IR measurements revealed that the adsorbed ethanol forms stable acetate species by K loading, which improves hydrogen selectivity.
KW - Core-shell structure
KW - Ethanol steam reforming
KW - Hydrogen production
KW - In situ IR
KW - K loading
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U2 - 10.1016/j.apcata.2015.01.018
DO - 10.1016/j.apcata.2015.01.018
M3 - Article
AN - SCOPUS:84923571300
SN - 0926-860X
VL - 495
SP - 30
EP - 38
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
ER -
