TY - JOUR
T1 - Comparative study between Zn-Pd/C and Pd/ZnO catalysts for steam reforming of methanol
AU - Suwa, Yoshinori
AU - Ito, Shin Ichi
AU - Kameoka, Satoshi
AU - Tomishige, Keiichi
AU - Kunimori, Kimio
PY - 2004/7/30
Y1 - 2004/7/30
N2 - Catalytic activity and CO2 selectivity over carbon black-supported Pd with the addition of Zn (Zn-Pd/C) was comparable to those of Pd/ZnO in methanol steam reforming. From the characterization of fresh Zn-Pd/C after H2 reduction pretreatment by means of BET surface area, XRD, TEM and the measurement of CO adsorption, Pd-Zn alloy particles were detected on Zn-Pd/C. This is also supported by high CO2 selectivity in methanol steam reforming over Zn-Pd/C as well as Pd/ZnO. In addition, Zn-Pd/C exhibited higher stability than Pd/ZnO in methanol steam reforming. After the reaction for the life test, the formation of zinc carbonate hydroxide such as Zn 4CO3(OH)6·H2O was clearly observed on Pd/ZnO. It is expected that the deactivation is caused by covering active Pd-Zn alloy particles with zinc carbonate hydroxide. Although this phenomenon can also occur on Zn-Pd/C, the deactivation rate was much lower than Pd/ZnO because the amount of free ZnO is much smaller on Zn-Pd/C.
AB - Catalytic activity and CO2 selectivity over carbon black-supported Pd with the addition of Zn (Zn-Pd/C) was comparable to those of Pd/ZnO in methanol steam reforming. From the characterization of fresh Zn-Pd/C after H2 reduction pretreatment by means of BET surface area, XRD, TEM and the measurement of CO adsorption, Pd-Zn alloy particles were detected on Zn-Pd/C. This is also supported by high CO2 selectivity in methanol steam reforming over Zn-Pd/C as well as Pd/ZnO. In addition, Zn-Pd/C exhibited higher stability than Pd/ZnO in methanol steam reforming. After the reaction for the life test, the formation of zinc carbonate hydroxide such as Zn 4CO3(OH)6·H2O was clearly observed on Pd/ZnO. It is expected that the deactivation is caused by covering active Pd-Zn alloy particles with zinc carbonate hydroxide. Although this phenomenon can also occur on Zn-Pd/C, the deactivation rate was much lower than Pd/ZnO because the amount of free ZnO is much smaller on Zn-Pd/C.
KW - Carbon black
KW - Life test
KW - Methanol
KW - Pd-Zn alloy
KW - Steam reforming
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U2 - 10.1016/j.apcata.2004.02.016
DO - 10.1016/j.apcata.2004.02.016
M3 - Article
AN - SCOPUS:2542442741
SN - 0926-860X
VL - 267
SP - 9
EP - 16
JO - Applied Catalysis A: General
JF - Applied Catalysis A: General
IS - 1-2
ER -