共 24 条
Comparative study between Zn-Pd/C and Pd/ZnO catalysts for steam reforming of methanol
被引:75
作者:

Suwa, Y
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Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

Ito, SI
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Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

Kameoka, S
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Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

Tomishige, K
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Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

Kunimori, K
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Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
机构:
[1] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan
关键词:
steam reforming;
methanol;
Pd-Zn alloy;
carbon black;
life test;
D O I:
10.1016/j.apcata.2004.02.016
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
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 H-2 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 Zn4CO3(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. (C) 2004 Elsevier B.V. All rights reserved.
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页码:9 / 16
页数:8
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