Comparative study between Zn-Pd/C and Pd/ZnO catalysts for steam reforming of methanol

被引:75
作者
Suwa, Y [1 ]
Ito, SI [1 ]
Kameoka, S [1 ]
Tomishige, K [1 ]
Kunimori, K [1 ]
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.
引用
收藏
页码:9 / 16
页数:8
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