Comparative study of Cu/ZnO catalysts derived from different precursors as a function of aging

被引：28

作者：

Muhamad, E. N. ^{[1
]}

Irmawati, R. ^{[1
]}

Tautiq-Yap, Y. H. ^{[1
]}

Abdullah, A. H. ^{[1
]}

Kniep, B. L. ^{[2
]}

Girgsdies, F. ^{[2
]}

Ressler, T. ^{[2
]}

机构：

[1] Univ Putra Malaysia, Fac Sci, Dept Chem, Serdang 43400, Selangor, Malaysia

[2] Fritz Haber Inst, Dept Inorgan Chem, D-14915 Berlin, Germany

来源：

CATALYSIS TODAY | 2008年 / 131卷 / 1-4期

关键词：

precipitating agent; aging; copper; zinc oxide; microstrain;

D O I：

10.1016/j.cattod.2007.10.010

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Structural modifications of Cu/ZnO catalysts for methanol steam reforming (MSR) as a function of precipitate aging in catalysts preparation process has been investigated comparatively. Freshly precipitated Cu,Zn-hydroxycarbonate (HQ and Cu,Zn-hydroxynitrate (HN) were aged in their mother liquor for a period of 120 min followed by washing, drying, calcination and reduction. Pronounced effect of aging was found for aged HC precipitates while no significant effect of aging was observed for aged HN solids. The bulk structure of the Cu/ZnO catalysts was investigated by means of TG/MS, in situ XRD and Cu-63 NMR. The increase in the activity of the catalysts prepared by HC aging did not correlate linearly with the specific Cu surface area but coincides with an increase in the microstrain in the copper clusters presumably because of the improved interface between Cu and ZnO. Meanwhile, aging of HN precipitates results in large, separated and less strained Cu and ZnO particles with an inferior catalytic activity. Finally, both aged Cu/ZnO catalysts revealed smaller copper crystallite size compared to unaged samples. (c) 2007 Published by Elsevier B.V.

引用

页码：118 / 124

页数：7

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