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

Muhamad, E. N., Irmawati, R., Tautiq-Yap, Y. H., Abdullah, A. H., Kniep, B., Girgsdies, F., et al. (2008). Comparative study of Cu/ZnO catalysts derived from different precursors as a function of aging. Catalysis Today, 131(1-4), 118-124. doi:10.1016/j.cattod.2007.10.010.

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 Creators:
Muhamad, Ernee Noryana, Author
Irmawati, R., Author
Tautiq-Yap, Y. H., Author
Abdullah, A. H., Author
Kniep, Benjamin1, Author              
Girgsdies, Frank1, Author              
Ressler, Thorsten1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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Free keywords: Precipitating agent; Aging; Copper; Zinc oxide; Microstrain 26, CuO/ZnO Catalysts in Methanol Steam Reforming
 Abstract: 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 (HC) 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 63Cu 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.

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Language(s): eng - English
 Dates: 2008-02-29
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 403338
DOI: 10.1016/j.cattod.2007.10.010
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Title: Catalysis Today
Source Genre: Journal
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Pages: - Volume / Issue: 131 (1-4) Sequence Number: - Start / End Page: 118 - 124 Identifier: ISSN: 0920-5861