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Microstructural characterization of Cu/ZnO/Al2O3 catalysts for methanol steam reforming—A comparative study

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Abstract.
Microstructural characteristics of various real Cu/ZnO/Al2O3 catalysts for methanol steam reforming
(MSR) were investigated by in situ X-ray diffraction (XRD), in situ X-ray absorption spectroscopy (XAS),
temperature programmed reduction (TPR) and electron microscopy (TEM). Structure–activity correlations
of binary Cu/ZnO model catalysts were compared to microstructural properties of the ternary
catalysts obtained from in situ experiments under MSR conditions. Similar to the binary system, in
addition to a high specific copper surface area the catalytic activity of Cu/ZnO/Al2O3 catalysts is
determined by defects in the bulk structure. The presence of lattice strain in the copper particles as the
result of an advanced Cu–ZnO interface was detected only for the most active Cu/ZnO/Al2O3 catalyst in
this study. Complementarily, a highly defect rich nature of both Cu and ZnO has been found in the shortrange
order structure (XAS). Conventional TPR and TEM investigations confirm a homogeneous
microstructure of Cu and ZnO particles with a narrow particle size distribution. Conversely, a
heterogeneous microstructure with large copper particles and a pronounced bimodal particle size
distribution was identified for the less active catalysts. Apparently, lattice strain in the copper
nanoparticles is an indicator for a homogeneous microstructure of superior Cu/ZnO/Al2O3 catalyst for
methanol chemistry.

Keywords:
Methanol steam reforming
Cu/ZnO/Al2O3 catalyst
Hydrogen production
Homogeneous microstructure
Cu lattice strain
TPR
TEM
XRD
XAS
In situ

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2008

Deskripsi Fisik

Applied Catalysis A: General 348 (2008) 153–164

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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