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Enhancing the catalytic performance of Pt/ZnO in the selective hydrogenation of cinnamaldehyde by Cr addition to the support

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Abstract.
An enhancement of the catalytic performance of platinum in the liquid phase hydrogenation of
cinnamaldehyde has been achieved by modifying a ZnO support by addition of Cr(III) cations. The
addition of chromium improves the structural properties of the support (larger surface area) and
increases its reducibility, and resulted in a better Pt dispersion. The presence of chromium in the
support enhanced the overall catalytic activity, and improved the high selectivity towards the unsaturated
alcohol. The increase of the reduction temperature from 473 K to 623 K produces an impressive decrease
in the turnover frequency for Pt/ZnO, whereas this value remains practically unmodified for Pt/Cr–Zn.
The higher reduction temperature reduces the overall activity in both catalysts, but improves selectivity
towards the unsaturated alcohol. The present 5 wt% Pt/Cr–ZnO catalyst showed the best results (in terms
of selectivity) published until now without use of reaction promoters. The improved performance of this
catalyst is ascribed to an adequate metal–support interaction and to the higher reducibility of the support
that opens the possibility of alloy formation.

Keywords:
Cinnamaldehyde hydrogenation
Pt
Cr–ZnO
SMSI

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 258 (2008) 52–60

Bahasa

English

ISBN/ISSN

00219517

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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