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Bromine-promoted PtZn is very effective for the chemoselective hydrogenation of crotonaldehyde

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Abstract.
The phase pure, unsupported intermetallic compound PtZn is intrinsically active and selective for
chemoselective hydrogenation of crotonaldehyde to crotyl alcohol in the absence of any support effects or
auxiliary phases. During un-promoted reaction conditions, the PtZn surface becomes platinum enriched
within the XPS sampling depth with respect to the 1:1 bulk stoichiometry. Catalyst modification by cofeeding
ppm levels of bromoethane results in (i) surface enrichment by zinc, (ii) pronounced formation of
a chemically distinct Znδ+ species and (iii) substantial improvements in selectivity toward crotyl alcohol
(up to 88% at 10% reactant conversion). Bromoethane promotion acts both by suppressing formation of
the undesired products and by enhancing crotyl alcohol formation, likely due to activation of the C=O
bond by coordination to the Znδ+ sites. Haloalkanes containing F, Cl or I do not induce any significant
effects in either surface composition or electronic structure, serving only to poison the system.

Keywords:
PtZn
Intermetallic compound
Heterogeneous catalysis
Chemoselective hydrogenation
Crotonaldehyde
Halogen
Promoter

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Catalysis 261 (2009) 60–65

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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