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Effective silica supported Sb–V mixed oxide catalyst for selective oxidation of methanol to formaldehyde

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Abstract.
Silica supported Sb–V mixed oxide catalysts (VSbOx/SiO2) were prepared and evaluated in methanol
selective oxidation. One-pass yield of formaldehyde at 91% was obtained on one VSbOx/SiO2 catalyst. The
active phase of VSbOx/SiO2 catalysts is found to be Sb–V mixed oxide, in which isolated VOx species can
be stabilized. The relative amount of monomeric VOx species in VSbOx/SiO2 catalyst is higher than pure
supported VOx catalyst. On VSbOx/SiO2 catalyst, the deep oxidation of intermediates is greatly depressed
because the formation of adsorbed acyl species, which leads to COx, is not favored. The average oxidation
state of the vanadium in VSbOx/SiO2 catalysts increases with decreasing Sb/V ratio. Higher oxidation state
of the vanadium in VSbOx/SiO2 catalysts is found to be relevant to higher activity while V4+ species are
more selective to formaldehyde. Sb–V mixed oxide catalyst provides a possibility to adjust the production
distribution in methanol selective oxidation by changing Sb/V ratio.

Keywords:
Sb–V mixed oxide
Selective oxidation
Methanol
Formaldehyde

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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 260 (2008) 295–304

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

Versi lain/terkait

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