Shape selective oxidation by a microporous platinum-polyoxometalate

Shape selective oxidation by a microporous platinum-polyoxometalate Shape selective catalytic behaviour of a platinum-promoted polyoxometalate, 0.5 wt% Pt−Cs2.1H0 9PW12O40, has been studied for complete oxidation of methane and benzene. The pore size of this catalyst determined by adsorptions of n-butane and isobutane was close to the molecular size of n-butane (0.43 nm). Ar and N2 porosimetries demonstrated that 0.5 wt% Pt−Cs2 1H0 9PW12O40 possesses unimodal distribution of pores in ultramicropore region. External surface area was estimated to be less than 3% that of the total surface area (61 m2 g−1) of the catalyst. Owing to the restricted pores, this exhibited efficient shape selectivity; methane (molecular size; 0.38 nm) was readily oxidized, while the oxidations of the larger molecule such as benzene (0.59 nm) were greatly suppressed. These results indicate that 0.5 wt% Pt−Cs2 1H0 9PW12O40 is a promising microporous catalyst. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Shape selective oxidation by a microporous platinum-polyoxometalate

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Publisher
Springer Netherlands
Copyright
Copyright © 2000 by Springer
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/156856700X00093
Publisher site
See Article on Publisher Site

Abstract

Shape selective catalytic behaviour of a platinum-promoted polyoxometalate, 0.5 wt% Pt−Cs2.1H0 9PW12O40, has been studied for complete oxidation of methane and benzene. The pore size of this catalyst determined by adsorptions of n-butane and isobutane was close to the molecular size of n-butane (0.43 nm). Ar and N2 porosimetries demonstrated that 0.5 wt% Pt−Cs2 1H0 9PW12O40 possesses unimodal distribution of pores in ultramicropore region. External surface area was estimated to be less than 3% that of the total surface area (61 m2 g−1) of the catalyst. Owing to the restricted pores, this exhibited efficient shape selectivity; methane (molecular size; 0.38 nm) was readily oxidized, while the oxidations of the larger molecule such as benzene (0.59 nm) were greatly suppressed. These results indicate that 0.5 wt% Pt−Cs2 1H0 9PW12O40 is a promising microporous catalyst.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 7, 2009

References

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