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Preferential oligomerization of isobutene in mixtures of isobutene and 1-butene over 12-tungstosilicic acid supported on silica

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Abstract
Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene (molar ratio of 1:1) over
H4SiW12O40/SiO2 was investigated with different loadings of H4SiW12O40. The catalytic performance of
H4SiW12O40/SiO2 was compared with those of typical solid acids, such as H-b, SiO2-Al2O3, and SO4
2/
ZrO2. H4SiW12O40/SiO2 was superior in activity and selectivity for isobutene oligomerization (defined as
the fraction of isobutene converted against the total conversion) compared to other catalysts. The activity
was sensitive to the H4SiW12O40 loading on SiO2, reaching a maximum at around 40 wt.%, due to the
change in the acid amount of the outermost surface as determined by temperature-programmed
desorption of benzonitrile. The selectivity for isobutene oligomerization also changed with the
H4SiW12O40 loading. The highest selectivity (95%) was achieved using 10 wt.% H4SiW12O40/SiO2 at
293 K, due to the absence of strong acid sites on the outermost surface. In the conversion of linear butene
(1- and 2-butene), an induction period occurred when 10 wt.% H4SiW12O40/SiO2 was used, because linear
butene cannot adsorb on the acid sites when isobutene is present in the reaction mixture.

Keywords:Supported heteropolyacid, Isobutene, Linear butene, Oligomerization, Solid acid, Surface acidity

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Informasi Detail

Judul Seri

Applied Catalysis A: General

No. Panggil

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Penerbit

London : Elsevier B.V.., 2009

Deskripsi Fisik

Applied Catalysis A: General 353 (2009) 68–73

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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