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- W1998449314 abstract "Abstract Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene (molar ratio of 1:1) over H 4 SiW 12 O 40 /SiO 2 was investigated with different loadings of H 4 SiW 12 O 40 . The catalytic performance of H 4 SiW 12 O 40 /SiO 2 was compared with those of typical solid acids, such as H-β, SiO 2 -Al 2 O 3 , and SO 4 2− /ZrO 2 . H 4 SiW 12 O 40 /SiO 2 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 H 4 SiW 12 O 40 loading on SiO 2 , 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 H 4 SiW 12 O 40 loading. The highest selectivity (∼95%) was achieved using 10 wt.% H 4 SiW 12 O 40 /SiO 2 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.% H 4 SiW 12 O 40 /SiO 2 was used, because linear butene cannot adsorb on the acid sites when isobutene is present in the reaction mixture." @default.
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- W1998449314 date "2009-01-01" @default.
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- W1998449314 title "Preferential oligomerization of isobutene in mixtures of isobutene and 1-butene over 12-tungstosilicic acid supported on silica" @default.
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- W1998449314 doi "https://doi.org/10.1016/j.apcata.2008.10.031" @default.
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