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 isobute…