Dehydroisomerization of butane into isobutene over platinum-loaded MFI-type ferrisilicate catalysts

The dehydroisomerization of butane to isobutene was studied over Pt-loaded MFI-type ferrisilicate catalysts with various Si/Fe ratios. The ratios of Si/Fe affected the yield of isobutene. The highest yield was realized with a ratio of 100, but higher ratios gave lower yields of isobutene caused by the decomposition of butane and butenes. The ratios of Si/Fe did not affect the conversion of butenes over the ferrisilicate catalysts, indicating that the platinum loaded on the ferrisilicate was responsible for the decomposition of butane and butenes. The particle size of platinum on ferrisilicate became smaller with lower ratios of Si/Fe.