Abstract
A homologous series of boron-containing MFI-type zeolites has been prepared and studied for catalytic activity. We find that boron is incorporated into the catalyst lattice and exhibits catalytic activity for one of the least demanding hydrogen conversions, double bond shift. It shows no activity for the next more demanding process, skeletal isomerization. We also find that boron enhances the formation of surface oligomers but lacks the acidity to crack these species. The result is that the presence of boron in an aluminum-containing MFI catalyst causes enhanced coke formation and an increased rate of catalyst decay. These results are confirmed by runs done on a silicalite synthesized from the same starting materials as those of the other catalysts. This sample showed no detectable catalytic activity.
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