The isomerization reactions of n-butenes were studied over molybdena-alumina previously reduced with hydrogen at 823 K, without removal of the hydrogen adsorbed during reduction. The rate of isomerization and hydrogen scrambling increased, but the rate of metathesis decreased significantly due to the effect of preadsorbed hydrogen. This is explained by formation of sites on which transformation of Mo-butyl species (direct intermediates for isomerization) to Mo-butylidene species (initiators for the chain reaction of metathesis) are hindered.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry