The effects of Na loading on catalytic properties of H2-reduced Pt/MoO3 for heptane isomerization

Na-loaded MoO3 was reduced with H2 in the presence of Pt, and its catalytic activity for heptane isomerization was studied. The isomerization activity decreased abruptly with increasing Na loading. The same tendency was observed in the dehydration of 2-propanol. In contrast, the catalytic activity for cyclohexene hydrogenation was improved by increasing amounts of Na. The physical properties of the H2-reduced catalysts, such as the surface area and the valence of Mo, were changed very little by the Na content. The isomerization and dehydration activities were related to the concentration of acid sites, which was determined from NH3-TPD. Thus, the isomerization reaction of heptane over H2-reduced Pt/MoO3 is concluded to occur due to the existence of acid sites.