HYDROGENATION OF CARBON MONOXIDE ON CO REDUCING CATALYST AND SOLID ACID (III). THE EFFECT OF THE PORE SIZE AND ACID PROPERTIES OF ZEOLITE ON THE PRODUCT DISTRIBUTION.

Abstract

Synthesis gas reactions over hybrid catalysts composed of Pd/SiO//2 and zeolites and methanol conversion on the same zeolites were studied. The selectivities to aromatic hydrocarbons were about 30% for the methanol conversions over ZSM-5, de-aluminated mordenite, and de-aluminated Y type zeolite (DAY), which possess strong acid sites. When ZSM-5 or mordenites were combined with Pd/SiO//2 and subjected to synthesis gas conversion, the selectivities to aromatic hydrocarbons were between 10% and 30%. However, the synthesis gas reaction over the hybrid catalyst composed of Pd/SiO//2 and DAY, gave few aromatic hydrocarbons, but aliphatic paraffins with 2 to 6 carbon atoms.