LEWIS ACIDITY OF MESOPOROUS MOLECULAR SIEVESFOR ACYLATION REACTIONS

摘要

The effect of the concentration of Lewis acid sites on the activity and selectivity ofdifferent molecular sieve catalysts was investigated in the Friedel-Crafts acylation offerrocene with acetic anhydride, toluene with isobutyryl chloride, and cyclohexene and1-methylcyclohexene with propionic anhydride. H-, Zn-, Fe-, Al- and La-forms ofmesoporous molecular sieves (AI)MCM-41 and (AI)SBA-15 were studied and comparedwith large-pore zeolites. No general relationship between the type of cation andconversion of substrate was found. In acylation of ferrocene the highest ferroceneconversions were reached over Zn- and H-forms while in toluene acylation Al-formswere the most active. The selectivities over mesoporous molecular sieves were lower (61— 89 %) compared with zeolites (82 — 98 %).