Cyclohexene conversion and toluene methylation with dimethyl carbonate over Al-MCM-41 catalysts

摘要

Cyclohexene conversion and toluene alkylation were carried out over Al-MCM-41 catalysts previously characterised and described.Cyclohexene conversion reaction proceeds mainly according to two different processes: skeletal isomerisation (SI) and hydrogen transfer (HT).Results showed an increase in catalytic activity when increasing the temperature and data were well correlated with total acidity (pyridine titration data).On the other hand,alkylation reactions are widely applied in the industry.In this sense,acidic materials applied to this reaction,using dimethyl carbonate as alkylating agent,were found catalytically active.Results indicate that the first alkylation step leads to ortho-(preferred) and para-positions.Similar conversion values were found for samples and selectivity to xylenes was higher than 80 mol %.