As shown in Fig. , the carbon number distribution of the hydrocarbon products obtained by the reaction of ethylene with toluene was concentrated in C9-C11, especially of C9 aromatics. However, the carbon number distribution of the hydrocarbon products from the reaction of propylene and toluene was broader, with a large number of light alkanes in addition to the C8 + products. In addition, the selectivity of ethyltoluene in the oil phase obtained by the reaction of ethylene and toluene was as high as 52.8%, while the total selectivity of ethyltoluene and propyltoluene in the oil phase obtained by the reaction of propylene and toluene was only 31.6% (Fig. ). This indicated that the lower the carbon number of olefins, the higher the activity of alkylation with toluene.