In the study of proximity effect, we speculated that a moderate increase in proximity inhibited the cracking reaction by reducing the residence time of long-chain hydrocarbons on Z5. To prove this hypothesis, the residence time of long-chain hydrocarbons on Z5 was reduced by decreasing the amount of Z5. Reducing the amount of Z5 in the tandem catalyst led to a reduction in toluene conversion and C8 + selectivity, and an increase in low carbon hydrocarbon selectivity (especially for light olefins, Fig. ) due to the reduction in the amount of Z5 reducing the number of active sites for alkylation of olefins and toluene. At the same time, the selectivity of C10 in hydrocarbon products increased from 9.9% to 26.2%, while the selectivity of C9 decreased from 39.8% to 24.0% (Fig. ). Propyltoluene in the oil phase also increased significantly and ethyltoluene decreased significantly (Fig. ), which proved that shortening the residence time of long-chain hydrocarbons on Z5 could inhibit the cracking reaction.