No abstract

Nanosheets of HZSM-5 zeolite with different SiO2/Al2O3 molar ratios were synthesized, and their catalytic behavior in the methanol-to-propylene (MTP) reaction was evaluated in a fixed bed reactor. The effect of reaction conditions on catalytic performance was studied in detail. The catalytic performance of nanosheets of HZSM-5 zeolites in the MTP reaction was compared with that of the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite had higher propylene selectivity, total three olefins′ selectivity (ethylene, propylene, C4 alkenes), and a longer catalytic lifetime than the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite with a SiO2/Al2O3 molar ratio of 213 yielded a propylene selectivity of 46.7%, total three olefins′ selectivity of 78.7% at 470°C, and a methanol weight hourly space velocity (WHSV) of 3 h -1 . It also yielded a propylene/ethylene mass ratio of 6.5, which was double that of the nanosized HZSM-5 zeolite. The nanosheets of HZSM-5 zeolite had a lower aromatic selectivity than the nanosized HZSM-5 zeolite. The good MTP catalytic performance of the nanosheets of HZSM-5 zeolite was attributed to their wide (010) surface, high external surface area, and large mesoporous volume.

No abstract