Methanol-to-olefins over FeHZSM-5: Further transformation of products

Abstract

The catalytic activity of FeHZSM-5 was investigated for the conversion of both methanol and mixed C3°+C4 hydrocarbons. For methanol conversion at WHSV=1h−1 and 470°C, 0.35% FeHZSM-5 showed increased selectivity for propylene and C2=–C4= olefins by 21% and 4%, respectively, compared with HZSM-5. The selectivity of propane and butylene decreased. High temperature favored the conversion of C3°+C4 mixture while the selectivity of ethene+propylene achieved a maximum at 470°C. Improved olefins selectivity for methanol conversion was attributed to FeHZSM-5 with more weak acid but less strong acid amount and to further transformation of the products.