The influence of catalyst deactivation on product distribution in methanol to olefins over ZSM-5 catalysts
Volume Title: 1
1Saeed Sahebdelfar ; 1Fereydoon Yaripour; 1Solmaz Shifteh; 2Soheila Rajabi; 3Parisa Moghimpour Bijani
1Catalyst Research Group, Petrochemical Research and Technology Co., National Petrochemical Co.
2National Petrochemical Company, Petrochemical Research and Technology Company (NPC-RT)
3Catalyst Research Group, Petrochemical Research and Technology Company, National Petrochemical Company, Tehran, Iran.
The effect catalyst deactivation on product distribution in methanol to olefins reaction (MTO) over HZSM-5 catalyst was studied. The HZSM-5 and boron-modified HZSM-5 catalysts were prepared by hydrothermal method. Reaction tests were performed in a fixed-bed reactor until the end of catalyst lifetime. The Anderson-Schulz-Flory (ASF) distribution was used for the analysis of selectivity data. While the selectivity of lower olefins decreased with time-on-stream and that of C5+ hydrocarbon increased with time-on-stream, the ASF distribution was retained with a slight increase in chain probability growth. The C6+ product progressively became more olefinic as a result of reduced hydrogen transfer due to catalyst deactivtion.