Studying activity, product distribution and lifetime of Sr promoted alkali modified low Si ZSM-5 catalyst in MTO process

• Alkali-modified synthesized H-ZSM-5 was improved, then tested in diffusion properties.
• Methanol dehydration to produce light olefins and gasoline-range-aromatics was performed.
• Effects of Impregnation on lifetime and product distribution was studied.
• Ultrasound technology was employed for development of wet impregnation method.
• All products were analyzed and optimum operating conditions were discussed.

This article mainly concerns the performance and behavior and investigation of changes in activity and selectivity of Low Si/Al of ZSM-5 to find the best production distribution. The non-promoted catalyst to be compared with the promoted one was a Si/Al = 31.5 H-ZSM-5, tested previously. Wet Impregnation was made using Ultrasonic system combined by special pH control. The results showed how acid sites changed by the TOS and also how products distribution improved in both phases. Also, the results showed how Strontium decreased Gas and increased liquid production. This leads to achieve MTA (Methanol to Aromatics) or MTHC (Methanol to Hydrocarbons) catalyst.