A Comparative study of catalytic activity and lifetime of novel micro-meso porous catalysts in MTO process

TL;DR

This study compares the catalytic activity and longevity of two novel hierarchical mesoporous catalysts, SAPO-34 and SAPO-34/ZSM-5, in the MTO process, highlighting the superior lifetime and selectivity of hierarchical SAPO-34.

Contribution

It introduces and evaluates a bi-phase SAPO-34/ZSM-5 composite catalyst, demonstrating its enhanced stability and performance over traditional SAPO-34 in methanol-to-olefins reactions.

Findings

Hierarchical SAPO-34 exhibits longer catalyst lifetime.

SAPO-34/ZSM-5 composite shows reduced deactivation.

Full methanol conversion achieved in 200 minutes with hierarchical SAPO-34.

Abstract

Recently, two kinds of mesoporous catalysts with high propylene selectivity in propane dehydrogenation (PDH) process has been successfully synthesized. The first proposed catalyst is SAPO-34 molecular sieve with hierarchical tuned nanostructure. The second catalyst is a novel bi-phase SAPO-34/ZSM-5 zeolite hierarchical composite utilized with TPA-SAPO-34 exchanged core cystals being wrapped by ZSM-5 zeolite particles. In this contribution, the physico-chemical properties of the catalysts were analyzed by XRD, FESEM and N2 adsorption-desorption techniques and their catalytic activity and life time were investigated in MTO process. The results show that hierarchical SAPO-34 has a significant lifetime and selectivity to the light olefins compared with SAPO-34/ZSM-5. It shows a full conversion of MeOH during the first 200 min of reaction while composite sample conversion starts under 90 % and decreases during the time. However the deactivation phenomenon is hindered by using core-shell catalyst; hence the robustness can be named as a privilege employing composite zeolitic catalysts.