Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 311, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2020.110676
Keywords
SAPO-34; Hierarchical porous structure; MTO; Polyacrylamide
Categories
Funding
- NSFC-Henan Talent Development Joint Fund [U1204215]
- National Natural Science Foundation of China [21802125]
- Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering [2020-KF-23]
- China Scholarship Council
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In this study, hierarchical porous SAPO-34 zeolite with excellent catalytic properties was successfully prepared using a one-step hydrothermal synthesis method by introducing water-soluble polyacrylamide (PAM) hydrogel into the conventional SAPO-34 synthesis system. Compared to conventional microporous SAPO-34, the hierarchically structured SAPO-34 exhibited significantly longer catalytic lifetime (740 min) and improved selectivity for light olefins up to 87.5% in the MTO reaction.
Silicoaluminophosphate zeolite SAPO-34 with a CHA topological structure has been highlighted for its high methanol conversion and excellent selectivity for light olefins in the methanol-to-olefin (MTO) reaction. In this work, hierarchical porous SAPO-34 zeolite with excellent catalytic properties was first prepared by introducing water-soluble polyacrylamide (PAM) hydrogel into the synthesis system of conventional SAPO-34 by using a onestep hydrothermal synthesis method. The effects of PAM concentration and PAM type on the morphology and pore structure of hierarchical SAPO-34 catalysts and the formation mechanism of hierarchically structured zeolites were studied. Compared to conventional microporous SAPO-34, the hierarchically structured SAPO-34 exhibits excellent performance in the MTO reaction with an approximately three times longer catalytic lifetime (740 min) and remarkably improved selectivity for light olefins of up to 87.5%.
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