Synthesis of high hydrothermal stability Beta zeolite with crosslinked starch and catalytic performance in catalytic cracking reaction

Zeolite Beta was directly synthesized by the hydrothermal method with crosslinked starch successfully. When the crosslinked starch was added, the zeolite Beta displayed a larger particle size, fewer external silanol groups, higher ratio of FAI/EFAI (tetrahedral-coordinated framework aluminum/octrahedral-coordinated non-framework aluminum), and higher B/L acid ratio (the ratio of Bronsted acid sites/Lewis acid sites) in comparison with the zeolite Beta-0 synthesized without crosslinked starch. And the zeolite Beta synthesized with crosslinked starch treated by phosphorus modification (P-Beta-S(X%)-SA and CAT-S) presented higher hydrothermal stability after hydrothermal treatment at 820 degrees C under 100% steam for 17 h. In the catalytic cracking reactions of light diesel oil and heavy oil, P-Beta-S(X%)-SA and CAT-S provided remarkably enhanced activity and higher gasoline and butene yield. The mechanism of synthesis of zeolite Beta synthesized with crosslinked starch was also shown.

Automated summary

Zeolite Beta synthesized with crosslinked starch showed improved properties in terms of particle size, silanol group content, aluminum ratio, and acid site ratio compared to Zeolite Beta-0 without crosslinked starch. Phosphorus-modified Zeolite Beta synthesized with crosslinked starch exhibited enhanced hydrothermal stability and higher activity and yield in catalytic cracking reactions.