Synthesis and Catalytic Cracking Performance of Small-Sized NaY Zeolite/Kaolin Composites with High Framework SiO2/Al2O3 Ratio

Abstract

Abstract: Small-sized NaY zeolite/kaolin composites with high framework SiO₂/Al₂O₃ ratio were hydrothermally synthesized from two kaolins with different particle sizes. The structure and morphology of composites were characterized by XRD, SEM, grain size analysis and N₂ physical adsorption techniques. The results show that compared with commercial NaY, the structure stability and hydrothermal stability of samples synthesized from kaolin are significantly improved. The grain size of the sample synthesized from fine kaolin is 310 nm, and the specific surface area is 807 m²·g^-1. The catalytic cracking catalysts were prepared by using modified NaY zeolite/kaolin composite as active component. The acidity of the catalysts was characterized by NH₃-TPD, and the heavy oil catalytic cracking performance was evaluated on microreactor. The results show that the acid center strength of sites on catalysts increases with the increase of framework SiO₂/Al₂O₃ ratio, while the acid center amount decreases. The grain size of NaY zeolite/kaolin composites synthesized from fine kaolin is smaller. The number of acid centers and catalytic cracking performance of catalysts prepared by small-sized NaY zeolite/kaolin composites are greatly improved. With the increase of m(calcined kaolin)/m(metakaolin), the content of substrate in NaY zeolite/kaolin composites increases, while the acid center strength of catalysts decreases. The catalyst prepared by the sample with framework SiO₂/Al₂O₃ molar ratio of 6.1 and m(calcined kaolin)/m(metakaolin) of 0.5 presents excellent catalytic cracking performance of heavy oil. And the conversion rate of heavy oil (diesel excluded) is as high as 85.4%, and the gasoline yield is up to 64.2%.

Key words: NaY zeolite, kaolin, NaY zeolite/kaolin composite, hydrothermal method, SiO₂/Al₂O₃ ratio, grain size, catalytic cracking

CLC Number:

TQ426.6

WANG Wenkai, TAN Juan, WANG Shihan, QIU Xin. Synthesis and Catalytic Cracking Performance of Small-Sized NaY Zeolite/Kaolin Composites with High Framework SiO₂/Al₂O₃ Ratio[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3479-3489.

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Synthesis and Catalytic Cracking Performance of Small-Sized NaY Zeolite/Kaolin Composites with High Framework SiO₂/Al₂O₃ Ratio

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