https://doi.org/10.15255/KUI.2009.011
Published: Kem. Ind. 58 (11) (2009) 507–514
Paper reference number: KUI-11/2009
Paper type: Original scientific paper
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Possibility of Using Sepiolite as the Matrix of FCC Catalysts

S. Q. Zheng, Y. Han, X. H. Huang, D. Qian, K. W. Tang, J. H. Yan and S. Ren

Abstract

The effect of acid concentration, time and temperature of modification on the magnesium removal from sepiolite modified by hydrochloric acid, sulfuric acid and nitric acid and on its effectiveness as an active matrix for FCC catalysts, were investigated. The modified sepiolite was characterized by XRD, SEM and N2 adsorption. The results show that the removal of magnesium, specific surface area, and pore specific volume of modified sepiolite are improved with increasing acid concentration, treating time and treating temperature. Hydrochloric acid appears preferable to the modification of sepiolite. The suitable acid modification conditions of sepiolite for FCC catalysts are 80 for 2.5 h with 1 mol L–1 HCl acid, under which the removal of magnesium in sepiolite is 27 %. With the modified sepiolite as an active matrix for FCC catalysts, the specific surface area, pore specific volume and mesopore pore specific volume of the catalysts can increase effectively, the catalysts exhibit excellent heavy-metal resisting performance and better cracking properties as a result of the introduction of magnesium oxide from the modified sepiolite.

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Keywords

sepiolite, acid modification, FCC catalyst, matrix