Intra-crystalline mesoporous SAPO-11 prepared by a grinding synthesis method as FCC promoters to increase iso-paraffin of gasoline
Résumé
A hierarchical SAPO-11 was prepared by a grinding synthesis method (GSM) and added as a promoter to increase the iso-paraffin yield of gasoline in fluid catalytic cracking (FCC) reaction. Compared tothe classical hydrothermal method, the GSM leads to thecreation of intra-crystalline mesopores with the assistance of a surfactant (Cetyltrimethyl Ammonium Bromide, CTAB). CTAB acts asa structure directing agentand as a hard template during the crystallization of SAPO-11. CTAB micelles formedthe intra-crystalline mesoporesin the SAPO-11 crystals.Theintra-crystalline mesoporosity of the SAPO-11is preservedat 800 o C understeaming, which render the materialas an appropriate component of the FCC catalyst.Besides, the presence of mesopores provides isomerization active sites and accelerates the desorption of iso-paraffin. The mesoporous SAPO-11 showed a higher selectivity for iso-paraffin and the yield of iso-paraffin increased by 2%.
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