The application of mesoporous alumina with rich Brönsted acidic sites in FCC catalysts

Abstract

To decrease the coke yield while increase the conversion of FCC feedstock is of great significance as the crude oil becoming heavier and poorer in quality. In this work, the modified mesoporous alumina with rich Brönsted acidic sites (BAS) and reduced Lewis acidic sites (LAS) have been prepared by a sol-gel method. The modified γ-Al2O3 was characterized by X-ray diffraction, N2 sorption and FT-IR analysis and then used as the binder in FCC catalyst for catalytic activity tests. The results showed that the modified γ-Al2O3 (M-2) possessed a high BAS/LAS pyridine-IR band ratio of 0.75. The new catalysts with modified γ-Al2O3 (New-2) showed a good performance in increasing conversion of FCC feedstock by 8.55 % but reduced the coke yield by 3.25 % compared with catalyst of commercial alumina sol binder (C-AS). Besides, the New-2 increased the gasoline yield and diesel yield by 7.02 and 3.02 %.