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Figure 16. Changes in products’ selectivities with n-hexane conversion on HB(77) (A); HB(77)-AT(0.05M) (B); HB(77)-AT(0.2 M) (C); and HB(77)-AT(0.05 M)-NT(1 M) (D) catalysts. Reaction conditions: see Figure 12. Products abbreviations: see Figure 11. 2.3.1. Effect of Dealumination As shown in Figures 10–12 Al-rich HB(12) showed a poor catalytic stability, a low propylene selectivity and a high BTX selectivity at the high temperature of 923 K. The inferior catalytic performance can be explained by two possible reasons. One reason may be related to the large amount of acid sites (Table 1), which would accelerate the secondary reactions of propylene and butenes and the hydride transfer, leading to a large amount of coke being formed (163 mg/g-catalyst at TOS of 210 min). The other reason may be related to the special structure of Beta zeolite. The polymerization of olefins and the successive formation of coke components may predominantly occur in the three dimensional 12-MR micropores and their wide intersections [6]. Note 93PDF Image | Zeolite Catalysis
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