Abstract
Publisher Summary This chapter introduces the skeletal isomerization of hexene-1. The acid amounts and strengths of different molecular sieves are determined by TPD of ammonia. The ammonia desorption peak temperature is used to characterize acid strength. The weak and moderate acid strength is similar for different molecular sieves. But the amount of acid center and strength of strong acid center are quite different. The products of hexene-1 conversion include C3, C4, C5, C6, and >C6 compounds, neither methane nor ethane was detected. The production of C4, C5, and C6+ indicates that there are dimerization and the following cracking reaction during hexene-1 conversion. The cracking product yield and C6+ products yield may be controlled by acid strength of acid center and pore structure together. SAPO-11 presents a unidimension system with 10-MR opening. The amount of acid center is close to ZSM-5-90, but the strength is much lower. So the dimerization and cracking reaction is blocked. The hexene-1 conversion and iso-C6 yield of SAPO-11 is quite close to Beta and ZSM-5-90, which is correlated to the amount of weak + moderate acid center.
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