Alcohols-assisted synthesis of framework Ti-rich TS-1 zeolites for the epoxidation of 1-hexene
Abstract
Titanosilicate-1 (TS-1) has garnered widespread interest on account of its distinctive catalytic properties on the efficient oxidation of long-chain linear α-olefins (LAOs) into industrially useful epoxides. In TS-1, the active framework Ti are limited, while the inactive anatase lead to the hampering of catalytic activity. Herein, the effect of different alcohols on Ti species in TS-1 was investigated. It was demonstrated that the suitable content of alcohols may lead to the generation of TS-1 zeolites that are abundant in framework Ti species. The 1-hexene conversion in epoxidation reaction with H2O2 was significantly improved compared with the conventional TS-1. Among the different alcohol additives, ethylene glycol was best benefit to the formation of more framework Ti, on which 1-hexene conversion increased from 46% to 67% and the selectivity of 1,2epoxyhexane remains at a relatively high level.
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