钛硅分子筛催化剂高效钛位点的理性构筑与调控及催化烯烃环氧化的性能

Abstract

<p indent="0mm">With the continuous promotion of high-end strategy for chemicals, the titanium silicalite-1 (TS-1) has attracted wide attention due to its unique oxidizing ability. The TS-1 has widespread applications in a series of reactions such as olefin epoxidation, cyclohexanone ammoxidation, and phenol hydroxylation. Therefore, the TS-1 is labeled as a milestone in the field of molecular sieve catalysis. Rational design and precise construction of high-performance TS-1 are the key to catalyze olefin epoxidation. This article summarizes three strategies for constructing high-performance titanium sites in TS-1, which involves designing specific coordination forms of titanium sites at the atomic scale, adjusting the microenvironment of titanium sites on the interface, and improving the accessibility of titanium sites in the particle. Moreover, the action modes and reaction mechanisms of different strategies are elaborated in detail, and corresponding constructing methods and characterization means are summarized. Furthermore, the current challenges and future perspectives about high-performance titanium sites are further proposed.