Yongwen Jiang

Unprecedented 3D entanglement of 1D zigzag coordination polymers leading to a robust microporous framework

One-dimensional zigzag coordination chains in four different directions are hierarchically entangled to generate an unprecedented 3D interwoven framework, which exhibits permanent porosity and guest selectivity.

Highly Efficient Synthesis of Epichlorohydrin by Epoxidation of Allyl Chloride over Titanosilicate Ti-MWW

Abstract Liquid-phase epoxidation of allyl chloride with hydrogen peroxide was carried out over Ti-MWW, a novel titanosilicate with the MWW structure, to synthesize epichlorohydrin selectively and effectively. Ti-MWW proved to be superior to the conventional TS-1 catalyst in both catalytic activity and product selectivity. Ti-MWW prefers aprotic solvents of acetone and acetonitrile, both of which can restrain the solvolysis of epichlorohydrin, whereas TS-1 favors a protic solvent of methanol. It is possible to achieve the conversion of allyl chloride and the selectivity for epichlorohydrin as high as 99% on Ti-MWW.

Postsynthesis and catalytic properties of metallosilicates structurally analogous to MCM-56

A novel postsynthesis method for preparing various metallosilicates structurally analogous to MCM-56 has been developed. Highly crystalline MCM-56 zeolites were postsynthesized readily from corresponding MWW type lamellar precursors by a simple acid treatment at controllable temperatures. The titanosilicate analogue, Ti-MCM-56, thus obtained has been characterized by various techniques and applied to the liquid-phase oxidation of alkenes in comparison to three-dimensional (3D) Ti-MWW and Ti-Beta. Ti-MCM-56 with an open external surface showed a much higher activity for bulky molecules than Ti-MWW.