Add time:07/26/2019         Source:sciencedirect.com

Titanium-zirconium mixed oxide microspheres and titanium oxide microcubes have been prepared by using sol-gel processes, which are further modified by chiral sulfonyl chloride in order to improve their activities for oxidation of alkenes. Characterizations reveal that the titanium-zirconium microspheres are solid, but substitution of zirconium with l-(+)-sodium tartrate produces microcubes featuring titanium oxide, which has a hollow structure. In catalysis, both microspheres and microcubes show satisfactory conversions of alkenes, as well as promising outputs of high-valued oxidized products. The linkage of chiral sulfonyl chloride looks efficient for improving catalysis. There is a kind of synergy between metal oxide and attached ligand, which plays a key role in catalytic outputs. Lastly, hydrogen peroxide appears to be a promising oxidant for transformation of aliphatic alkenes. This work puts forward micron-sized titanium materials with interesting structures, which also exhibit satisfactory activity for oxidation of alkenes.

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