Cobalt Series Nano-catalyst Preparation And Study Its Application In Epoxidation Of Styrene

Epoxidation of oxygen is is useful chemical fine productions and intermediate in the production of many pharmaceuticals (For instance, UV-absorbent, perfume and pharmaceutical industry, and so on). The epoxidation of olefin has attracted the interest of many researchers in recent years. Because olefin have the activity of C=C double bond in the molecule, so that the traditional heterogeneous catalyst will make many by-product (for example:benzoic acid, benzaldehyde, hyacinthin) in reaction process of synthesis. Hence, it is of great significance in application aspect to design a low price, sample operation, non-pollution, easily recycled catalysts which could catalyze olefin eopxidation efficiently.We successfully synthesized cobalt nanoparticles in mesoporous silica spheres of catalyst and cobalt nanoparticles in carbon nanotubes of catalyst in this paper, respectively. We characterized the catalysts by many methods and used them in epoxidation of olefin. Outlined as follows:1. Carbon spheres were synthetized by colloidal glucose, carbon spheres and cobalt nanoparticles as hard template. Then the hard template was coated by tetraethoxysilane (TEOS) and Cetyltrimethyl Ammonium Bromide (CTAB) is auxiliaries. At last the magnetic hollow mesoporous silica spheres were synthesized by calcination. We used ICP, TEM, EDX, XPS, XRD and VSM to characterize the catalysts. Under the condition of flow oxygen, DMF and100℃, the Co/HMS shows prominent catalytic activity in epoxidation of styrene with98%conversion and94%selectivity for3hours can be recycled five times without significant loss in activity. At last, the catalysts showed prominent catalytic activity in other olefin, too.2. We used the CNTs as support, the cobalt nanoparticles were sucked in lumen wall of CNTs by the capillary force. The catalysts of Co/CNTs were synthesized by calcination, and the catalysts characterize by ICP, TEM, EDX, XPS, XRD and VSM., under the condition of flow oxygen, DMF and100℃, the catalysts of Co/CNTs(in) shows prominent catalytic activity in epoxidation of styrene with99.1%conversion and92.8%selectivity for1hours can be recycled multiple times without significant loss in activity.