JIN Guo-jie, GAO Huan-xin, YANG Hong-yun, CHEN Lu, DING Lin, KANG Chen-jun, XIE Zai-ku
(Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China)
Abstract: Si-HMSmesoporous material was hydrothermally synthesized with tetraethyl orthosilicate as Si source, 1-hexadecylamine as template, ethanol and water as solvent. Ti speices were incorporated into the framework of Si-HMS with TiCl4 as Ti source by vapor-phase grafting technology; In order to improve the hydrophobicity of Ti/HMS, methyl was grafted on the surface of Ti/HMS with Hexamethyl disilazane as methyl-silicon group agent by liquid-phase technology. The structure, surface chemical component and hydrophobic properties of Ti/HMS catalyst were characterized by XRD, N2 adsorption, TEM, UV-Vis and FT-IR, etc.; The performance of catalytic epoxidation of propylene by Ti/HMS was studied in a slurry bed reactor and a fixed-bed reactor using cumene hydroperoxide as oxidant, respectively. The results show that the prepared Ti/HMS catalysts possess a typical mesporous structure, and Ti species exist as the tetra-coordinated form in the framework; the hydrophobicity of Ti/HMS was obviously improved after it was treated with silane. The Ti/HMS catalyst treated by silane has excellent activity, selectivity and stability. In the period of 2400hr performance test, the CHP conversion was over 99.0%, the selectivity to PO was over 97.0%.
Key words: Titanium-containing HMS catalyst; Framework titanium; Cumene hydroperoxide; Propylene epoxidation
E-mail: jinguojie@163.com
Journal of Molecular Catalysis, Vol. 24, Issue 1, 2010, 6~11
