Preparation of vinyl chloride ethane oxychlorination catalyst deactivation mechanism and its

Title: Preparation of vinyl chloride ethane oxychlorination catalyst deactivation mechanism and its Author: Sen Degree-granting units: Inner Mongolia University Keywords: double perovskite;; ethane oxychlorination;; inactivation;; vinyl chloride Summary:

People ethane oxychlorination reaction began in the 1990s, restricting its industrialization, the main problem is the low thermal stability of the catalyst, short life. In this paper, high temperature of the double perovskite composite oxide as a catalyst to solve the catalyst for Neodymium Magnets ethane oxychlorination process with low thermal stability of the defect, for the realization of large-scale industrial production to create the conditions.

In this paper, the sol - gel prepared La2FeCuO6, La2CoCuO6, La2NiCuO6 three kinds of double-perovskite-type rare earth oxides, the use of XRD, XPS, H2-TPR, FT-IR, BET, SEM, magnetic, TG- DSC, ICP-AES by means of the structure and properties of catalysts were characterized by ethane oxychlorination reaction as a probe to study the three catalysts for ethane oxychlorination reaction performance, catalyst deactivation of the main factors and the reaction conditions on catalytic activity.

Experimental results show that, in air atmosphere at 900 ℃ calcined for 4h La2FeCuO6, La2CoCuO6, La2NiCuO6 three kinds of catalysts are formed double perovskite-type rare earth oxides. Ethane which La2FeCuO6 the highest rate reached 76.8%; La2NiCuO6 vinyl chloride catalyst selectivity is best to reach 42%. Three kinds of thermal stability of catalysts are better than traditional Cu-K-La/γ-Al2O3 catalyst. After considering the yield of vinyl chloride, La2FeCuO6 the best performance of the catalyst. By the catalyst XRD.XPS, H2-TPR, magnetic characterization shows that this experiment three kinds of vinyl chloride catalyst selectivity with B 'bit of metal ions on the electronegativity, ethane conversion and catalyst oxygen vacancy concentration.

Orthogonal test of reaction temperature, catalyst, feed ratio and reaction time on the ethane oxychlorination reaction, results show that the reaction temperature and amount of catalyst in the reaction of ethane ethane oxychlorination rate significant impact; http://www.everbeenmagnet.com/en/products/110-sintered-neodymium-magnets   reaction temperature of vinyl chloride and HCl selective flow significantly affected.

Deactivation of the catalyst through the analysis, La2FeCuO6 structure of the catalyst during the reaction gradually collapsed, and gradually build LaOCl phase; carbon catalyst surface is embedded; active component in the reaction of Cu before and after a serious loss. Degree Year: 2010