A Comparative Study Of Two Kinds Of Catalysts For Ethane Oxychlorination Reaction

Polyvinyl chloride is widely known as the world’s most widely used universal plastics. It has been widely used in industrial production and daily life and so on. Therefore, the high efficiency, green, low cost sustainable production of PVC is related to the overall economic strength of the whole country. At present, more than 99% of PVC is synthesized by vinyl chloride monomer. In the production of vinyl chloride, ethane oxychlorination is a relative green and one of the feasible methods. However, this method due to the lack of property catalyst and has not to realize the industrialization.In this paper, two kinds of catalysts were prepared by the sol-gel method. A class of Na modified spinel and copper chloride composite oxide catalyst Ni1-xNaxMn2O4-CuCl2/γ-Al2O3 (x=0,0.3,0.5,0.7), mainly for the determination of the series catalyst in ethane oxychlorination reaction of preparing for the catalytic activity of the vinyl chloride, and was characterized by XRD, XRF, ICP, BET, SEM, etc. The results show that the series of catalysts and Ni0.5Na0.5Mn2O4-CuCl2 /γ-Al2O3 catalytic activity is in this series the best and the ethane conversion rate reached 97%, vinyl chloride selectivity reached 36%; during reaction in 8 hours, conversion of ethane and ethylene chloride selectivity remained unchanged. Potassium modified copper base perovskite type La2-xKxCuO4/Al2O3 (x=0,0.1,0.3, 0.5) catalyst was measured the catalyst in ethane oxychlorination reaction of preparing vinyl chloride activity. The experimental results show that the La1.7K0.3CuO4/γ-Al2O3 activity is the best in the series, the conversion rate of ethane to 93%, the selectivity of the vinyl chloride reached 54%. During reaction in 8 hours, conversion of ethane and ethylene chloride selectivity remained unchanged, mainly from the control angle selectivity of ethane oxychlorination catalyst development considering the comparison, we think that La1.7K0.3CuO4/γ-Al2O3 catalyst is the best catalyst above the two kinds of ethane oxychlorination of vinyl chloride catalyst. Using XPS technique to analysis this two catalysts, La1.7CuO4/γ-Al2O3 and La1.7K0.3CuO4/γ-Al2O3 , XPS experiments found that copper on the surface of catalysts with different valences are the Cu2+ and Cu1+, rare earth lanthanum ions are three valence. The oxygen content of La1.7K0.3CuO4/γ-Al2O3 is greater than La1.7CuO4/γ-Al2O3, which may be one of the reasons that the catalyst has better catalytic activity.