Oxidative Dehydrogenation of Ethane to Ethylene Over Mo-V-Nb Catalysts: Effect of Calcination Temperature and Type of Support

摘要

The development and implementation of a suitably active and selective Mo-V-Nb catalyst in ethane oxidative dehydrogenation was desirable and carried out in a micro-reactor system for the present study. Impregnation method was used to prepare the catalysts. The study established the effect of the parameters, namely, calcination temperatures and supports on the performance of Mo-V-Nb with Pd promoter catalysts. Catalyst samples were tested under reaction condition of temperatures 250, 280, 300 and 325°C, pressure 14.7 psi, flow rate 30 ml/min.gm (F/W) and the oxygen/ethane feed ratio of 1/3. Different supports, namely, alumina (SA-5239), silica (S151-10) and activated carbon were used. Palladium promoter was employed. Sensitivity analysis for the catalysts was carried out at different reaction temperatures. It was found that catalyst supported with silica S15110 gave better performance than catalyst supported with alumina SA-5239 and activated carbon. On the other hand it was noted that ethylene selectivity decreases by increasing the reaction temperature, while the selectivity of COx products increases with the increase of reaction temperature. Moreover, higher calcination temperatures were not favorable not only due to low C2H6and O2conversion, but also low C2Fl4 selectivity and yield and high COxselectivity and yield.