Low-temperature selective oxidation of methane to ethane and ethylene over BaCO_3/La_2O_3 catalysts prepared by urea combustion method

摘要

A series of BaCO_3/La_2O_3 catalysts have been prepared using urea combustion method,and tested their activity in oxidative conversion of methane to ethane and ethylene below 600 deg C.For 5% BaCO_3/La_2O_3 catalyst,under integral conditions,CH_4 conversion of 31.8% with C_2 selectivity of 45.9% have been obtained at 320 deg C.With the increase of BaCO_3 contents,CH_4 conversion and C_2 selectivity are improved.The temperature profiles of reactor have been described and found that the distribution of hot spots on catalyst bed is related to the low-temperature activity of catalyst.