Preparation Of Carbon Nitrogen Materials And Its Catalytic Performance In Vapor Phase Dehydrochlorination Of 1,1,2-Trichloroethane

1,1-Dichloroethene has many applications in industrial production and it holds great promise in developing a vapor phase catalytic dehydrochlorination process. Unlike the traditional production route of liquid phase dehydrochlorination of 1,1,2-trichloroethane(TCE) via the alkaline hydrolysis, the catalytic dehydrochlorination of TCE over solid catalyst in gas phase can be an environmentally friendly, 100% effective atom utilized and easy-functioning process. The low activity and sharply deactivation of conventional solid catalysts had always been great challenges in the gas phase TCE dehydrochlorination. Hence, it would be of great importance to develop a new catalyst for dehydrochlorination of TCE in gas phase. Recently, carbon nitride materials have received more and more attentions because of its unique characteristics such as semiconductivity, energy storage, and basicity. Herein, we introduce carbon nitride materials as a none-metal solid catalyst in selective catalytic dehydrochlorination of TCE into DCE reaction.The carbon nitride materials was synthesized by hard template method using SBA-15 as hard template, several precursors was used to fabricate a series of carbon nitride materials. Multiple catalyst characterization methods were applied on the catalysts. And the catalytic effect of the samples on selective catalytic dehydrochlorination of TCE into DCE reaction was further investigated. The results showed that higher surface area and more nitrogen content of the carbon nitride material facilitated the selective dehydrochlorination of TCE.Based on the former conclusion, we synthesized modified carbon nitride material by using dicyandiamide(DCDA) dissolved into N,N-dimethylformamide(DMF) as precursor in hope of getting a catalyst with better surface area and texture structure along with higher nitrogen content. The reaction result showed that the DMF modified carbon nitride catalyst performed better activity, DCE selectivity and stability.