Experimental Study of the hydrogenation of carbon dioxide slurry bed step synthesis of dimethyl ether
|School||Kunming University of Science and Technology|
|Keywords||CO2 hydrogenation Methanol synthesis catalyst HZSM-5 zeolite Dimethyl Ether Methanol|
Carbon dioxide ( CO2 ) is one of the main greenhouse gas , dimethyl ether ( DME ) is an important organic chemical products . With industrial development , the carbon dioxide content in the atmosphere increasing number , greatly contributed to the deterioration of the living environment of mankind , the synthesis of dimethyl ether by hydrogenation of carbon dioxide is an important way for the effective use of carbon dioxide . Dimethyl ether synthesis from CO2 hydrogenation reaction process of hydrogenation of carbon dioxide methanol synthesis , methanol dehydration to dimethyl ether and carbon dioxide and hydrogen reverse water gas shift reaction . In this study, industrial catalytic performance excellent SCTM - 98 and XNC -602 ( the main component of CuO-ZnO-Ar2O3) as methanol synthesis catalyst ( 25,38,50 ) HZSM-5 zeolite , silica-alumina as methanol dehydration catalyst . Two catalysts at a certain quality than mechanically mixed to prepare a series of synthesis of dimethyl ether compound catalyst for the hydrogenation of carbon dioxide slurry bed one-step synthesis of dimethyl ether research , and of these composite catalysts in slurry bed catalytic performance . The results showed that the composite catalyst for methanol synthesis catalyst SCTM - 98 activity , better dewatering performance of the composite catalyst HZSM-5 zeolite with silica to alumina ratio of 38 . Also studied methanol synthesis component dehydration component mass ratio of the catalytic properties of the composite catalyst , the results show that the methanol synthesis and methanol dehydration catalyst mass ratio of 2:1 composite catalytic performance , Then the combination of the two catalysts is preferably suitable for the two catalysts active play . Compared with the other catalyst under the same reaction conditions as having higher CO2 conversion rate, selectivity and yield of dimethyl ether . In addition , this study also examines the impact of different temperature, pressure , space velocity and hydrogen to carbon ratio of reaction conditions on the Catalyst Performance , and under different conditions, carbon dioxide hydrogenation of CO2 conversion and methanol , DME selectivity variation , initially identified the optimal reaction conditions for the temperature of 260 ° C, a pressure of 3.0 MPa , space velocity of 2400h - 1 and hydrogen to carbon ratio of 3 . 36.6% of the carbon dioxide conversion rate was 38.4 % , the selectivity of dimethyl ether , methanol selectivity of 48.5% . These studies are very valuable .