Technological conditions for dimethyl ether synthesis from CO_2 hydrogenation

Methanol synthesis catalyst C207 and dehydration catalyst HZSM-5 were mixed to prepare bifunctional catalyst for dimethyl ether synthesis from CO_2 hydrogenation. Catalytic activities were evaluated on micro fixed-bed reactor. Effects of temperature, pressure, H_2/CO_2 mole ratio, space velocity on reaction were studied. Results showed that temperature affects catalytic activity markedly , the higher temperature is beneficial to improve reaction rate and suitable temperature is 260～270 ℃; the higher pressure and H_2/CO_2 ratio are contributable to improve CO_2 conversion and DME yield; suitable space velocity is (1 500)～(3 000) h~(-1).