利用磷酸浸渍改性甲醇脱水催化剂γ-Al2O3得到的P-γ-Al2O3与甲醇合成催化剂C301制备双功能催化剂(C301/P-γ-Al2O3).以C301/P-γ-Al2O3为催化剂,液体石蜡为溶剂,在浆态床反应器中研究合成气一步法制二甲醚(DME),考察了反应温度、压力、空速和合成气中的CO2含量对一步法制DME的影响.结果表明,反应温度、压力、空速及合成气中的CO2含量对合成DME均有较大影响,磷改性双功能催化剂可适应含CO2的合成气制DME,并可提高DME选择性,增加DME收率.在液体石蜡150 mL,催化剂用量为溶剂质量的7.3%,氢和一氧化碳物质的量之比为2,反应温度为270℃,反应压力4.3 MPa和空速为600 mL/(h·g)的条件下,CO单程转化率可达到93%以上,DME选择性大于60%.该催化剂的稳定性比较好,可承受较宽的温度、压力和空速的波动范围.%The bi-fiinction catalyst(C301/P-y-Al2O3) was prepared from P-y-Al2O3 obtained by modifying methanol dehydration catalyst y-Al2O3 through phosphorus acid dipping method and methanol synthesis catalyst C301. The effects of reaction temperature, reaction pressure, space velocity and CO2 content in the syngas on the catalytic performance of C301/P-y-Al2O3 for synthesis of dimethyl ether(DME) from syngas by one step method over C301/P-y-Al2O3(mass ratio of C301 to P-y-Al2O3 4) using liquid paraffin as solvent were investigated in the slurry bed. The results showed that the conversion of CO2 and the selectivity of DME reached 93% and 60%, respectively, under the conditions of liquid paraffin 150 mL, mass ratio of catalyst to liquid paraffin 7.3%, molar ratio of H2 to CO 2, reaction temperature 270 ℃, reaction temperature 4.3 Mpa, space velocity 600 mL/(hg). The conversion of total carbon(CO and CO2) and CO decreased, conversion of H2, selectivity and yield of DME increased when CO2 was added to syngas. The bi-function catalyst exhibited relatively stable catalytic performance in a wide fluctuation of reaction temperature, pressure and space velocity.
展开▼
