【摘要】 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。更多还原

【Abstract】 The bi-function catalyst（C301/P-γ-Al₂O₃） was prepared from P-γ-Al₂O₃ obtained by modifying methanol dehydration catalystγ-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-γ-Al₂O₃ for synthesis of dimethyl ether（DME） from syngas by one step method over C301/P-γ-Al₂O₃（mass ratio of C301 to P-γ-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/（h·g）. 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.更多还原