C301/P-γ-Al_2O_3双功能催化剂一步合成二甲醚  

Synthesis of Dimethyl Ether over C301/P-γ-Al_2O_3 Catalyst

作　　者：陈樑[1] 章江洪[2] 张世玲[3] 谢磊磊[1] 

机构地区：[1]昆明理工大学环境科学与工程学院,云南昆明650093 [2]昆明理工大学理学院,云南昆明650093 [3]昆明冶金高等专科学校建材院,云南昆明650033

出　　处：《化学反应工程与工艺》2011年第4期348-352,362,共6页Chemical Reaction Engineering and Technology

基　　金：云南省科技计划项目省应用基金(2003E0027M)

摘　　要：利用磷酸浸渍改性甲醇脱水催化剂γ-Al_2O_3得到的P-γ-Al_2O_3与甲醇合成催化剂C301制备双功能催化剂(C301/P-γ-Al_2O_3)。以C301/P-γ-Al_2O_3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CO_2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CO_2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CO_2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-function catalyst（C301/P-γ-Al2O3） was prepared from P-γ-Al2O3 obtained by modifying methanol dehydration catalyst γ-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.

关 键 词：合成气 二氧化碳 双功能催化剂 磷改性 γ-三氧化二铝 二甲醚 浆态床 

分 类 号：TQ426.64[化学工程] TQ223.24