磷改性双功能催化剂合成二甲醚性能研究  

Study on performances of P-modified bifunctional catalyst for dimethyl ether synthesis

作　　者：黄兵[1] 张世玲[2] 谢磊磊[1] 

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

出　　处：《天然气化工—C1化学与化工》2011年第4期38-41,共4页Natural Gas Chemical Industry

基　　金：云南省科技计划项目省应用基金(2003E0027M)

摘　　要：采用磷酸水溶液浸渍-焙烧法对甲醇脱水催化剂γ-Al2O3改性,得到磷改性甲醇脱水催化剂P-γ-Al2O3与C301甲醇合成催化剂以1:4的质量比混合制备成C301/p-γ-Al2O3双功能催化剂用于一步法合成二甲醚,该改性双功能催化剂比未改性催化剂具有更高的催化活性。将该催化剂用于浆态床反应器,在p=3.7MPa,T=250℃,进料合成气n(H2)/n(CO)=2的条件下,CO转化率从93.11%提高到95.90%,DME选择性从34.61%提高到42.27%。改性催化剂经FT-IR、BET、XRD手段进行表征,发现在P-γ-Al2O3中增加了O=P-O键,使得脱水催化剂的表面总酸量和L酸中心数量同时增加,从而提高了双功能催化剂的活性。Abifunctional catalyst（C301/P-γ-Al2O3） for one-step synthesis of dimethyl ether from syngas was prepared by the method as follows： γ-Al2O3 was modified by impregnation with phosphoric acid aqueous solution and calcination to obtain the P-γ-Al2O3,which was then mixed with the commercial methanol synthesis catalyst C301 in a mass ratio of 1：4.The P-modified catalyst had higher activity than the unmodified catalyst.The modified catalyst was used in a slurry bed reactor and the conversion of CO increased from 93.11% to 95.90% while the DME selectivity increased from 34.61% to 42.27% under pressure of 3.7MPa,temperature of 250℃ and feed gas H2/CO molar ratio of 2.The P-γ-Al2O3 catalyst was characterized by FT-IR,XRD and BET,and it was found that the O=P-O bond existed in the P-γ-Al2O3,which made the numbers of both total acid and L acid sites of the P-γ-Al2O3 surface increased that resulted in the improvement of the activity of the prepared bifunctional catalyst.

关 键 词：磷改性 Γ-AL2O3 双功能催化剂 二甲醚合成 磷酸 

分 类 号：O643[理学—物理化学]