燃料化学学报2011，Vol.39Issue(12)：918-923,6.
分子筛催化剂上甲醇与三聚甲醛缩合制聚甲醛二甲醚
Synthesis of polyoxymethylene dimethyl ethers from methanol and trioxymethylene with molecular sieves as catalysts
摘要
Abstract
Polyoxymethylene dimethyl ethers (PODEn or DMMn) were synthesized by the condensation of methanol and trioxymethylene over the catalysts of several molecular sieves like HY, HZSM-5, Hp and HMCM-22; the effect of their acidic properties on product distribution was investigated. The results indicated that the acidic molecular sieves, especially HMCM-22, are catalytically active for the condensation of methanol and trioxymethylene to form DMMn. Over HY, the main product is dimethoxymethane (DMM), with a selectivity of 92. 87%. Over HZSM-5 and Hp, the main products turn to be DMM1~3 and the yields of DMM3~8, which are ideal additives for diesel fuel, reach 6.40% and 13.78% , respectively. With HMCM-22 as the catalyst, the formation of long chain DMMn products is further enhanced and the yield of DMM3~8 attains 29. 39%. The results of NH3-TPD demonstrated that the product distribution is related to the surface acidic properties of the catalyst used; short chain DMM may be primarily formed on weak acidic sites, while the acidic sites of medium strength can enhance the formation of diesel fuel additive components DMM3~8.关键词
分子筛/聚甲醛二甲醚/甲醇/三聚甲醛/HMCM-22Key words
molecular sieves/ polyoxymethylene dimethyl ethers/ methanol/ trioxymethylene/ HMCM-22分类
化学化工引用本文复制引用
赵启,王辉,秦张峰,吴志伟,武建兵,樊卫斌,王建国..分子筛催化剂上甲醇与三聚甲醛缩合制聚甲醛二甲醚[J].燃料化学学报,2011,39(12):918-923,6.基金项目
国家重点基础研究发展计划(973计划,2011CB201400,2010CB234603) （973计划,2011CB201400,2010CB234603）
中科院知识创新方向项目(KJCX2.YW.H16) （KJCX2.YW.H16）
国家自然科学基金(10979068,20876163). （10979068,20876163）
