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分子筛催化剂催化合成聚甲氧基二甲醚
引用本文:曹健,朱华青,王辉,黄立志,秦张峰,樊卫斌,王建国.分子筛催化剂催化合成聚甲氧基二甲醚[J].燃料化学学报,2014,42(8):986-993.
作者姓名:曹健  朱华青  王辉  黄立志  秦张峰  樊卫斌  王建国
作者单位:1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China
基金项目:国家自然科学基金(21273264);国家重点基础研究发展规划(973计划,2011CB201403,2011CB201406)
摘    要:以甲醇、甲缩醛和三聚甲醛为原料,考察了分子筛孔道结构、晶粒粒径、酸性及反应体系对合成聚甲氧基二甲醚反应性能的影响,并筛选出最佳反应条件。结果表明,HMCM-22分子筛具有良好的催化性能。在最佳反应条件下,以甲醇与三聚甲醛为原料,DMM2~8的选择性为65.1%;而以甲缩醛和三聚甲醛为原料,DMM2~8的选择性则达到90.6%。NH3-TPD结果表明,弱酸位有利于三聚甲醛解聚为甲醛,中强酸位促进长链分子生成,而强酸位导致DMM为主要产物。

关 键 词:HMCM-22  聚甲氧基二甲醚  甲缩醛  甲醇  三聚甲醛  
收稿时间:2014-01-27

Synthesis of polyoxymethylene dimethyl ethers over zeolite catalysts
CAO Jian;ZHU Hua-qing;WANG Hui;HUANG Li-zhi;QIN Zhang-feng;FAN Wei-bin;WANG Jian-guo.Synthesis of polyoxymethylene dimethyl ethers over zeolite catalysts[J].Journal of Fuel Chemistry and Technology,2014,42(8):986-993.
Authors:CAO Jian;ZHU Hua-qing;WANG Hui;HUANG Li-zhi;QIN Zhang-feng;FAN Wei-bin;WANG Jian-guo
Institution:CAO Jian;ZHU Hua-qing;WANG Hui;HUANG Li-zhi;QIN Zhang-feng;FAN Wei-bin;WANG Jian-guo;State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences;University of Chinese Academy of Sciences;
Abstract:Synthesis of polyoxymethylene dimethyl ethers was carried out on HMCM-22, Al-YNU-1 and MOR zeolites by the condensation of trioxane and methanol or methylal. The crystal structures and surface acidity of the catalysts were characterized by XRD, SEM and NH3-TPD. It was found that DMM2~8 selectivity was influenced by the acid strength and density of zeolites and reaction conditions. HMCM-22 showed much higher selectivity to DMM2~8 than Al-YNU-1 and MOR. Under the optimal conditions, the DMM2~8 selectivity reached 65.1% and 90.6% in ME/TRIox and DMM/TRIox systems respectively. It was shown that the moderately strong acid sites were probably responsible for the formation of long chain DMMn, while the strong acid sites werefor DMM.
Keywords:HMCM-22  polyoxymethylene dimethyl ethers  methylal  methanol  trioxane  
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