Citation: 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. shu

Synthesis of polyoxymethylene dimethyl ethers over zeolite catalysts

CAO Jian ^1,2 ,
ZHU Hua-qing ^1,, ,
WANG Hui ¹ ,
HUANG Li-zhi ^1,2 ,
QIN Zhang-feng ¹ ,
FAN Wei-bin ^1,, ,
WANG Jian-guo ¹

1.
1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;

Corresponding author: ZHU Hua-qing, FAN Wei-bin,
Received Date: 27 January 2014
Available Online: 11 April 2014
Fund Project: 国家自然科学基金(21273264) (21273264)国家重点基础研究发展规划(973计划,2011CB201403,2011CB201406)。 (973计划,2011CB201403,2011CB201406)

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 DMM_2~8 selectivity was influenced by the acid strength and density of zeolites and reaction conditions. HMCM-22 showed much higher selectivity to DMM_2~8 than Al-YNU-1 and MOR. Under the optimal conditions, the DMM_2~8 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 DMM_n, while the strong acid sites werefor DMM.
- HMCM-22,
- polyoxymethylene dimethyl ethers,
- methylal,
- methanol,
- trioxane
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