Catalytic Performance of HZSM-5 Molecular Sieve for Synthesis of Polyoxymethylene Dimethyl Ethers

doi:10.3724/SP.J.1088.2012.20337

Abstract

Abstract: Polyoxymethylene dimethyl ethers (PODE_n) were synthesized using methanol (MeOH) and trioxymethylene (TRI) as raw materials. Catalytic performance of acidic molecular sieve HZSM-5 catalyst and PODE_n selectivity were found to be strongly dependent on silica/alumina ratio, particle size, phosphorus modified and etc. A series of HZSM-5 zeolite samples modified with various contents of phosphorus were prepared by impregnation with an ammonium dihydrogen phosphate. The crystal structure, pore structure, and surface acidity of the catalyst were studied by various characterization techniques such as X-ray diffraction, N₂-adsorption, and temperature-programmed desorption of NH₃. Under the mild reaction conditions of 130 °C and raw materials mass ratio MeOH/TRI = 2, methanol conversion and the PODE_n (n = 2–5) selectivity were 95.2% and 62.9%, respectively, by using the Pd-modified HZSM-5 catalyst with the optimum conditions (molar ratio of Si to Al was 50, particle size was 5 μm, low-P₂O₅ content (w = 0–6%) for the preparation). Catalytic performance of HZSM-5 was higher than that of reference commercial catalysts.

Key words: polyoxymethylene dimethyl ether, methanol, trioxymethylene, HZSM-5 zeolite, fuel additive

GAO Xiao-Chen, YANG Wei-Min, LIU Zhi-Cheng, GAO Huan-Xin. Catalytic Performance of HZSM-5 Molecular Sieve for Synthesis of Polyoxymethylene Dimethyl Ethers[J]. Chinese Journal of Catalysis, 2012, 33(8): 1389-1394.

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