Citation: HONG Xin, TANG Ke. Preparation of heteroatomic mesoporous Ce-MCM-41 molecular sieve and its performance in the adsorptive removal of dimethyl sulfide[J]. Journal of Fuel Chemistry and Technology, ;2015, 43(4): 456-461. shu

Preparation of heteroatomic mesoporous Ce-MCM-41 molecular sieve and its performance in the adsorptive removal of dimethyl sulfide

HONG Xin ,
TANG Ke ^,

1.
School of Chemical and Environmental Engineering, Liaoning University of Technology, Jinzhou 121001, China

Corresponding author: TANG Ke,
Received Date: 31 October 2014

Fund Project: 辽宁省自然科学基金(2014020113) (2014020113)辽宁省高等学校优秀人才支持计划(LJQ2012057) (LJQ2012057)辽宁工业大学教师启动资金(X201311)。 (X201311)

Heteroatomic mesoporous Ce-MCM-41 molecular sieve was synthesized by using hydrothermal synthesis method with cetyltrimethy ammonium bromide (CTMABr) as template, cerium chloride as cerium source and sodium silicate as silica source. X-ray diffraction (XRD) and infrared spectrum (FT-IR) results indicate that the well-ordered meso-porous structure was obtained when the Ce/Si molar ratio is less than 0.04; Ce was incorporated into the framework of MCM-41. Nitrogen physisorption measurements indicate that the average pore diameters of MCM-41 and Ce-MCM-41 are 2.82 and 2.46 nm, with pore volumes of 0.762 1 and 0.689 4 m³/g and BET surface areas of 986.42 and 756.8 m²/g, respectively. Dimethyl sulfide with a molecular size of 0.464 8 nm can easily enter the meso-scale pores of MCM-41 and Ce-MCM-41. NH₃-TPD results illustrate that the acidity of Ce-MCM-41 is stronger than that of MCM-41. As a result, for the adsorptive removal of dimethyl sulfide from nitrogen with a dimethyl sulfide content of 58 μg/g, the desulfurization capacity of Ce-MCM-41 is 7.52 mg(S)/g, higher than that of MCM-41 (4.57 mg(S)/g). Furthermore, both MCM-41 and Ce-MCM-41 molecular sieves could be easily regenerated after adsorption of dimethyl sulfide; the desulfurization capacity can be recovered up to 80% of the original capacity after regenerated for three times.
- dimethyl sulfide,
- mesoporous molecular sieves,
- heteroatom,
- Ce-MCM-41,
- adsorption,
- desulfuration
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