Narrow Results

Heteroatomic mesoporous Ce-MCM-41 molecular sieve was synthesized by using hydrothermal synthesis method. X-ray diffraction (XRD) and Infrared spectrophotometer (IR) results indicated that the well-ordered mesostructure was obtained and Ce had been introduced into the framework of MCM-41. Nitrogen adsorption-desorption results indicated that the average pore diameters of MCM-41 and Ce-MCM-41(Ce/Si molar ratio=0.04) were 3.24 and 3.85 nm, with pore volumes of 0.4256 and 0.8721 m³/g, Brunauer-Emmett-Teller (BET) surface areas of 587.65 m²/g and 612.35 m²/g respectively. The molecular size of dimethyl sulfide, calculated by using density functional theory (DFT), was 0.4648 nm, implying that the dimethyl sulfide easy accessed to the mesoscale pores of mesoporous molecular sieve. NH₃-TPD results illustrated that the acidity of Ce-MCM-41(Ce/Si=0.04) was 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 (that was 30 μg (S)/g), the desulfurization capacity of Ce-MCM-41(Ce/Si=0.04) was 7.52 mg(S)/g, higher than that of MCM-41 (4.57 mg(S)/g).