Ni-MCM-41分子筛合成及其对模拟柴油吸附脱氮性能研究

以十六烷基三甲基溴化铵为模板剂、以硝酸镍为镍源，采用水热合成法合成Ni-MCM-41杂原子分子筛，并对其进行红外光谱（IR）、X射线衍射（XRD）及N2吸附-脱附表征。IR和XRD结果表明样品具有MCM-41分子筛的介孔结构，镍离子已进入分子筛骨架，N2吸附-脱附结果得出Ni-MCM-41杂原子分子筛的比表面积为523 m2/g，平均孔径为2.82 nm，孔体积为0.625 8 cm3/g。研究了Ni/SiO2摩尔比对分子筛吸附脱除含吡啶模拟柴油碱性氮化物的影响，确定Ni/SiO2摩尔比为0.01的Ni-MCM-41分子筛吸附脱氮效果最佳。考察了分子筛用量、吸附温度、吸附时间对Ni-MCM-41（0.01）分子筛吸附脱氮性能的影响，结果表明最佳吸附脱氮条件为：分子筛用量为0.02 g/mL（相对于模拟柴油），吸附温度为40 ℃，吸附时间为20 min。

PREPARATION OF MOLECULAR SIEVE NI-MCM-41 AND ITS ADSORPTIVE DENITROGENATION PERFORMANCE OF SIMULATED DIESEL

Ni-MCM-41 heteroatom molecular sieve was synthesized by hydrothermal synthesis method, using nickel nitrate as Ni source and hexadecyl trimethyl ammonium bromide as the template and characterized by IR, XRD and nitrogen adsorption. IR and XRD results indicated that Ni was entered into the framework of MCM-41. Nitrogen adsorption analysis determined that the specific surface area of Ni-MCM-41 heteroatom molecular sieve was 523 m2/g，the average pore size was 2.82 nm，and the pore volume was 0.625 8 cm3/g. The effects of Ni/SiO2 molar ratio on pyridine adsorption indicated that the Ni-MCM-41 molecular sieve with Ni/SiO2 molar ratio of 0.01 had the best nitrogen removal rate. The effects of molecular sieve dosage, adsorption temperature and adsorption time on adsorptive denitrogenation by Ni-MCM-41 (0.01) were investigated, It was recognized that the best denitrogenation conditions were as follows：molecular sieve dosage of 0.02 g per mL simulative diesel, adsorption temperature 40 ℃ and adsorption time 20 min.