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采用水热法成功合成了结晶度较好的MCM-41和Co-MCM-41分子筛,并对其进行了详细的表征,研究了MCM-41及Co-MCM-41对含喹啉模拟燃料和0~#柴油的吸附脱氮性能。实验确定MCM-41和Co-MCM-41合成的适宜条件为陈化时间1 h,晶化时间2 d。采用密度泛函方法模拟的喹啉分子尺寸结果为0.7116 nm×0.5002 nm,说明其可以很容易的进入MCM-41和Co-MCM-41的介孔孔道中,但Co-MCM-41分子筛的氮脱除率明显要高于MCM-41,说明Co的加入不仅提高了分子筛酸性,而且吸附脱氮性能增强。Co/Si摩尔比为0.06时,Co-MCM-41吸附脱氮性能最好,当比值高于0.06时,Co以Co_3O_4形式堵塞分子筛孔道,造成Co-MCM-41的吸附脱氮活性降低。
The MCM-41 and Co-MCM-41 molecular sieves with good crystallinity were successfully synthesized by hydrothermal method and characterized. The effects of MCM-41 and Co-MCM- 0 ~ # diesel adsorption denitrification performance. The optimum conditions for the synthesis of MCM-41 and Co-MCM-41 were determined as follows: aging time 1 h, crystallization time 2 d. The results of density functional theory of quinoline molecular size of 0.7116 nm × 0.5002 nm, indicating that it can easily enter the MCM-41 and Co-MCM-41 mesoporous channels, but the Co-MCM-41 molecular sieve nitrogen Removal rate was significantly higher than that of MCM-41, indicating that the addition of Co not only improves the molecular sieve acidity, but also enhances the adsorption denitrification performance. When Co / Si molar ratio was 0.06, Co-MCM-41 had the best adsorption and denitrification performance. When the ratio was higher than 0.06, Co occluded the molecular sieve pores with Co_3O_4, which led to the decrease of adsorption denitrification activity of Co-MCM-41.