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为了提高5A分子筛对正构烷烃吸附分离的速率,以二甲基十八烷基[3-(三甲氧基硅基)丙基]氯化铵(TPOAC)为软模板剂,采用水热合成方法合成出具有微孔和介孔结构的多级孔道5A分子筛。结果表明,合成的分子筛以0.5 nm左右的微孔为主,介孔孔道集中在7~13 nm。通过改变模板剂用量可以调控合成分子筛的介孔数量。合成的多级孔道5A分子筛在保持对正构烷烃具有较高平衡吸附量的同时,显著提高正构烷烃在分子筛内的扩散系数,从而提高吸附分离的速率。
In order to improve the rate of the adsorption and separation of n-alkanes by 5A molecular sieves, dimethyltetradecyl [3- (trimethoxysilyl) propyl] ammonium chloride (TPOAC) was used as soft templating agent and hydrothermal method A multi-stage molecular sieve 5A molecular sieve with micropores and mesoporous structures was synthesized. The results show that the synthesized molecular sieve is mainly about 0.5 nm and the mesopores are concentrated at 7-13 nm. By changing the amount of template agent can control the synthesis of molecular sieve mesopores. The synthesized multi-stage molecular sieve 5A molecular sieve, while maintaining a high equilibrium adsorption of n-paraffins, significantly increases the diffusion coefficient of n-paraffins in the molecular sieve and increases the rate of adsorption and separation.