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采用不同粒径的SiO2气溶胶为Si源,以二正丁胺为模板剂合成出纯相的SAPO-31分子筛,并采用XRD、SEM、BET、NH3-TPD等手段,对其结构和酸性进行了表征。通过浸渍法制备了0.5%Pd/SAPO-31双功能催化剂,并在固定床反应装置上考察了其对正癸烷加氢异构化的催化反应性能。结果表明,当SiO2气溶胶粒子尺寸较小时,有利于更多的硅引入分子筛的骨架,所合成的SAPO-31分子筛具有更多的酸中心,所制备的双功能催化剂对正癸烷加氢异构化反应具有更高的反应活性和异构化选择性。
The pure silica phase SAPO-31 molecular sieve was synthesized by using SiO2 aerosols with different particle sizes as Si source and di-n-butylamine as template. The structure and acidity of SAPO-31 molecular sieves were investigated by XRD, SEM, BET and NH3- Characterization. The bifunctional 0.5% Pd / SAPO-31 catalyst was prepared by impregnation method. The catalytic performance of the catalyst for hydroisomerization of n-decane was investigated on a fixed bed reactor. The results show that when the size of SiO2 aerosol particles is small, more silicon is introduced into the framework of the molecular sieve, and the synthesized SAPO-31 molecular sieve has more acid centers. The prepared bifunctional catalyst has the advantages of n-decane hydrogenation The structuring reaction has higher reactivity and isomerization selectivity.