硅源和铝源种类对SAPO-31分子筛物化性质及其催化正癸烷加氢异构化反应性能的影响

分别以硅气溶胶和硅溶胶为硅源，以异丙醇铝和拟薄水铝石为铝源，在水热体系中制备了一系列SAPO-31分子筛，并利用XRD、XRF、SEM、N₂物理吸附、NH₃-TPD、Py-IR等手段对其进行了表征，考察了硅源和铝源种类对SAPO-31分子筛结构和酸性的影响，并对分子筛样品负载Pd制备的Pd/SAPO-31双功能催化剂进行了正癸烷加氢异构化反应催化性能评价。结果表明，以硅溶胶为硅源、拟薄水铝石为铝源所制备的SAPO-31分子筛具有较大的比表面积和微孔孔体积，由其制备的Pd/SAPO-31催化剂在正癸烷加氢异构化反应中表现出更为优异的催化性能，正癸烷转化率为90.0%时，异癸烷选择性可达90.3%。

The Influence of Silicon and Aluminum Species on Physicochemical Properties and Catalytic Perfermance of SAPO-31 Molecular Sieve

A series of SAPO-31 molecular sieves were synthesized by hydrothermal method with fumed silica and silica sol as silicon source and aluminium isopropoxide and pseudoboehmite as aluminum source, respectively. The influence of silicon and aluminum species used in synthesis on the structure and acidic properties of synthesized SAPO-31  were investigated by the methods of XRD, XRF, N₂ physical adsorption, SEM, NH₃-TPD and Py-IR. The catalytic performance of the Pd/SAPO-31 bifunctional catalysts in n-decane hydroisomerization was evaluated. The results indicated that with silica sol as silicon source and pseudoboehmite as aluminum source, the synthesized SAPO-31 possessed an essence of larger specific surface area and micropore volume, catalyzed by which the n-decane hydroisomerization was excellent carried out with the selectivity of 90.3% for i-decane at n-decane conversion of 90.0%.