Ni_2P/Al_2O_3-SAPO-11催化剂的原位磷化法制备及其加氢异构化反应性能

以三苯基膦为磷化剂,采用原位磷化法制备具有较高分散性的Ni_2P/Al_2O_3-SAPO-11催化剂,通过低温N2吸附-脱附、XRD、HRTEM、NH_3-TPD和Py-IR等对催化剂晶相结构、微观形貌和酸性质进行表征。以正十四烷为模型化合物,考察SAPO-11含量及工艺条件对正十四烷加氢异构化性能的影响。结果表明,最佳SAPO-11质量分数为40%,优化的工艺条件为:反应温度360℃,反应压力2 MPa,体积空速1. 5 h-1,氢烃体积比300,该条件下,正十四烷转化率为78. 1%,异构化选择性为89. 2%。

Preparation of Ni2P/Al2O3-SAPO-11 catalysts by in situ phosphorization method for hydroisomerization of n-tetradecane

Ni₂P/Al₂O₃-SAPO-11 catalysts of high dispersion were successfully prepared by in situ phosphorization method with triphenylphosphine as phosphating agent and characterized by low temperature N₂ adsorption-desorption,XRD,HRTEM,XPS,TPR NH₃-TPD and Py-IR for identification of crystalline structure,morphology and acid property.Effects of SAPO-11molecular sieve contents and reaction conditions on hydroisomerization of n-tetradecane were evaluated in a fixed-bed reactor.It was found that the catalyst with the SAPO-11molecular sieve content of 40% showed the highest hydroisomerization activity and selectivity.Under the preferred conditions of reaction temperature of 360 ℃,reaction pressure of 2 MPa,LHSV of 1.5 h^-1and H₂/n-tetradecane volumetric ratio of 300,conversion of n-tetradecane was 78.1%,and isomerization selectivity reached 89.2%.