伊利石合成SAPO-11分子筛及其临氢异构化性能

以酸洗伊利石为原料，采用水热法合成SAPO-11分子筛，采用等体积浸渍法制备成型SAPO-11分子筛催化剂，采用XRD、N₂吸附-脱附、SEM和TEM等分析手段对SAPO-11分子筛样品进行了分析表征，考察合成条件对合成SAPO-11分子筛晶相结构的影响，并以正辛烷为模型化合物评价了成型SAPO-11分子筛催化剂的临氢异构化反应性能。结果表明：以酸洗伊利石为原料合成SAPO-11分子筛的最佳条件为：晶化温度180 ℃，晶化时间36 h，n(SiO₂)/n(Al₂O₃)=0.5，n(P₂O₅)/n(Al₂O₃)=1.2，n(模板剂)/n(SiO₂)=3.5；在反应压力1.5 MPa、反应温度360 ℃、质量空速1.5 h^-1、V(H₂)/V(正辛烷)=300的条件下，以正辛烷为模型化合物在Ni/SAPO-11分子筛催化剂作用下进行临氢异构化反应，正辛烷转化率为52.94%、异构体收率为42.95%、单支链异构体的选择性为74.28%、双支链异构体的选择性为6.85%，该催化剂异构化反应性能较好。

Synthesis of SAPO-11 Molecular Sieve From Illite and Its Catalytic Performance in Hydroisomerization

SAPO-11 molecular sieve was synthesized by hydrothermal method with acid leaching illite as raw material. The synthesized SAPO-11 molecular sieve was characterized by XRD, N₂ adsorption-desorption, SEM and TEM. Influences of synthesis conditions on the crystalline structure of SAPO-11 molecular sieve were investigated, and its catalytic performance was evaluated by n-octane hydroisomerization reaction. Results show that the optimal synthesis conditions for the synthesis of SAPO-11 molecular sieve using acid leaching illite are as follows: crystallization temperature of 180 ℃, crystallization time of 36 h, n(SiO₂)/n(Al₂O₃) of 0.5, n(P₂O₅)/n(Al₂O₃) of 1.2, n(Template)/n(SiO₂) of 3.5. It is shown that the mentioned SAPO-11 molecular sieve displays good catalytic performance in hydroisomerization. Under the conditions of reaction pressure of 1.5 MPa, reaction temperature of 360 ℃, mass space velocity of 1.5 h^-1, V(H₂)/V(n-octane)=300, the conversion is 52.94%, the yield of isomers is 42.95%, the selectivity of single-branch isomers is 74.28%, and the selectivity of double-branch isomers is 6.85%, the catalyst has good hydroisomerization performance.