SO_3/γ-Al_2O_3固体酸催化剂的制备、结构与酸性表征  

Preparation of SO_3/γ-Al_2O_3 Solid Acid Catalyst and Characterization of Its Structure and Acidity

作　　者：姚瑞平[1] 张铭金[1] 杨俊[2] 易德莲[1] 徐君[1] 邓风[2] 岳勇[2] 叶朝辉[2] 

机构地区：[1]武汉科技大学化学系,武汉430081 [2]中国科学院武汉物理与数学研究所波谱与原子分子物理国家重点实验室,武汉430071

出　　处：《化学学报》2005年第4期269-273,共5页Acta Chimica Sinica

基　　金：国家重大基础研究前期专项基金(No.2002CCC02200);国家自然科学基金(No.20273082)

摘　　要：用酸中和法制备了活性γ-Al2O3,并在其表面负载SO3得到固体酸催化剂SO3/γ-Al2O3,用XRD,TG-DTA,FT-IR,NMR,NH3-TPD等对其进行了结构和酸性研究.结果表明:在SO3/γ-Al2O3的制备过程中形成少量的Al2(SO4)3,同时SO3与γ-Al2O3表面上的羟基反应,形成强的Br?nsted酸位,根据H/27Al双共振(TRAPDOR)MASNMR与FT-IR实验1结果提出了Br?nsted酸结构模型.SO3/γ-Al2O3表面存在两种不同强度的酸中心,其酸强度大于分子筛HZSM-5,但弱于传统的固体超强酸SO24/γ-Al2O3.-A solid acid catalyst SO3/γ-Al2O3 was prepared by adsorption of SO3 gas onto the surfaces of ac- tivated γ-Al2O3. The structure and acidity of the catalyst were studied by XRD, NMR, FT-IR, TG-DTA and NH3-TPD method. The results indicated that SO3 reacted with activated γ-Al2O3 to form a small quantity of Al2(SO4)3, and at the same time, the adsorption of SO3 on the surface of γ-Al2O3 introduced two different kinds of Br?nsted acid sites, which can be attributed to two different acid hydroxyl groups, including the bridging hydroxyl groups (S-OH-Al, giving rise to an H resonance at ca. δ 4.3) and the terminal hydroxyl 1 groups attached to S atoms (S-OH, giving rise to an H resonance at ca. δ 11.2). The structure of Br?nsted 1 acid sites on the surface of catalyst SO3/γ-Al2O3 has been proposed based on H/27Al TRAPDOR and FT-IR 1 results. The acid strength of SO3/γ-Al2O3 is stronger than that of zeolite HZSM-5, but still weaker than that of SO24 /γ-Al2O3, which is a conventional solid superacid catalyst. - Preparation of SO3/γ-Al2O3 Solid Acid Catalyst and Characterization of Its Structure and Acidity YAO, Rui-Pinga ZHANG, Ming-Jin*, a,b YANG, Junb YI, De-Liana XU, Juna DENG, Fengb YUE, Yongb YE, Chao-Huib (a Department of Chemistry, Wuhan University of Science and Technology, Wuhan 430081) (b State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071) Abstract A solid acid catalyst SO3/γ-Al2O3 was prepared by adsorption of SO3 gas onto the surfaces of ac- tivated γ-Al2O3. The structure and acidity of the catalyst were studied by XRD, NMR, FT-IR, TG-DTA and NH3-TPD method. The results indicated that SO3 reacted with activated γ-Al2O3 to form a small quantity of Al2(SO4)3, and at the same time, the adsorption of SO3 on the surface of γ-Al2O3 introduced two different kinds of Br?nsted acid sites, whi

关 键 词：SO3 Γ-AL2O3 固体酸催化剂 制备 FT-IR 固体超强酸 分子筛 酸性 NH3-TPD NMR 

分 类 号：O643.3[理学—物理化学]