1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticl...1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticles was characterized by FTIR, TEM, XRD and XPS. The results confirmed that \KG-1/5C2OOHmim\·Cl ionic liquid combined with TiO 2 nanoparticles by chelation, the average diameter of TiO 2 nanoparticles was about 8 nm and anatase state was obtained. And only anatase existed even after calcinated at 750 ℃. As to the formation mechanism, we think that the inorganic-organic copolymerized surface-capped layer and repulsive force of positive charge played an important role in the formation and stabilization of TiO 2 nanoparticles.展开更多
设计合成了一系列烷基咪唑羧基功能化离子液体,采用FT-IR,~1 H NMR表征了其结构,采用正丁胺/乙腈电位滴定法分析其酸强度。该类羧基功能化离子液体在α-蒎烯的水油两相酸催化反应中表现出了较高的催化活性,考查了羧基个数、引入卤素等...设计合成了一系列烷基咪唑羧基功能化离子液体,采用FT-IR,~1 H NMR表征了其结构,采用正丁胺/乙腈电位滴定法分析其酸强度。该类羧基功能化离子液体在α-蒎烯的水油两相酸催化反应中表现出了较高的催化活性,考查了羧基个数、引入卤素等因素对催化性能的影响。结果表明,羧基及卤素基团的引入提高了水合产物的选择性。在催化剂[N-C_(14),N′-(CO_2H)_2-C_2H_2-Im-Br]_2HPW_(12)O_(40)用量0.25 mmol,水用量0.30mol,α-蒎烯用量0.06mol,80℃反应8h的条件下,α-蒎烯转化率达98.2%,α-松油醇的选择性为21.6%,水合产物的总选择性达33.9%。展开更多
文摘1-Methyl-3-carboxymethyl imidazolium chlorine（\C2OOHmim\Cl） ionic liquid surface-capped TiO 2 nanoparticles were prepared by using tetra-n-butyl titanate ethanol solution as a precursor. The structure of nanoparticles was characterized by FTIR, TEM, XRD and XPS. The results confirmed that \KG-1/5C2OOHmim\·Cl ionic liquid combined with TiO 2 nanoparticles by chelation, the average diameter of TiO 2 nanoparticles was about 8 nm and anatase state was obtained. And only anatase existed even after calcinated at 750 ℃. As to the formation mechanism, we think that the inorganic-organic copolymerized surface-capped layer and repulsive force of positive charge played an important role in the formation and stabilization of TiO 2 nanoparticles.
文摘设计合成了一系列烷基咪唑羧基功能化离子液体,采用FT-IR,~1 H NMR表征了其结构,采用正丁胺/乙腈电位滴定法分析其酸强度。该类羧基功能化离子液体在α-蒎烯的水油两相酸催化反应中表现出了较高的催化活性,考查了羧基个数、引入卤素等因素对催化性能的影响。结果表明,羧基及卤素基团的引入提高了水合产物的选择性。在催化剂[N-C_(14),N′-(CO_2H)_2-C_2H_2-Im-Br]_2HPW_(12)O_(40)用量0.25 mmol,水用量0.30mol,α-蒎烯用量0.06mol,80℃反应8h的条件下,α-蒎烯转化率达98.2%,α-松油醇的选择性为21.6%,水合产物的总选择性达33.9%。
