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采用双氨基硅烷偶联剂N-β-(氨乙基)-γ-氨丙基三甲氧基硅烷(AAPTS)对陶瓷膜表面接枝功能化并负载钯纳米颗粒,制得一种有效的可重复使用的催化剂.利用X射线衍射、扫描电镜、电子能谱、感应耦合等离子体、X射线光电子能谱和高分辨透射电镜对催化剂进行了物性表征,并将其用于催化对硝基苯酚加氢制对氨基苯酚反应.和单氨基硅烷γ-氨丙基三乙氧基硅烷(3-APTS)功能化改性相比,担载在AAPTS功能化陶瓷膜上的钯纳米颗粒具有更高的催化活性和稳定性.相比于3-APTS,AAPTS分子中含有两个氨基,具有更强的供电子效应,因此钯纳米颗粒可更多更稳定地负载在AAPTS功能化陶瓷膜上,从而具有更高的催化活性和稳定性.
The surface of the ceramic membrane was grafted and functionalized with palladium nanoparticles by bis-aminosilane coupling agent N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane (AAPTS) to prepare an effective Reused catalyst.The physical and chemical properties of the catalyst were characterized by X-ray diffraction, scanning electron microscopy, electron spectroscopy, inductively coupled plasma, X-ray photoelectron spectroscopy and high-resolution transmission electron microscopy, and used for the catalytic analysis of p-nitrophenol Hydrogen to p-aminophenol.Compared with the functional modification of monoaminosilane γ-aminopropyltriethoxysilane (3-APTS), the palladium nanoparticles supported on AAPTS functionalized ceramic membranes had higher Catalytic activity and stability.Compared with 3-APTS, AAPTS molecules contain two amino groups, has a stronger electron donor effect, so the palladium nanoparticles can be more stable and more stable on the AAPTS functionalized ceramic membrane, which has Higher catalytic activity and stability.