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g-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。
Pd nanoparticles were immobilized on a tubular ceramic membrane support. The support surface was functionalized by N‐(β‐aminoethyl)‐γ‐aminopropyl trimethoxy silane (AAPTS), which contains two amino groups. The Pd‐immobilized ceramic membrane support was characterized by X‐ray diffraction, field‐emission scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, inductively coupled plasma emission spectroscopy, X‐ray photoelectron spectroscopy, and high‐resolution transmission electron microscopy. Its catalytic properties were investigated by the liquid phase hydrogenation of p‐nitrophenol to p‐aminophenol. The Pd‐immobilized ceramic mem‐brane support was compared with the Pd nanoparticles immobilized on a similar support function‐alized byγ‐amino‐propyltriethoxy silane (3‐APTS), which contains one amino group. Higher cata‐lytic activity and stability were observed for the AAPTS‐functionalized support. AAPTS contains twice as many amino groups as 3‐APTS, and consequently exhibited a stronger electron‐donating effect toward Pd. The AAPTS‐functionalized ceramic membrane support contained more immobi‐lized Pd nanoparticles, which were bound more strongly. This led to a higher catalytic activity and stability.
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