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首页> 外文期刊>Journal of Applied Polymer Science >Palladium nanocatalysts protected by polyacids
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Palladium nanocatalysts protected by polyacids

机译：多元酸保护的钯纳米催化剂

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Several colloidal palladium nanocatalysts prepared by the in, situ reduction of palladium chloride PdCl2, ammonium tetrachloropalladate (NH4)(2)PdCl4, and palladium acetate Pd(CH3COO)(2) were protected by various water-soluble polymers, with special emphasis on polyacids. The particle sizes, morphologies, and size distributions of the palladium nanoparticles were determined by transmission electron microscopy (TEM), and their catalytic activities were qualitatively tested by the hydrogenation of cyclohexene. The type of the polymer (for example, polyacid versus a nonionic, water-soluble polymer) can influence the nanoparticle sizes and morphologies, as well as colloidal stabilities. For the catalytic activities of these metal-polymer systems, the choice of the protective polymer can be equally important. Lower catalytic activities have been mostly found if polyacids were used as protective matrices for these palladium nanocatalysts. It was found to be important to consider several influences, such as the particle size and morphology, as well as the interaction between the polymer and the catalyst nanoparticle. Thus, the selection of the protective polymer is crucial for the development of tailored metal-polymer catalyst systems. Additional influences may stem from the presence of ions, for example, those from the metal precursor, or the counterions of the polymer side groups. (C) 1998 John Wiley & Sons, Inc. [References: 57]
机译：通过就地还原氯化钯PdCl2，四氯钯酸铵（NH4）（2）PdCl4和乙酸钯Pd（CH3COO）（2）制备的几种胶体钯纳米催化剂受到各种水溶性聚合物的保护，其中重点是多元酸。通过透射电子显微镜（TEM）测定钯纳米粒子的粒径，形貌和粒径分布，并通过环己烯加氢定性测试其催化活性。聚合物的类型（例如，多元酸与非离子水溶性聚合物）会影响纳米颗粒的大小和形貌以及胶体稳定性。对于这些金属-聚合物体系的催化活性，保护性聚合物的选择可能同样重要。如果将多元酸用作这些钯纳米催化剂的保护性基质，则通常发现较低的催化活性。已发现重要的是考虑多种影响，例如粒度和形态以及聚合物与催化剂纳米颗粒之间的相互作用。因此，保护​​性聚合物的选择对于开发定制的金属-聚合物催化剂体系至关重要。其他影响可能来自离子的存在，例如，来自金属前体的离子或聚合物侧基的抗衡离子。 （C）1998 John Wiley＆Sons，Inc. [参考：57]

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