Selective hydrogenation by highly-dispersed and highly-loaded noble metallic nanoparticulate catalysts

在本研究中，首先，制备方法的建立，然后制备的催化剂进行了工业应用测试。在第一年，为了建立在载体颗粒上的选择性沉积技术，研究了从其溶液中选择性沉积金属纳米颗粒如Ru、Rh、Pd、Ir和Pt的研究项目。即，首先，在溶液相中在精确控制条件（主要是pH）下制备金属（例如Ru、Rh、Pd、Ir和Pt）的目标络合物，以在载体颗粒的表面上选择性地形成它们的氧化物或氢氧化物。接下来，通过分散和老化载体粉末，例如二氧化钛、赤铁矿和二氧化硅的单分散颗粒，在固体表面上选择性地产生贵金属氢氧化物。最后，通过氢还原形成金属贵金属纳米颗粒。在第二年，在第一年所获得的结果的基础上，主要研究了贵金属纳米颗粒作为催化剂的应用。首先考察了1-辛烯加氢制辛烷的活性。在这方面，将制备的贵金属纳米颗粒催化剂与常规催化剂进行比较。从这一点来看，我们的催化剂表现出非常高的加氢活性。此后，测试催化剂的选择性。考虑到在本研究中使用的无孔载体粉末，苯加氢制环己烯作为连续加氢反应的例子进行了测试。最后，考察了用本方法制备的贵金属纳米颗粒催化剂上CO加氢生成有机化合物的反应。

In the present study, first of all, the preparation method was established and then as-prepared catalysts were tested for industrial use. In the first year, in order to establish the selective deposition technique onto the support particles, the research project on the selective deposition of metallic nanoparticles, such as Ru, Rh, Pd, Ir, and Pt from, its solution was investigated. Namely, first of all, target complexes of metal, such as Ru, Rh, Pd, Ir, and Pt, was prepared in the solution phase under the precise control of conditions, mainly pH, in order to form their oxide or hydroxide selectively on surfaces of the support particles. In the next, noble metal hydroxide was selectively generated on the solid surfaces by dispersing and aging support powders, such as monodispersed particles of titania, hematite, and silica. Finally, metallic noble nanoparticles were formed by the hydrogen reduction. In the second year, based on the results obtained in the first year, application of noble nanoparticles as a catalyst was mainly investigated. First of all, the activity of hydrogenation of 1-octent to octane was investigated. As-prepared noble nanoparticulate catalysts were compared with a conventional catalyst in this regard. From this point of view, our catalyst exhibited remarkably high activity for the hydrogenation. Hereafter, the selectivity of the catalysts was tested. Taking it into the consideration that nonporous support powders were used in the present study, the hydrogenation of benzene to cyclohexene was tested as an example of successive hydrogenation reaction. Finally, CO hydrogenation to form organic compounds was investigated over the noble nanoparticulate catalysts prepared by the present method.