【摘要】 研究了杨梅形聚丙烯腈合铂（APA—Pt（0））和杨梅形聚肟偕亚氨二乙酸合铂（API—Pt（0））催化苯乙烯加氢反应,发现APA—Pt（0）的催化活性随—CN/Pt摩尔比增大而有所提高,但在氢化过程中逐渐下降;API—Pt（Ⅳ）用氢气或KBH₄还原,所得API—Pt（0）的活性均低于APA—Pt（0）;API—Pt（0）用盐酸处理后,活性显著提高,在氢化过程中催化活性基本不变。根据实验结果,认为高分子载铂催化剂的催化活性与胶态铂（0）微粒的形成历程、粒径尺寸及其在树脂表面的聚集态有关。更多还原

【Abstract】 Hydrogenation of styrene at room temperature under 1 atm of hydrogen in ethanol catalyzed by "arbutus" polyacrylonitrile-platinum (APA-Pt(0)) and "arbutus" poly-(oxime -imidodiacetate)-platinum (API-Pt(0)) was investigated. The rate of hydrogenation of styrene by APA-Pt(0) was found to be faster than that of API-Pt(0). It increases with increasing molar ratio of the acrylonitrile residues in APA to platinum and, however, reduces gradually throughout the hydrogenation. The catalytic activity of API-Pt(0) is rather low when it is obtained either by hydrogenation under a hydrogen atmosphere or reaction with potassium borohydride. When the catalyst API-Pt(0) is treated with hydrochloric acid, the rate of hydrogen uptake is enhanced remarkably. The catalytic activity of API-Pt (0) for hydrogenation of styrene is unchange within 16 hours. These experimental results show that the catalytic activity of the polymer-supported platinum catalysts is governed to a great extent by the formation mechanism and the particle size of the colloidal platinum (0), as well as the aggregation state of the colloidal particles located near the surface of the beads.更多还原