碱基调控Pt纳米晶构型及其催化加氢性能

发布时间：2018-03-25 12:23

本文选题：Pt纳米晶　切入点：催化　出处：《化工进展》2017年04期

【摘要】：贵金属纳米晶对加氢反应具有良好的催化性能,特别是Pt纳米晶,其催化活性和选择性与纳米晶的纳米结构(形貌和尺寸)密切相关。由Gibbs-Wulff晶体生长定律可知,通过加入特定结构的封端剂可以有效控制纳米晶的形貌和尺寸。本文采用Na BH4在水溶液中还原Pt的前体H2Pt Cl6制备Pt纳米晶,并将其用于催化对硝基苯酚(p-NIP)的加氢反应。实验系统研究了碱基分子(如腺嘌呤A、鸟嘌呤G、胸腺嘧啶T、胞嘧啶C)及对应的核苷分子对Pt纳米晶构型和催化加氢活性的调控规律。研究发现,碱基分子和核苷分子对于Pt纳米晶的形貌以及尺寸具有明显的调控作用,通过不同结构生物分子的精密调控,实验制备得到了形貌和尺寸各异的Pt纳米晶。同时,所得Pt纳米晶在p-NIP的加氢反应中表现出了精密可调的催化性能。鸟嘌呤核苷、腺嘌呤核苷、β-胸腺嘧啶核苷调控制备的Pt纳米催化剂的TOFave均可达到无调控剂制备得到的催化剂的两倍以上,其中腺嘌呤核苷调控制备得到的Pt催化剂性能最好。
[Abstract]:Noble metal nanocrystals have good catalytic performance for hydrogenation, especially Pt nanocrystals. Their catalytic activity and selectivity are closely related to the nanostructures (morphology and size) of nanocrystals. The morphology and size of nanocrystalline can be effectively controlled by adding a specific structure capping agent. In this paper, Pt nanocrystals were prepared by reducing Pt precursor H2Pt Cl6 in aqueous solution by Na BH4. It was used to catalyze the hydrogenation of p-nitrophenol p-NIPs. The effects of base molecules (such as adenine A, guanine G, thymidine T, cytosine C) and their corresponding nucleoside molecules on Pt nanocrystalline configuration and catalytic hydrogenation activity were systematically studied. The regulation of sex. The base molecule and nucleoside molecule have obvious effect on the morphology and size of Pt nanocrystals. Through the precise control of biological molecules with different structures, Pt nanocrystals with different morphologies and sizes have been prepared. The obtained Pt nanocrystals exhibited a precise and adjustable catalytic performance in the hydrogenation of p-NIP. The TOFave of Pt nanocatalysts prepared by adenine nucleoside and 尾 -thymidine was more than twice as high as that prepared without regulatory agent, among which the Pt catalyst prepared by adenine nucleoside was the best.
【作者单位】：天津大学化工学院绿色合成与转化教育部重点实验室;
【基金】：国家自然科学基金(21306132) 博士点新教师基金(201200321200080)项目
【分类号】：TB383.1;O643.36

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