氧化铁负载铂纳米簇催化卤代硝基苯本体氢化性质研究

发布时间：2018-03-25 11:06

本文选题：铂　切入点：金属纳米簇　出处：《物理化学学报》2017年05期

【摘要】：复相金属催化剂中的载体效应研究具有重要意义。我们以结构不同的氧化铁载体吸附"非保护型"Pt金属纳米簇制备了具有相同Pt纳米簇的Pt/Fe_3O_4、Pt/γ-Fe_2O_3和Pt/α-Fe_2O_3催化剂,考察了其在无溶剂条件下(本体条件)催化邻氯硝基苯(o-CNB)选择性氢化反应的性能,发现三种铂/氧化铁催化剂的催化选择性远高于商购铂/碳催化剂,Pt/γ-Fe_2O_3和Pt/α-Fe_2O_3的催化选择性明显高于Pt/Fe_3O_4,而Pt/Fe_3O_4的催化活性较Pt/α-Fe_2O_3高50%。铂/氧化铁对不同卤代硝基苯的本体选择性氢化反应表现出优良的催化性能,相应卤代苯胺产物的选择性均可达到99%以上。考察了温度、氢气压力对Pt/Fe_3O_4催化o-CNB本体氢化性能的影响。本工作为理解氧化铁负载金属纳米簇催化剂的特殊催化性质,进而发展高效金属纳米簇基催化体系提供了新的基础。
[Abstract]:It is of great significance to study the carrier effect in multiphase metal catalysts. We prepared the Pt / Fe _ 3O _ 4 / 纬 -Fe _ 2O _ 2O _ 3 and Pt/ 伪 -Fe _ 2O _ 2O _ 3 catalysts with the same Pt / Fe _ 3O _ 3O _ 4 and Pt/ 伪 -Fe _ 2O _ 2 _ 2O _ 3 catalysts by adsorbing "unprotected" Pt metal nanoclusters on different ferric oxide carriers. The selective hydrogenation of o-chloronitrobenzene (o-CNB) catalyzed by o-chloronitrobenzene under solvent-free conditions was investigated. It was found that the catalytic selectivity of the three Pt / Fe oxide catalysts was much higher than that of Pt / 纬 -Fe _ 2O _ 3 and Pt/ 伪 -Fe _ 2O _ 3 compared with that of Pt / 纬 -Fe _ 2O _ 3 and Pt/ 伪 -Fe _ 2O _ 2O _ 3, while the catalytic activity of Pt/Fe_3O_4 was 50% higher than that of Pt/ 伪 -Fe _ 2O _ 2O _ 3. Selective hydrogenation shows excellent catalytic performance. The selectivity of corresponding halogenated aniline products can be over 99%. The effects of temperature and pressure of hydrogen on the hydrogenation of o-CNB catalyzed by Pt/Fe_3O_4 were investigated. The purpose of this work was to understand the special catalytic properties of iron oxide supported metal nanocluster catalysts. Thus, the development of high efficient metal nanoclusters-based catalytic system provides a new basis.
【作者单位】：北京交通大学理学院化学系;北京大学化学与分子工程学院分子动态与稳态结构国家重点实验室北京分子科学国家实验室;
【基金】：国家自然科学基金(21573010) 科技部国家重点研发计划项目(2016YFE0118700) 北京交通大学人才基金(2015RC070)资助~~
【分类号】：O643.36

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