高稳定性的核壳结构贵金属催化剂研究
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- 英文论文题名：Preparation of Core-Shell Nanostructures and Their Catalytic Properties
- 论文作者：李宝珍 ; 董文钧
- 英文论文作者：Li Baozhen ; Dong Wenjun ; School of Materials Science and Engineering ; University of Science and Technology Beijing ; Faculty of Science ; Zhejiang Sci-Tech University
- 年：2016
- 作者机构：北京科技大学纳米复合材料与绿色催化研究室;北京科技大学材料科学与工程学院;浙江理工大学纳米科技研究中心;浙江理工大学理学院;
- 论文关键词：核壳结构 ; Pt@C ; 催化剂
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十七分会：纳米催化
- 语种：中文
- 分类号：O643.36
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十七分会 ; 纳米催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：262k
- 原文格式：D
- 会议级别：全国
摘要
纳米贵金属催化剂具有巨大的表面能,易因团聚而导致其失活,常用介孔材料作为壳层来保护纳米贵金属粒子,进而得到高稳定性的核壳型催化剂。本研究提出一种以乙酰丙酮铂和葡萄糖为原料,通过一步水热制备出多核核壳结构的Pt@C纳米颗粒的方法,以对硝基苯酚为降解物测试其催化活性,并采用SEM,TEM,XRD,Uv-vis等测试手段对所制备样品的结构和催化性能进行了表征,探讨了反应时间和葡萄糖加入量对其结构的影响。结论表明,实验得到了介孔的Pt@C颗粒,尺寸为100nm左右,碳层厚度为30nm;水热温度为180℃,反应时间为4h,对对硝基苯酚催化活性最高。该方法绿色环保,操作简单,多核结构可提供较多活性位点,介孔碳层具有较高热稳定性和耐化学腐蚀性,可有效避免贵金属铂活性组分的聚集和流失,有效提高了贵金属的利用率。
Nanostructured noble metal catalysts, with large surface energy, easily lead to the deactivation due to the aggregation of the nanoparticles, Recently, porous shell on noble metal nanoparticles was developed to improve the stability and reactivity. In this paper, a multi-core Pt-nanoflowers@C core-shell structures were prepared by a one-pot hydrothermal reactions with acetylacetone platinum and glucose as raw materiasl. The as-obtained diameter of nanoflowers of the Pt@C nanostucture is about several nm and the thickness of the mesoporous carbon layer is about 30 nm. The multi-core structure can provide more active sites and mesoporous carbon layer, increase the stability of the catalyst and avoid aggregating and loosing of Pt nanoflowers, which can effectively improve the catalytic efficiency of noble metal catalyst.
Nanostructured noble metal catalysts, with large surface energy, easily lead to the deactivation due to the aggregation of the nanoparticles, Recently, porous shell on noble metal nanoparticles was developed to improve the stability and reactivity. In this paper, a multi-core Pt-nanoflowers@C core-shell structures were prepared by a one-pot hydrothermal reactions with acetylacetone platinum and glucose as raw materiasl. The as-obtained diameter of nanoflowers of the Pt@C nanostucture is about several nm and the thickness of the mesoporous carbon layer is about 30 nm. The multi-core structure can provide more active sites and mesoporous carbon layer, increase the stability of the catalyst and avoid aggregating and loosing of Pt nanoflowers, which can effectively improve the catalytic efficiency of noble metal catalyst.
引文
[1]Dong,W.J.;Zhang,L,F.Appl.Catal.B-Environ.2015,180:13-19.
[2]Tang,S.J.Phys.Chem.C.2010,114(2):977-982.
[3]Sun,S.;Wang,W.;Zhang,L.Catal.Commun.2009,11:290-293.
[2]Tang,S.J.Phys.Chem.C.2010,114(2):977-982.
[3]Sun,S.;Wang,W.;Zhang,L.Catal.Commun.2009,11:290-293.