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实验室内外:封装金属集群用于大小选催化剂.

Zhen-An Qiao¹, Pengfei Zhang, Song-Hai Chai

¹Chemical Sciences Division, §Center for Nanophase Material Sciences, and #Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.

Journal of the American Chemical Society

|July 31, 2014

概括

研究人员开发了一种新的实验室内策略,用于先进的催化,在内使用金属. 这种核心外纳米圈设计能够实现特殊的尺寸选择性反应,并显示出高稳定性和可回收性.

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科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
催化剂是一种催化剂.

背景情况:

核心外纳米结构为催化提供了独特的特性.
控制金属集群大小和防止烧结对于催化活性至关重要.
微孔的二氧化外提供了保护性和尺寸选择性的环境.

研究的目的:

开发一种"实验室内外"战略,用于创建基于金属集群的多功能核心外纳米球.
为了研究这些纳米结构中限制的 (Pd) 集群的尺寸选择性催化性能.
评估氧化反应中合成的纳米催化剂的稳定性和可回收性.

主要方法:

空洞的二氧化纳米球的合成.
在纳米圈内封装聚合物点,以作为复杂化和封装剂.
在聚合物点矩阵内加载金属离子 (例如,Pd,Pt) 并随后形成金属集群.
由此产生的核心外纳米结构的表征和它们的催化活性的评估.

主要成果:

成功制备了多功能核心外纳米球,核心有金属集群 (Pd,Pt) 和微孔外.
通过Pd集群在基氧化中证明了异常大小选择性催化,区分不同分子大小的基质 (环烯与胆固醇酸盐).
实现了碳化合物和酒精的高效无溶剂有氧氧化,表现出高活性,热稳定性和可回收性.

结论:

实验室中的战略有效地创造了稳定的,大小控制的金属集群纳米催化剂.
核心外架构提高了催化性能,特别是在大小选择性反应中.
这些纳米结构对绿色和高效的催化应用具有重大前景.