用于双重催化的化Pt纳米颗粒
Hong Je Cho1, Doyoung Kim1, Jing Li2
1Department of Chemical and Biomolecular Engineering , University of Delaware , Newark , Delaware 19716 , United States.
Journal of the American Chemical Society
|September 25, 2018
概括
将纳米颗粒 (Pt NPs) 封装在焦化物催化剂中可以增强双重反应. 这种新的方法将和转化为所需的C8产品,提高了单催化过程的选择性.
科学领域:
- 不同质的催化
- 纳米材料科学
- 焦石的化学成分
背景情况:
- 将顺序反应集成到单步过程中对于高效的化学合成至关重要.
- 石矩阵为封装金属纳米粒子提供了一个有前途的平台,使得可控的催化环境成为可能.
- 涉及金属和酸位的双重反应是复杂的,往往导致不必要的副作用.
研究的目的:
- 开发一种使用阴离子聚合物辅助的策略在MFI热质中封装纳米粒子 (PtNP) 的方法.
- 研究Pt NP封装对涉及furfural和乙的双重反应的选择性的影响.
- 通过控制材料架构来证明产品分布在并联催化中的操作.
主要方法:
- 使用阴离子聚合物辅助方法合成封装Pt NP的MFI化物.
- 使用不同分子大小的基质的动力学研究量化Pt NP封装效率 (> 90%).
- 评估furfural和乙烯酸的合并凝和化中的催化性能.
主要成果:
- 在HZSM-5焦岩中实现了>90%的PtNP封装.
- 在HZSM-5中,有酸封装的PtNP选择性地催化了酸和酸的合并度和化,产生了87%的C8产物.
- 在HZSM-5中未封装的PtNP主要导致furfural的化和脱碳.
结论:
- 性聚合物辅助封装有效地将PtNP限制在MFI热质中,增强催化选择性.
- 焦化物矩阵内的Pt和酸位的空间排列指导着双重反应路径,有利于阿尔多尔凝结和化.
- 这项研究提供了通过封装定制催化材料架构来控制合反应产品分布的第一个证据.
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