在MOF衍生的多孔TiO2上装载的单原子Pt,用于选择性化Halonitro-二的最大化Pt原子利用
Mingchun Guo1, Qiangqiang Meng1, Ming-Liang Gao1
1Hefei National Research Center for Physical Sciences at the Microscale, College of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
Angewandte Chemie (International ed. in English)
|October 29, 2024
概括
一种新的顺序热过渡策略可以精确控制TiO2支上的单原子 (Pt) 分散. 这种方法提高了关键化学反应的催化选择性和活性.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术纳米技术
背景情况:
- 控制单原子催化剂 (SAC) 在支上的位置是很困难的,经常埋葬活跃地点.
- 这种不可接近性限制了许多单原子催化剂的效率.
研究的目的:
- 在TiO2.2上开发单原子的首选表面分散策略.
- 提高单原子催化剂的催化性能和选择性.
主要方法:
- 采用了一种连续的热过渡策略.
- 金属有机框架 (MOF) 限制纳米颗粒 (PtNPs) 被转换为PtNPs和TiO2复合物,在800°C时被碳 (PtNPs&TiO2@C-800) 覆盖.
- 随后在600°C的温度下在空气中热驱动的PtNP原子化产生了单原子的Pt装饰TiO2 (Pt1/TiO2-600).
主要成果:
- Pt1/TiO2-600催化剂实现了单原子的100%可访问性.
- 与PtNPs/TiO2-400 (45%) 相比,观察到更高的p-chloroaniline (p-CAN) 选择性 (99%).
- 与随机分散的Pt1催化剂相比,在p-尼特罗 (p-CNB) 的化过程中注意到了增强的活性.
结论:
- 开发的策略有效地分散了TiO2.2的外表面上的单原子.
- 由此产生的催化剂在化反应中显著提高了活性和选择性.
- -NO2组的优先吸附和 -Cl组的弱吸附有助于提高性能.
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