在泰坦尼亚支持的Au催化剂中,湿化学强金属支相互作用
Jian Zhang1,2, Hai Wang3, Liang Wang3
1Key Laboratory of Applied Chemistry of Zhejiang Province, Department of Chemistry , Zhejiang University , Hangzhou 310028 , China.
Journal of the American Chemical Society
|January 25, 2019
概括
一种新的湿化学方法为金色催化剂在上产生强烈的金属支相互作用 (SMSI). 这种方法避免了纳米粒子烧结,并通过形成保护性氧化层来增强CO氧化活性.
科学领域:
- 不同质的催化
- 材料科学
- 纳米技术
背景情况:
- 强大的金属支相互作用 (SMSI) 对支金属纳米粒子催化剂至关重要.
- 传统的SMSI方法通常涉及高温氧化还原处理,冒着纳米颗粒烧结的风险.
- 需要采用能够保持纳米粒子完整性的替代SMSI构造方法.
研究的目的:
- 引入一种新的湿化学方法来构建SMSI.
- 在 (Au/TiO2) 支持的金纳米颗粒上演示湿化学SMSI (wcSMSI).
- 研究wcSMSI修饰的CO氧化催化剂的催化性能.
主要方法:
- 使用湿化学方法,涉及水溶液中的Auδ+和Ti3+前体之间的氧化还原相互作用.
- 通过分析覆盖 Au 纳米粒子的 TiO x 覆盖层来描述 wcSMSI.
- 研究了Au和TiO2之间的电子相互作用以及Au纳米粒子上CO吸附的抑制.
主要成果:
- 在Au/TiO2纳米粒子上成功构建了wcSMSI.
- 观察到一个TiO x覆盖层,电子相互作用和抑制的CO吸附,证实了wcSMSI.
- 经过修改的Au-TiO x接口表现出增强的氧化还原特性,改善了CO氧化中的氧化激活.
- 氧化物覆盖层提供了显著的稳定性,从而产生了耐烧结的催化剂.
结论:
- 湿化学SMSI (wcSMSI) 提供了传统高温方法的有效替代方案.
- wcSMSI方法可以防止纳米颗粒烧结并增强催化活性.
- 开发的Au/TiO2-wcSMSI催化剂在二氧化碳中表现出卓越的性能和稳定性.
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