超薄的原子层沉积了Al2O,外层稳定了Al2O3Pt/Ni-Foam化催化剂
Azina Rahmani1, Maksim A Sultanov2,3, Kemah Kamiru-White1
1Department of Chemistry, University of Central Florida, Orlando, Florida 32816, United States.
ACS applied materials & interfaces
|September 11, 2023
概括
这项研究使用原子层沉积氧化 (Al2O3) 在泡上开发了强大的超低负载 (Pt) 催化剂. 这些增强的催化剂表现出极好的稳定性和高活性,用于化 styrene.
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:
- 在可持续的化学过程中,开发具有最低贵金属负载的稳定和高活性催化剂至关重要.
- 泡是一种有前途的支材料,但通常需要修改以提高催化剂性能和耐用性.
研究的目的:
- 为了创建一个超低负载的支持催化剂,增强稳定性和活性.
- 研究氧化外层在催化剂结构完整性和性能中的作用.
主要方法:
- 电交换以种植金纳米结构在泡上.
- 作为保护层的超薄氧化 (Al2O3) 的原子层沉积.
- 在空气下火以形成最终支的催化剂结构.
- 通过在低温和低压下化功能化烯进行催化试验.
主要成果:
- 在坚固的泡支上实现了超低的负荷 (0.020 ppm).
- 2O3外层显著提高了纳米颗粒的稳定性和氧化纳米板的结构完整性.
- 催化剂在10次回收试验中表现出高的物理强度和保留的活动.
- 在非功能化烯化过程中实现了9.5 × 10^6 h^-1的高周转频率 (TOF).
- 在没有芳香环化的情况下,对素替代剂 (F,Cl,Br) 具有很好的耐受性.
结论:
- 原子层沉积Al2O3是一种有效的策略,可以创建高度稳定的,超低负载支持的催化剂.
- 开发的催化剂表现出优越的耐用性和活性,用于选择性 styrene 化.
- 这种方法为具有成本效益和高效的催化过程提供了一条途径.
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