在FeO-Hydroxyapatite上支持的高度活跃和耐烧结的Pt集群通过定制强大的金属支相互作用来实现
Yunxia Liu1,2,3, Guandong Wu1,2, Rile Ge1,2
1CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
ACS applied materials & interfaces
|April 17, 2024
概括
将氧化铁引入氧化支物中,可以产生稳定的白金集群催化剂. 这种新型催化剂表现出高活性和耐CO氧化失活性,克服了传统支持的催化剂的局限性.
科学领域:
- 不同质的催化剂.
- 材料科学是一种材料科学.
- 纳米技术纳米技术
背景情况:
- 支持的金属催化剂,特别是以 (Pt) 为基础的催化剂,对于许多反应至关重要,但在高温下遭受失活.
- 强大的金属支相互作用 (SMSI) 可以增强稳定性,但往往会损害催化活性.
- 改善Pt催化剂稳定性的现有策略通常涉及活性和耐久性之间的权衡.
研究的目的:
- 开发一个支持的Pt集群催化剂,增强高温反应的活性和稳定性.
- 通过将氧化铁 (FeO) 引入酸 (HAP) 支中,微调强金属支相互作用 (SMSI).
- 调查FeO结合对Pt和HAP支持之间的相互作用的影响.
主要方法:
- 使用酸 (HAP) 合氧化铁 (FeO) 的支持的Pt集群催化剂的合成.
- 在100小时内对合成的催化剂进行CO氧化催化剂的催化试验.
- 使用先进技术分析催化剂结构和金属支相互作用的详细表征.
主要成果:
- 用FeO修改的HAP支持Pt集群催化剂表现出高的CO氧化催化活性.
- 催化剂表现出极好的烧结阻力和稳定性,在100小时的测试中没有观察到停用.
- 鉴定结果显示,FeO削弱了与Pt的共价金属支相互作用 (CMSI),并抑制了与HAP的氧化强金属支相互作用 (OMSI).
结论:
- 将FeO引入HAP是微调SMSI在支持的Pt催化剂中的有效策略.
- 修改后的催化剂在高活性和卓越的热稳定性之间取得了平衡.
- 这种方法为设计强大高效的支持金属催化剂提供了一个有前途的途径,用于苛刻的应用.
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