在高温CO2化过程中,Pt和TiO2之间的强金属支相互作用2
Xiaochun Hu1, Dan Xu2,3, Jianchun Jiang2,3
1School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210042, China.
鲁支金纳米颗粒中的氧气空缺增强了二氧化碳化过程的催化稳定性. 这防止了强金属支相互作用 (SMSI),改善了逆水气转移反应中的性能.
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.
- 表面化学 表面化学
背景情况:
- 金属支相互作用 (MSI) 极大地影响氧化物支的金属催化剂的活性和稳定性.
- 支持的表面特性如相位和缺陷是MSI的关键,包括强金属支持相互作用 (SMSI) 和电子金属支持相互作用 (EMSI).
研究的目的:
- 在高温二氧化碳化过程中调节SMSI在鲁支持的Pt纳米粒子 (NP) 上.
- 调查氧气空缺在增强催化稳定性和防止SMSI中的作用.
主要方法:
- 高温二氧化碳化实验在以路为支的Pt NP上进行.
- 密度函数理论 (DFT) 计算以了解电子相互作用.
- 通过缺陷对 Pt NP 表面的 TiO2-x 覆盖层进行受控调制.
主要成果:
- 氧空缺缺陷在800°C的逆水气转移反应 (RWGS) 中显著提高了Pt/rutile的催化稳定性.
- 有氧空缺的 pt/rutile 实现了 301 molCO⋅gM−1⋅h−1 的时空收益率,在 100 小时内稳定性仅下降了 8%.
- 由于氧空缺,DFT的计算表明,由于氧空缺,从Pt转移到鲁的电子减少,保持Pt的金属性质并抑制SMI.
结论:
- 在Pt/rutile催化剂上的氧气空隙在高温CO2化过程中有效地抑制了SMSI的形成.
- 氧化物支的缺陷工程提供了一个有希望的策略,以提高催化剂的稳定性和性能.
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