Robust Pt@TiOx/TiO2 Catalysts for Hydrocarbon Combustion: Effects of Pt-TiOx Interaction and Sulfates
Robust Pt@TiOx/TiO2 Catalysts for Hydrocarbon Combustion: Effects of Pt-TiOx Interaction and Sulfates
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稳健的Pt@TiOx/TiO2碳氢化合物燃烧催化剂：Pt-TiOx相互作用和硫酸盐的影响
DOI：
10.1021/acscatal.0c03984
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发表时间：
2020-11-20
期刊：
影响因子：
12.9
通讯作者：
Liu, Shuang
中科院分区：
文献类型：
--
作者：
Hao, Hao;Jin, Baofang;Liu, Shuang
开发在低温下对碳氢化合物燃烧具有高活性的铂催化剂是至关重要的，但仍具有挑战性，因为铂可能在氧化气氛中转化为惰性PtOx，并在催化燃烧期间失活。在这篇文章中，Pt@TiOx/TiO 2催化剂与铂纳米粒子修饰无定形TiOx覆盖层通过强金属-载体相互作用（SMSI）相关的策略合成。Pt-TiOx电子相互作用在反应期间稳定了反应性Pt-0位点，导致C3 H8和C3 H6燃烧的突出活性和高稳定性。采用原位漫反射红外光谱（DRIFTS）技术，通过对Pt@TiOx/TiO 2催化剂的铂态、烃吸附行为和催化性能的监测，研究了硫酸盐对汽车尾气净化催化剂性能的影响。研究表明，硫酸盐通过异裂C-H键活化Pt delta+-（SO 4）（delta-）对来促进C3 H8燃烧，而硫酸化催化剂上的C3 H6燃烧由于抑制O-2活化而不利于燃烧。
Developing platinum catalysts highly active for hydrocarbon combustion at low temperatures is crucial but yet challenging, since platinum may convert into inert PtOx in oxidizing atmospheres and deactivates during catalytic combustion. In this article, a Pt@TiOx/TiO2 catalyst with platinum nanoparticles decorated by amorphous TiOx overlayers was synthesized via a strong metal-support interaction (SMSI)-related strategy. The Pt-TiOx electronic interaction stabilized reactive Pt-0 sites during reactions, resulting in outstanding activities and high stability for C3H8 and C3H6 combustion. The influences of sulfates-common byproducts forming on catalysts applied for automobile exhaust purification-were studied by monitoring the platinum states, the hydrocarbon adsorption behavior, and the catalytic performance of sulfated Pt@TiOx/TiO2 with in situ DRIFTS. It is suggested that the sulfates promoted C3H8 combustion via heterolytic C-H bond activation on Pt delta+-(SO4)(delta-) couples, while C3H6 combustion was disfavored on the sulfated catalyst because of inhibited O-2 activation.