The inhibition mechanism of H2O at hydrothermal aging over Pt/SiO2-Al2O3 for NO oxidation

Ding, Xinmei; Liu, Zhimin; Liang, Yanli; He, Darong; Pan, Yao; Lai, Xiaoming; Zhao, Ming; Wang, Jianli; Chen, Yaoqiang

doi:10.1016/j.jece.2021.105497

Cited by 6 publications

(2 citation statements)

References 51 publications

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“…The loss of NO oxidation activity over the downstream PtPd stage is expected and consistent with reports of water inhibition on Pt sites. [27][28][29] We also confirmed in Figure 4 d that the presence of propylene as model hydrocarbon does not compromise or inhibit the low temperature CO oxidation activity of the PdCu alloy. Interestingly, the onsets of the TPO profiles for NO and propylene coincide and occur after CO has been almost completely consumed.…”

Section: Resultssupporting

confidence: 62%

PdCu Alloy Catalyst for Inhibition‐free, Low‐temperature CO Oxidation

Song,

Svadlenak,

Bathena

et al. 2023

ChemCatChem

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Designing robust catalysts for low‐temperature oxidation is pertinent to the development of advanced combustion engines to meet increasingly stringent emissions limitations. Oxidation of CO, hydrocarbon and NO pollutants over platinum‐group catalysts suffer from strong inhibition due to their competitive adsorption, while coinage metals are generally slow at activating O2. Through computational screening we discovered a PdCu alloy catalyst that completely oxidizes CO below 150 °C without inhibition by NO, propylene or water. This is attributed primarily to geometric effects and the presence of CO bound to Pd sites within the Cu‐rich surface of the PdCu alloy. We demonstrate that the novel PdCu catalyst can be used in tandem with a PtPd catalyst to achieve sequential, inhibition‐free, complete oxidation of CO in a two‐bed system, while also achieving 50% NO conversion below 120 °C. Moreover, neither water nor propylene adversely affect the low temperature CO oxidation activity.

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