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Issue 22, 2019
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Ultrafine PdOx nanoparticles on spinel oxides by galvanic displacement for catalytic combustion of methane

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Abstract

High light-off temperature and poor water-tolerance at low temperature are the main drawbacks of catalysts for catalytic methane combustion. Herein, the galvanic displacement method was adopted to obtain ultrafine PdOx nanoparticles (∼1 nm) on NiCo2O4 and build a tight Pd–NiCo2O4 interface. As a comparison, additional reference samples were prepared by conventional synthetic methods. The synthesized catalysts were characterized by XRD, TEM, XPS, H2-TPR, CH4-TPR, CO2-TPD and in situ DRIFT techniques. It is found that the catalyst obtained by galvanic displacement has more Pd4+ and oxygen vacancies. The high oxidation state of Pd is more conducive to the activation of methane, and a large number of oxygen vacancies can promote the catalytic reaction rate. Thus, this catalyst displays outstanding catalytic activity with T90 = 260 °C and excellent water-tolerance below 300 °C. In addition, a simple model was built based on the obtained results to understand the catalytic mechanism and provide a universal strategy for rational design of catalysts for low temperature complete oxidation of methane.

Graphical abstract: Ultrafine PdOx nanoparticles on spinel oxides by galvanic displacement for catalytic combustion of methane

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Publication details

The article was received on 02 Sep 2019, accepted on 05 Oct 2019 and first published on 07 Oct 2019


Article type: Paper
DOI: 10.1039/C9CY01766F
Catal. Sci. Technol., 2019,9, 6404-6414

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    Ultrafine PdOx nanoparticles on spinel oxides by galvanic displacement for catalytic combustion of methane

    Z. Zhang, X. Hu, Y. Zhang, L. Sun, H. Tian and X. Yang, Catal. Sci. Technol., 2019, 9, 6404
    DOI: 10.1039/C9CY01766F

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