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

Abstract

High light-off temperature and poor water-tolerance at low temperature are the mains 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 up a tight Pd-NiCo2O4 interface. As 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 obtained catalyst by galvanic displacement has more Pd4+ and more 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 dissociation of C-H bond in methane. Thus, this catalyst displays outstanding catalytic activity with T90 = 260 °C and excellent water-tolerance below 300 °C. In addition, a simple model was based on obtained results to understand catalytic mechanism and give a universal strategy for rational designing catalyst for low temperature complete oxidation of methane in the future.

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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, Accepted Manuscript

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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, Accepted Manuscript , DOI: 10.1039/C9CY01766F

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