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Open AccessArticle

Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment

Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Korea
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Catalysts 2019, 9(10), 838; https://doi.org/10.3390/catal9100838
Received: 20 September 2019 / Revised: 3 October 2019 / Accepted: 8 October 2019 / Published: 10 October 2019
(This article belongs to the Section Environmental Catalysis)
The improvement of methane combustion activity was observed in cyclic temperature-programed and isothermal reactions over Pd/ZrO2 catalysts by simple reduction/reoxidation treatment. The catalytic activity increased during the initial stages of isothermal reaction, and the light-off temperature was lowered as the number of cycles increased in the cyclic temperature-programed reaction. To reveal the origin of activation, variations in the reduction properties after the activation period were carefully investigated through CH4 temperature-programed reduction (TPR) measurements. From the CH4-TPR results, it was confirmed that the reduction temperature decreased significantly after activation. The observation of the CH4-TPR peak at relatively low temperatures is directly proportional to the catalytic activity of CH4 combustion. It was therefore concluded that repeated reduction/reoxidation occurred in the reactant stream, and this phenomenon allowed the combustion reaction to proceed more easily at lower temperatures. View Full-Text
Keywords: CH4 temperature-programed reduction; methane combustion; Pd/ZrO2 catalyst; reduction; calcination CH4 temperature-programed reduction; methane combustion; Pd/ZrO2 catalyst; reduction; calcination
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MDPI and ACS Style

Kim, C.; Hong, E.; Shin, C.-H. Improvement of Methane Combustion Activity for Pd/ZrO2 Catalyst by Simple Reduction/Reoxidation Treatment. Catalysts 2019, 9, 838.

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