Abstract
Dynamics of the methane pyrolysis on the ZrO2/SiC resistive catalyst was studied at various temperatures. At a temperature of 1300C, the conversion of methane passes through a maximum (55%) at the 60th minute, with the selectivity with respect to acetylene monotonically increasing during the whole experiment. The method of scanning electron microscopy with EDAX analysis demonstrated that, during the first 10 min of an experiment, the ZrO2/SiC is nearly fully carbonized at a temperature of 1300C. Also, a layered carbon coating is formed on the catalyst surface in the course of the experiment, with C2 hydrocarbons still present in pyrolysis products. It was shown that the carbon deposits formed on the catalyst surface are catalytically active in the process of acetylene formation. Regeneration of the catalyst does not fully restore its catalytic properties.
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Funding
The study was carried out under the State assignment to the Center of new chemical technologies, Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, in conformity with the Program of basic research by State academies of sciences for the years of 2013–2020, direction V. 46, project V.46.2.5 (number of state registration in the Integrated State Record-keeping System of R&D and Technological activities for civil purposes, AAAA-A17-117021450096-8).
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The authors state that they have no conflict of interest to be disclosed in the present communication.
Russian Text © The Author(s), 2019, published in Zhurnal Prikladnoi Khimii, 2019, Vol. 92, No. 9, pp. 1179–1187.
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Sigaeva, S.S., Shlyapin, D.A., Temerev, V.L. et al. Pyrolysis of Methane on a Resistive ZrO2/SiC Catalyst. Russ J Appl Chem 92, 1258–1265 (2019). https://doi.org/10.1134/S1070427219090118
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DOI: https://doi.org/10.1134/S1070427219090118