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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received July 12, 2019
Accepted November 3, 2019

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Efficient removal of the carbon deposits formed during the mixed methane reforming over Ni/Al2O3

Oleksandr Shtyka^† Mateusz Zakrzewski Radoslaw Ciesielski Adam Kedziora Sergey Dubkov¹ Roman Ryazanov² Malgorzata Szynkowska Tomasz Maniecki

Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116 90-924 Lodz, Poland ¹National Research University of Electronic Technology, Institute of Advanced Materials and Technologies, Shokin Square 1 124498, Zelenograd, Moscow, Russia, Russian Federation ²Scientific-Manufacturing Complex, “Technological Centre”, 1-7 Shokin Square, 124498, Zelenograd, Moscow, Russia, Russian Federation

Korean Journal of Chemical Engineering, February 2020, 37(2), 209-215(7), 10.1007/s11814-019-0419-3

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Abstract

This work investigates the process of elimination of carbon deposits formed during the mixed reforming of methane mixture. The mixed reforming of methane to synthesis gas was studied over Ni/Al2O3 catalyst in the 650-750 °C. The amount of carbon deposit on the surface of catalyst varied from 2.8 to 5.9%, depending on the reaction temperature. The reactivity of carbon species was evaluated in the oxygen, hydrogen, carbon dioxide, and water mixtures. The obtained results revealed the presence of highly active carbon form (etched at a temperature below 200 °C) and inactive form (gasification at a temperature above 500 °C). The SEM and Raman analyses confirmed the presence of carbon in the form of filaments. Among all investigated gasification agents, water vapor was found to be the most efficient in removing the carbon deposit due to better adsorption of water on the surface of aluminum oxide. The overall mechanism of mixed methane reforming along with carbon gasification was shown.

Keywords

Methane Reforming Carbon Deposit Nickel Catalyst Gasification Reaction Mechanism

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