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Processes 2019, 7(3), 141; https://doi.org/10.3390/pr7030141

Highly Selective Syngas/H2 Production via Partial Oxidation of CH4 Using (Ni, Co and Ni–Co)/ZrO2–Al2O3 Catalysts: Influence of Calcination Temperature

1
Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
2
Chemical Engineering Department, SABIC Polymer Research Center, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
3
Leibniz Institute for Catalysis, 18055 Rostock, Germany
*
Authors to whom correspondence should be addressed.
Received: 7 February 2019 / Revised: 28 February 2019 / Accepted: 28 February 2019 / Published: 6 March 2019
(This article belongs to the Special Issue Metal Nanoparticles as Catalysts for Green Applications)
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Abstract

In this study, Ni, Co and Ni–Co catalysts supported on binary oxide ZrO2–Al2O3 were synthesized by sol-gel method and characterized by means of various analytical techniques such as XRD, BET, TPR, TPD, TGA, SEM, and TEM. This catalytic system was then tested for syngas respective H2 production via partial oxidation of methane at 700 °C and 800 °C. The influence of calcination temperatures was studied and their impact on catalytic activity and stability was evaluated. It was observed that increasing the calcination temperature from 550 °C to 800 °C and addition of ZrO2 to Al2O3 enhances Ni metal-support interaction. This increases the catalytic activity and sintering resistance. Furthermore, ZrO2 provides higher oxygen storage capacity and stronger Lewis basicity which contributed to coke suppression, eventually leading to a more stable catalyst. It was also observed that, contrary to bimetallic catalysts, monometallic catalysts exhibit higher activity with higher calcination temperature. At the same time, Co and Ni–Co-based catalysts exhibit higher activity than Ni-based catalysts which was not expected. The Co-based catalyst calcined at 800 °C demonstrated excellent stability over 24 h on stream. In general, all catalysts demonstrated high CH4 conversion and exceptionally high selectivity to H2 (~98%) at 700 °C. View Full-Text
Keywords: Al2O3; bimetallic catalyst; syngas; methane; partial oxidation; ZrO2 Al2O3; bimetallic catalyst; syngas; methane; partial oxidation; ZrO2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hamza Fakeeha, A.; Arafat, Y.; Aidid Ibrahim, A.; Shaikh, H.; Atia, H.; Elhag Abasaeed, A.; Armbruster, U.; Sadeq Al-Fatesh, A. Highly Selective Syngas/H2 Production via Partial Oxidation of CH4 Using (Ni, Co and Ni–Co)/ZrO2–Al2O3 Catalysts: Influence of Calcination Temperature. Processes 2019, 7, 141.

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