Effect of pre-treatment and calcination temperature on Al2O3-ZrO2 supported Ni-Co catalysts for dry reforming of methane |
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| Affiliation: | 1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia;2. School of Chemistry and Chemical Engineering, Queen''s University Belfast, Belfast, BT9 5AG, Northern Ireland, UK;3. Leibniz Institute for Catalysis, Albert-Einstein-Str. 29A, 18059, Rostock, Germany;1. Chemical Engineering Department, College of Engineering, King Saud University, P.O. Box 800, Riyadh, 11421, Saudi Arabia;2. Leibniz-Institut für Katalyse, Albert-Einstein-Strasse 29A, 18059, Rostock, Germany;3. School of Chemistry and Chemical Engineering, Queen''s University Belfast, Belfast BT9 5AG, Northern Ireland, UK;1. Faculty of Chemical & Natural Resources Engineering, Universiti Malaysia Pahang, Lebuhraya Tun Razak, 26300 Gambang, Kuantan, Pahang, Malaysia;2. Center for Advanced Materials Research, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam;3. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi, Aichi 441-8580, Japan;4. Nguyen Tat Thanh University, 300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Viet Nam;1. Chemical Engineering Department, College of Engineering, King Saud University, P.O Box 800, Riyadh 11421, Saudi Arabia;2. Energy and Resource Management Division, CSIR-National Environmental Engineering and Research Institute, Nagpur 440010, India;3. Leibniz Institute for Catalysis, Rostock, Germany;4. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11421, Saudi Arabia |
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| Abstract: | In this paper, the effect of pre-treatment and calcination temperature on a series of 5%Co/Al2O3-ZrO2, 5%Ni/Al2O3-ZrO2 and 2.5%Co-2.5%Ni/Al2O3-ZrO2 catalysts for dry reforming of methane was investigated. Main focus of our research was to improve the catalyst stability by proper pre-treatment and reaction conditions. The first approach aimed at the catalyst pre-treatment by using bimetallic systems and the second strategy at the in situ suppression of coke. The catalytic activity of bimetallic system was indeed higher compared to the monometallic in the temperature range of 500–800 °C (space velocity 18000 ml h?1·gcat?1, CH4/CO2 = 1). The bimetallic catalyst calcined at 800 °C showed highest CH4 conversion without deactivation and gave a H2/CO ratio of 91% and 0.96, respectively, and good stability with less coke deposition over 28 h at 800 °C reaction temperature. This improvement is assigned to the synergism between Co and Ni, their high dispersion according to interaction with support. It has been shown in our work that pretreatment temperatures and atmospheres have strong impact on stability of the catalyst. TEM, XRD and TPO investigations confirmed that the slight catalyst deactivation was related to the formation of multiwall carbon nanotubes with hollow inner tube structure. The addition of small amounts of steam or oxygen during DRM improved both the catalyst activity and stability as the bimetallic catalyst lost around 9.4% conversion in DRM, 5.4% in presence of water and only 3.2% in presence of O2. |
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| Keywords: | Bimetallic catalyst Dry reforming Methane Stability Deactivation Regeneration |
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