Effect of MgO/Al2O3 ratio in the support of mesoporous Ni/MgO–Al2O3 catalysts for CO2 utilization via reverse water gas shift reaction |
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| Affiliation: | 1. Chemical Engineering Department, Faculty of Engineering, University of Isfahan, Isfahan, Iran;2. Hydrogen and Fuel Cell Research Laboratory, Department of Chemical Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran;1. Faculty of Mechanical Engineering & Technology, Universiti Malaysia Perlis, Pauh Putra Campus, 02600 Arau, Perlis, Malaysia;2. Thermofluids & Energy Research Group, Universiti Malaysia Perlis, Pauh Putra Campus, 02600 Arau, Perlis, Malaysia;3. Institute of Engineering Mathematic, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia;4. Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Johor, Malaysia;5. Centre of Excellent Unmanned Aerial Systems (COEUAS), Universiti Malaysia Perlis, 01000 Kangar, Perlis, Malaysia;6. School of Engineering, Monash University of Malaysia, 47500 Subang Jaya, Selangor, Malaysia;1. Institute of Engineering Innovation, School of Engineering the University of Tokyo, 2-11-16, Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan;2. Institute of Industrial Science, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153-8505, Japan;3. Department of Systems and Control Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152-8550, Japan;4. Department of Mechanical Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, 152-8550 Tokyo, Japan |
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| Abstract: | 2 and 5 wt.% nickel was supported on different MgO to Al2O3 (M/A) ratios (0.5, 1 and 1.5) and evaluated in reverse water gas shift (RWGS) reaction. The catalysts were prepared by impregnation method and the nanocrystalline supports were synthesized by simple surfactant (CTAB) assisted precipitation technique. The following catalytic activity was observed for 2% & 5% Ni supported on different M/A ratios; M/A = 1 > M/A = 1.5 > M/A = 0.5. The perceived order was related to difference in the structural properties of supports and catalysts. The BET results revealed decrease of specific surface area with increase in M/A ratio, mesoporous structure for M/A = 0.5 and 1 and meso-macroporous structure for M/A = 1.5. The effect of nickel loading on the support with M/A = 1 was also investigated. 1.5% Ni showed high CO2 conversion of 39.2% at 700 °C and CO selectivity higher than 90% at all temperatures. Increase of nickel loading higher than 1.5% was in favor of CH4 formation. The TEM images of 1.5% Ni on M/A = 1 revealed uniform distribution of Ni particles with average size of 4.9 nm. The H2-TPR analysis displayed shifting of maximum temperature of the main peak (γ) to higher temperatures with increase of M/A ratio in the support, indicating harder reducibility of catalysts with higher MgO content. The 1.5% Ni supported on M/A = 1 (MgAl2O4) showed great catalytic stability and CO selectivity (>98%) after 15 h on stream. |
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| Keywords: | Nanocrystalline powders Nickel catalyst RWGS |
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