Lowering risk of methanation of carbon support in Ru/carbon catalysts for CO methanation by adding lanthanum |
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| Affiliation: | 1. Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland;2. West Pomeranian University of Technology Szczecin, Faculty of Chemical Technology and Engineering, Institute of Inorganic Chemical Technology and Environment Engineering, Pu?askiego 10, 70-322 Szczecin, Poland;1. Department of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Pu?askiego 10, 70-322 Szczecin, Poland;2. Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, al. Piastów 50a, 70-311 Szczecin, Poland;1. Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;2. Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;3. Institute of Hydrogen Economy, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;4. Department of Chemical Engineering, Faculty of Chemical Engineering, Universiti Teknologi Malaysia, 81310 UTM Johor Bahru, Johor, Malaysia;5. Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl Ganesha No 10, Bandung 40132, Indonesia;6. Department of Applied Chemistry, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan;1. Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis SB RAS, Omsk, 644040, Russia;2. Federal Research Center, Krasnoyarsk Science Centre SB RAS, Krasnoyarsk, 660036, Russia;3. Siberian Federal Uneversity, Krasnoyarsk, 660041, Russia;4. Institute of Chemistry and Chemical Technology, Krasnoyarsk Science Center SB RAS, Krasnoyarsk, 660036, Russia;5. Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva, 5, Novosibirsk 630090, Russia;1. Federal State Institute of Science of Hydrocarbon Processing SB RAS, Omsk 644040, Russian Federation;2. Omsk State Technical University, 11, Mira Pr., Omsk 644050, Russian Federation |
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| Abstract: | Two series of Ru/C catalysts doped with lanthanum ions are prepared and studied in CO methanation in the H2-rich gas. The samples are characterized by N2 physisorption, TG-MS studies, XRD, XPS, TEM/STEM and CO chemisorption. Two graphitized carbons differing in surface area (115 and 80.6 m2/g) are used as supports. The average sizes of ruthenium crystallites deposited on their surfaces are 4.33 and 5.95 nm, respectively. The addition of the proper amount of La to the Ru/carbon catalysts leads to an above 20% increase in the catalytic activity along with stable CH4 selectivity higher than 99% at all temperatures. Simultaneously, lanthanum acts as the inhibitor of methanation of the carbon support under conditions of high temperature and hydrogen atmosphere. Such positive effects are achieved at a very low concentration of La in the prepared samples, a maximum 0.04 La/Ru (molar ratio). 0.01 mmol La introduced to the Ru/C system leads to 98% CO conversion at 270 °C. |
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| Keywords: | Lanthanum promoter Ruthenium/carbon catalysts Graphitized carbon support CO methanation Clean hydrogen |
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