CO2 recycling by reaction with renewably-generated hydrogen |
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| Authors: | S Kent Hoekman Amber Broch Curtis Robbins Richard Purcell |
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| Institution: | 1. Department of Environmental Science and Technology, Tokyo Institute of Technology, Yokohama, Kanagawa 226-8503, Japan;2. Solutions Research Laboratory, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;3. Division of Energy Science, Luleå University of Technology, 971 87 Luleå, Sweden;4. Department of Chemical Engineering, Institut Teknologi Bandung, Bandung 40132, Indonesia;5. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China;1. Earth and Environmental Engineering Department, Columbia University in the City of New York, 500 W 120th Street, New York, NY, 10027, United States;2. Chemical Engineering Department, Columbia University in the City of New York, 500W 120th Street, New York, NY, 10027, United States |
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| Abstract: | A laboratory-scale reactor system was built and operated to demonstrate the feasibility of catalytically reacting carbon dioxide (CO2) with renewably-generated hydrogen (H2) to produce methane (CH4) according to the Sabatier reaction: CO2 + 4H2 → CH4 + 2H2O. A cylindrical reaction vessel packed with a commercial methanation catalyst (Haldor Topsøe PK-7R) was used. Renewable H2 produced by electrolysis of water (from solar- and wind-generated electricity) was fed into the reactor along with a custom blend of 2% CO2 in N2, meant to represent a synthetic exhaust mixture. Reaction conditions of temperature, flow rates, and gas mixing ratios were varied to determine optimum performance. The extent of reaction was monitored by real-time measurement of CO2 and CH4. Maximum conversion of CO2 occurred at 300–350 °C. Approximately 60% conversion of CO2 was realized at a space velocity of about 10,000 h?1 with a molar ratio of H2/CO2 of 4/1. Somewhat higher total CO2 conversion was possible by increasing the H2/CO2 ratio, but the most efficient use of available H2 occurs at a lower H2/CO2 ratio. |
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