Enhanced multi-cycle CO2 capture and tar reforming via a hybrid CaO-based absorbent/catalyst: Effects of preparation,reaction conditions and application for hydrogen production |
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| Affiliation: | 1. Department of Building Environment and Thermal Engineering, School of Environment and Energy Engineering, Anhui Jianzhu University, Ziyun Rd. 292, Hefei 230601, China;2. Institute of Energy and Power Engineering, College of Mechanical Engineering, Zhejiang University of Technology, Chaowang Rd.18, Hangzhou 310014, China;3. Quzhou Eco-Industrial Innovation Institute ZJUT, East Rongchang Rd. 2, Quzhou 324499, China;4. Zhejiang Cosinsolar CSP Technology Research Institute Co., Ltd, Qufu Rd.1188, Huzhou 313000, China;5. Zhejiang Carbon Neutral Innovation Institute, Zhejiang University of Technology, Chaowang Rd.18, Hangzhou 310014, China |
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| Abstract: | A hybrid CaO-based absorbent/catalyst (Ca–Al–Fe) for calcium looping gasification (CLG) is prepared by a two-step sol-gel method. The effects of preparation and “carbonation-calcination” conditions on cyclic carbonation performance of Ca–Al–Fe are investigated. Calcination temperature of 900 °C and calcination time of 4 h are suitable parameters for absorbent preparation. The CaO conversion of Ca–Al–Fe increases with increasing carbonation temperature below 750 °C. Under severe calcination conditions such as high temperature, high CO2 concentration and long-term up to 40 cycles, Ca–Al–Fe still shows good cyclic CO2 capture reactivity. Moreover, the effect of Ca–Al–Fe on tar removal enhancement is investigated in comparison with three candidate absorbents (Ca、Ca–Fe and Ca–Al). During five toluene reforming cycles, Ca–Al–Fe presents the highest average H2 yield and the least deposited coke with an average hydrogen concentration of about 68.8%. The average toluene conversion with Ca–Al–Fe is about 26.41% higher than that using conventional CaO. |
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| Keywords: | Calcium looping Biomass tar reforming Hydrogen production |
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