Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 39, Issue 31, Pages 17913-17920Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2014.07.011
Keywords
CO2 acceptors; Lithium orthosilicate; Potassium doping
Categories
Funding
- National Natural Science Foundation of China [21176080]
- Shanghai Rising-Star Program (B type) [13QB1401300]
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Potassium carbonate was used as a doping agent to improve the absorption properties of Li4SiO4 for CO2 capture during critical sorption-enhanced steam methane reforming (SESMR) under moderate temperature and low CO2 concentration with moisture. The mechanism of CO2 absorption onto pure and K-doped Li4SiO4 under various CO2 concentrations was experimentally and theoretically studied. At 575 degrees C, pure Li4SiO4 exhibited poor CO2 absorption capacity because of low CO2 diffusion through the solid Li2CO3 shell of the sorbent. By contrast, the K-doped Li4SiO4 sorbent showed excellent performance. K2CO3 and Li2CO3 can form eutectic compounds that facilitate the diffusion of CO2 into the sorbent crystals and enhance the absorption of CO2. The amount of doping agent was further optimized under different operating conditions and numerical analysis. Absorption-desorption cycles were performed under industrial operating conditions and the optimized K-doped Li4SiO4 exhibited satisfactory absorption capacity and stability. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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