Jia Liu, Zhen Wang, Zirui Wang
2019
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Abstract
Sodium Orthosilicate was synthesized by a wet chemical method and the further calcination at 600 °C. The mixtures of Na4SiO4 and alkali (Li/Na/K) carbonates were prepared by a mechanically mixing method. The CO2 capture performance of the samples was characterized by dynamic thermogravimetric analyses, in situ XRD and Raman spectroscopy in an atmosphere of 80 vol% CO2 mixed with 20 vol% N2. It was found that sodium orthosilicate can be used for CO2 sorption, and its maximum capacity can reach up to 19.2 wt%. The addition of alkali carbonates, which serve as the promoters, leads to the enhancement of CO2 capture performance of Na4SiO4, especially in low temperatures, because of the formation of C2O52-. The existence of C2O52- in the mixture exposed in the 80 vol% CO2 was confirmed by the in situ Raman spectra, and it geometric structure was presented by DFT calculations. The formation of C2O52- within the carbonates has the positive influence on CO2 capture at low temperature, and enhancement of CO2 diffusion by Grotthuss_like transport through the carbonate product shell at high temperature beside the formation of eutectic carbonate melts.