Reproducibility of Lithium Silicate Pellets in N2 Atmosphere

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A lithium silicate (Li4SiO4) absorbent has been developed as a new CO2 absorbent at high temperatures, which emits CO2 at temperatures above 993 K in pure CO2 at 101 kPa. This temperature is approximately 200 K lower than that for well-known CaO. It was used in CH4 steam reforming experiments and higher CH4 conversion was observed for a mixture of a catalyst and an Li4SiO4 pellet, than for a catalyst alone, at around 873 K. In this study, the emission temperature and reproducibility of an Li4SiO4 pellet (5 mm, spherical) in N2 was examined from the viewpoint of building a high-efficiency H2 production system, since the CO2 emission temperature is lower than that in pure CO2. The pellet completely emitted CO2 within 1 h at 873 K, and within 0.5 h at 923 K, and showed high reproducibility, exhibiting almost the same absorption property for 5 cycles.

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