Novel synthesis of tailored Li4SiO4-based microspheres for ultrafast CO2 adsorption

It has been widely acknowledged that the Li4SiO4-based adsorbents with smaller particle size and tailored structure will certainly exhibit superior CO2 capture performance. In this work, a novel two-phase synthesis method was proposed to produce tailored micro-scale Li4SiO4-based adsorbents with ultrafast CO2 capture rate. The effects of synthetic temperature on the phase compositions, the chemical bonds, the pore structure, the surface morphology and the CO2 capture performance of obtained adsorbents were systematically investigated. It is found that the increase of temperature during synthesis process could promote the Li4SiO4 content of obtained adsorbents. Nevertheless, higher temperature also leads to the aggravation and sintering of particles, thus hindering the capacity of adsorbents. Examining the pros and cons, the adsorbent calcined at 600 degrees C shows the greatest morphology consisted of hollow-structured microspheres with a uniform diameter of 1-2 mu m and exhibits the fastest adsorption rate as well as the highest adsorption capacity (similar to 0.184 g CO2/g adsorbent within only 5 min's adsorption under 15 vol% CO2), leading to a superior Li4SiO4 conversion as high as similar to 80%. In a word, this two-phase method is promising in the future production of Li4SiO4-based microspheres for high-efficient and ultrafast CO2 capture.

Automated summary

It has been widely acknowledged that Li4SiO4-based adsorbents with smaller particle size and tailored structure will exhibit superior CO2 capture performance. This study proposed a novel two-phase synthesis method to produce micro-scale Li4SiO4-based adsorbents with ultrafast CO2 capture rate. Experimental results showed that the adsorbent calcined at 600 degrees C exhibited the best morphology, with hollow-structured microspheres with a uniform diameter of 1-2 μm, showing the fastest adsorption rate and highest adsorption capacity.