K和Ca掺杂对硅酸锂高温吸收CO2性能的影响

摘要

以SiO2和Li2CO3,为反应原料,采用高温固相法,在掺杂不同比例的K或Ca元素的条件下合成了一系列可以直接吸收CO2的硅酸锂(Li4SiO4)材料.实验结果表明,掺杂K或Ca元素都可以提高(Li4SiO4)材料对CO2的吸附率,但K和Ca的最佳掺杂量不同.不同元素掺杂对Li4SiO4吸附稳定性的影响也有不同.采用x射线衍射(XRD)初步探讨了不同元素掺杂对Li4SiO4的吸附性能影响原因.%Using SiO2, Li2CO3, and K2CO3 or CaCO3 as the starting materials, lithium silicate (Li4SiO4) absorbents doping varying contents d potassium or calcium were prepared by high-temperature solid-state reaction. The effect of doping potassium or calcium on the absorption performances and stability of Li4SiO4 were investigated, and the experimental results showed that doping potassium or calcium could improve the CO2 absorption ability of Li4SiO4. However, the optimal doping dose of potassium is different from that of calcium, and the effect of potassium on absorption stability is also different from that of calcium. The different effects of different dopers on absorption ability of Li4SiO4 were primarily investigated by X-ray Diffraction (XRD) analysis.