The zirconate-silicate hybrid as CO₂ capture sorbent at high temperature were decomposed from ZrSiO₄ by NaOH and KOH. The chemical structure and CO₂ adsorption/desorption dynamics of zirconate-silicate hybrid were studied by the Fourier transform infrared, X-ray photoelectron spectroscopy and the thermogravimetric measurements. The results show that alkali divides ZrSiO₄ into ZrO₂ and Si-OH groups, then Si-OH groups diffuse into molten alkali and condensate to form a silicate shell with CO₂ capture capacity on the surface of alkali activation products. The electron-donating ability of the molten alkali determines the chemical structure and the CO₂ storage capacity of sorbents. When the ratio of NaOH to ZrSiO₄ is 6:1, the sorbent with the optimal chemical structure for CO₂ capture can be acquired after the alkali activation reaction. The CO₂ capture process is kinetically controlled by metal cation diffusion after the carbonate-oxide external shell is formed, and the diffusion process is more dependent on the chemical structure of silicates in the zirconate-silicate hybrid than CO₂ direct chemisorption reaction.

在高温下作为 CO ₂捕获吸附剂的锆酸盐-硅酸盐杂化物被 NaOH 和 KOH从 ZrSiO ₄分解。通过傅里叶变换红外光谱、X射线光电子能谱和热重测量研究了锆酸盐-硅酸盐杂化物的化学结构和CO ₂吸附/解吸动力学。结果表明，碱将ZrSiO ₄分解为ZrO ₂和Si-OH基团，然后Si-OH基团扩散到熔融碱中并冷凝，在碱活化产物表面形成具有CO ₂捕获能力的硅酸盐壳。熔融碱的给电子能力决定了化学结构和CO ₂吸附剂的储存容量。当NaOH与ZrSiO ₄的比例为6:1时，碱活化反应后可以获得具有最佳CO ₂捕集化学结构的吸附剂。CO ₂捕获过程在碳酸盐-氧化物外壳形成后由金属阳离子扩散动力学控制，扩散过程比CO ₂直接化学吸附反应更依赖于锆酸盐-硅酸盐杂化物中硅酸盐的化学结构。