The Li₄SiO₄ sorbent experience deactivation caused by sintering of the sorbent and a slow sorption rate for CO₂ capture at high temperatures. In this study, a novel Li₄SiO₄-based sorbent containing Li₂SiO₃ and LiAlO₂ was developed to overcome the disadvantages of the Li₄SiO₄ sorbent for CO₂ capture in the high temperature range of 550–700 °C. The regenerable Li₄SiO₄-based sorbent, which was prepared by physical mixing of Li₂CO₃ and SiO₂ in a 2:1 M ratio with 10 wt% Al₂O₃, virtually maintained its CO₂ capture capacity during multiple tests at a regeneration temperature of 700 °C. This is because well-dispersed Li₂SiO₃ and LiAlO₂ play an important role in the cyclic stability of the Li₄SiO₄-based sorbent, as they prevent its sintering during multiple cycles. In addition, we found that LiAlO₂ directly contributes to the formation of Li₂SiO₃, which results from a decrease in the molar ratio of Li₂CO₃ to SiO₂ upon reaction of Li₂CO₃ with γ-alumina.

Li ₄ SiO ₄吸附剂由于烧结而失活，并且在高温下捕获CO _2的吸附速率慢。在这项研究中，开发了一种新型的包含Li ₂ SiO ₃和LiAlO _2的基于Li ₄ SiO ₄的吸附剂，以克服Li ₄ SiO ₄吸附剂在550–700°C的高温范围内捕获CO ₂的缺点。通过将Li ₂ CO ₃和SiO ₂物理混合制备可再生的基于Li ₄ SiO ₄的吸附剂以2：1 M的比例和10 wt％的Al ₂ O ₃，在700°C的再生温度下进行多次测试时，实际上保持了其CO ₂捕获能力。这是因为充分分散的Li ₂ SiO ₃和LiAlO ₂在基于Li ₄ SiO ₄的吸附剂的循环稳定性中起着重要作用，因为它们阻止了其在多个循环中的烧结。此外，我们发现LiAlO ₂直接有助于Li ₂ SiO ₃的形成，这是由于Li ₂ CO ₃与SiO ₂的摩尔比降低所致。Li ₂ CO ₃与γ-氧化铝反应后的反应。