Impregnation Precipitation Preparation and Kinetic Analysis of Li4SiO4-Based Sorbents with Fast CO2 Adsorption Rate

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• 作者：ShaoYun Shan ; SanMei Li ; QingMing Jia ; LiHong Jiang ; YaMing Wang ; JinHui Peng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：May 29, 2013
• 年：2013
• 卷：52
• 期：21
• 页码：6941-6945
• 全文大小：273K
• 年卷期：v.52,no.21(May 29, 2013)
• ISSN：1520-5045

文摘

Li₄SiO₄-based sorbents from diatomite with fast CO₂ adsorption rate (achieving the adsorption equilibrium at about 15 min) were developed by the impregnation precipitation method at lower temperature (600 掳C). Influence of sintering temperatures on phase composition was investigated. Phase composition and morphologies were analyzed by XRD and SEM, and CO₂ adsorption properties were investigated by TG. The as-prepared Li₄SiO₄-based sorbents reached a higher adsorption capacity of 34.02 wt % (7.73 mmol CO₂/g Li₄SiO₄, corresponding to 92.70% efficiency) in a mixture gas (50 mL/min N₂ and 50 mL/min CO₂). The activation energies for chemisorption (28.868 kJ/mol) and diffusion (16.563 kJ/mol) were obtained by isothermal study. Compared with our previous research results by the solid reaction method, the activation energies for these two processes decreased measurably. In addition, the as-prepared Li₄SiO₄-based sorbents also exhibited faster adsorption rate and better adsorption鈥揹esorption performance.