CO2 Desorption Kinetics for Immobilized Polyethylenimine (PEI)

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• 作者：Esmail R. Monazam ; James Spenik ; Lawrence J. Shadle
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：January 16, 2014
• 年：2014
• 卷：28
• 期：1
• 页码：650-656
• 全文大小：336K
• ISSN：1520-5029

文摘

The CO₂ desorption rate from CO₂-loaded immobilized polyethylenimine (PEI) on mesoporous silica was investigated in a fluidized bed unit. Nonisothermal studies were carried in the temperature range of 340鈥?80 K and different heating rate (1.0鈥?.7 K/min). The tests were performed using two different inlet CO₂ concentrations, mainly 16.5% and 33%. The kinetics involved in CO₂ desorption was studied by applying various analytical techniques (model-free and model-fitting) to the nonisothermal data. The model-free approach represented by the nonisothermal isoconversional methods revealed that the apparent Arrhenius parameters (A and E_a) increased with extent of conversion for 0 鈮?X 鈮?0.3, followed by an approximately nearly constant value at the higher CO₂ desorption levels. In the constant-E_a region, the nonisothermal CO₂ desorption follows a two-dimensional diffusion model. The apparent Arrhenius parameters (ln A and E_a) evaluated were 71.3 卤 3.6 and 230.5 卤 13.0 kJ/mol, respectively.