Abstract Na2CO3/γ-Al2O3 is one of the most promising sorbents to capture CO2 from industrial flue gas streams due to its high efficiency in low-temperature and low cost. The textural properties of the γ-Al2O3 support, such as specific surface area and pore volume play key roles in performance of the sorbent. Therefore, the aim of this study was to improve the sorbent performance, using several γ-Al2O3 supports, prepared through a modified sol-gel process in the presence of polyethylene glycol (PEG). N2 adsorption-desorption analysis showed that the pore volume and specific surface area of the sample with the PEG/Al(OPri)3 mole ratio of 0.05 were, respectively, about 340 % and 38 % higher than the sample synthesized in the absence of PEG. In addition, improving the specific surface area and pore volume of γ-Al2O3 enhanced the total CO2 capture capacity of a Na2CO3/γ-Al2O3 sorbent by 34 %. Moreover, the effect of Na2CO3 loading on the best γ-Al2O3 sample was investigated, and the optimum loading of Na2CO3 and the corresponding total CO2 capture capacity were observed to be 50 wt.% and 131.6 mg CO2/gsorbent, respectively. Finally, the regeneration conditions of the sodium-based sorbent were determined using chemical kinetic study and temperature programmed desorption (TPD) analysis.

中文翻译：

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γ-Al2O3载体结构特性对Na2CO3捕集CO2能力影响的研究

摘要 Na2CO3/γ-Al2O3具有低温高效、成本低等优点，是从工业烟气中捕集CO2的最有前景的吸附剂之一。γ-Al2O3 载体的结构特性，如比表面积和孔体积，对吸附剂的性能起着关键作用。因此，本研究的目的是提高吸附剂性能，使用几种 γ-Al2O3 载体，在聚乙二醇 (PEG) 存在下通过改进的溶胶-凝胶工艺制备。N2吸附-解吸分析表明，PEG/Al(OPri)3摩尔比为0.05的样品的孔容和比表面积分别比没有PEG合成的样品高约340%和38% . 此外，提高 γ-Al2O3 的比表面积和孔体积使 Na2CO3/γ-Al2O3 吸附剂的总 CO2 捕获能力提高了 34%。此外，研究了 Na2CO3 负载量对最佳 γ-Al2O3 样品的影响，观察到 Na2CO3 的最佳负载量和相应的总 CO2 捕获能力分别为 50 wt.% 和 131.6 mg CO2/gsorbent。最后，使用化学动力学研究和程序升温脱附 (TPD) 分析确定钠基吸附剂的再生条件。