Thermochemical Capture of Carbon Dioxide on Lithium Aluminates (LiAlO2 and Li5AlO4): A New Option for the CO2 Absorption
Thermochemical Capture of Carbon Dioxide on Lithium Aluminates (LiAlO2 and Li5AlO4): A New Option for the CO2 Absorption
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DOI：
10.1021/jp902501v
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发表时间：
2009-06-25
影响因子：
2.9
通讯作者：
Pfeiffer, Heriberto
中科院分区：
文献类型：
--
作者：
Avalos-Rendon, Tatiana;Casa-Madrid, Julio;Pfeiffer, Heriberto
铝酸锂（LiAlO 2和Li 5AlO 4）的合成，表征，并测试作为可能的CO2捕获剂。LiAlO_2对CO_2的吸收性能不佳。相反，Li 5AlO 4表现出优异的性能作为一个可能的CO2捕获剂。对Li 5AlO 4在CO2气氛下进行了不同温度下的动态热分析和等温热分析。这些结果清楚地表明，Li 5AlO 4能够在宽温度范围（200-700 ℃）内吸收CO2。然而，一个重要的烧结效果，观察到在样品的热处理过程中，在低温下的CO2吸收过程中产生的非典型行为。然而，在高温下，一旦锂扩散被激活，烧结效应不会干扰CO2吸收。Eyring模型用于确定CO2吸收（15.6 kJ/mol）和锂扩散（52.1 kJ/mol）的活化能谱，后者是限制过程。
Lithium aluminates (LiAlO2 and Li5AlO4) were synthesized, characterized, and tested as possible CO2 captors. LiAlO2 did not seem to have good qualities for the CO2 absorption. On the contrary, Li5AlO4 showed excellent behavior as a possible CO2 captor. Li5AlO4 was thermally analyzed under a CO2 flux dynamically and isothermically at different temperatures. These results clearly showed that Li5AlO4 is able to absorb CO2 in a wide temperature range (200-700 degrees C). Nevertheless, an important sintering effect was observed during the thermal treatment of the samples, which produced an atypical behavior during the CO2 absorption at low temperatures. However, at high temperatures, once the lithium diffusion is activated, the sintering effect did not interfere with the CO2 absorption. Eyring's model was used to determine the activation enthalpies of the CO2 absorption (15.6 kJ/mol) and lithium diffusion (52.1 kJ/mol); the last one is the limiting process.