Synthesis and evaluation as CO_2 chemisorbent of the Li_5(Al_(1-x)Fe_x)O_4 solid solution materials: Effect of oxygen addition
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摘要
Pentalithium aluminate(β-Li_5AlO_4) and the corresponding iron-containing solid solution(Li_5(Al_(1-x)Fe_x)O_4)were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, N_2 adsorption-desorption and temperature-programmed desorption of CO_2. Results showed that 30 mol% of iron can be incorporated into the β-Li_5AlO_4 crystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li_5(Al_(1-x)Fe_x)O_4 samples chemisorbed CO_2 between 200 and 700 °C, where the superficial chemisorption presented the highest enhancement,in comparison to β-Li_5AlO _4. Additionally, Li_5(Al_(1-x)Fe_x)O_4 samples sintered at higher temperatures thanβ-Li_5AlO_4. Isothermal CO_2 chemisorption experiments of β-Li_5AlO_4 and Li_5(Al_(1-x)Fe_x)O_4 were fitted to a first order reaction model, corroborating that iron enhances the CO_2 chemisorption, kinetically. When oxygen was added to the gas flow, CO_2 chemisorption process was mainly enhanced between 400 and 600 °C for the Li_5(Al_(0.8)Fe_(0.2))O_4 sample in comparison to β-Li_5AlO_4. Hence, Li_5(Al_(1-x)Fe_x)O_4 solid solution presented an enhanced CO_2 chemisorption process, in the presence and absence of oxygen, in comparison to β-Li_5AlO_4.
Pentalithium aluminate(β-Li_5AlO_4) and the corresponding iron-containing solid solution(Li_5(Al_(1-x)Fe_x)O_4)were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, N_2 adsorption-desorption and temperature-programmed desorption of CO_2. Results showed that 30 mol% of iron can be incorporated into the β-Li_5AlO_4 crystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li_5(Al_(1-x)Fe_x)O_4 samples chemisorbed CO_2 between 200 and 700 °C, where the superficial chemisorption presented the highest enhancement,in comparison to β-Li_5AlO _4. Additionally, Li_5(Al_(1-x)Fe_x)O_4 samples sintered at higher temperatures thanβ-Li_5AlO_4. Isothermal CO_2 chemisorption experiments of β-Li_5AlO_4 and Li_5(Al_(1-x)Fe_x)O_4 were fitted to a first order reaction model, corroborating that iron enhances the CO_2 chemisorption, kinetically. When oxygen was added to the gas flow, CO_2 chemisorption process was mainly enhanced between 400 and 600 °C for the Li_5(Al_(0.8)Fe_(0.2))O_4 sample in comparison to β-Li_5AlO_4. Hence, Li_5(Al_(1-x)Fe_x)O_4 solid solution presented an enhanced CO_2 chemisorption process, in the presence and absence of oxygen, in comparison to β-Li_5AlO_4.
Pentalithium aluminate(β-Li_5AlO_4) and the corresponding iron-containing solid solution(Li_5(Al_(1-x)Fe_x)O_4)were synthetized by solid-state reaction. All the samples were characterized structural and microstructurally by X-ray diffraction, solid-state nuclear magnetic resonance, scanning electron microscopy, N_2 adsorption-desorption and temperature-programmed desorption of CO_2. Results showed that 30 mol% of iron can be incorporated into the β-Li_5AlO_4 crystalline structure at aluminum positions. Moreover, iron addition induced morphological and superficial reactivity variations. Li_5(Al_(1-x)Fe_x)O_4 samples chemisorbed CO_2 between 200 and 700 °C, where the superficial chemisorption presented the highest enhancement,in comparison to β-Li_5AlO _4. Additionally, Li_5(Al_(1-x)Fe_x)O_4 samples sintered at higher temperatures thanβ-Li_5AlO_4. Isothermal CO_2 chemisorption experiments of β-Li_5AlO_4 and Li_5(Al_(1-x)Fe_x)O_4 were fitted to a first order reaction model, corroborating that iron enhances the CO_2 chemisorption, kinetically. When oxygen was added to the gas flow, CO_2 chemisorption process was mainly enhanced between 400 and 600 °C for the Li_5(Al_(0.8)Fe_(0.2))O_4 sample in comparison to β-Li_5AlO_4. Hence, Li_5(Al_(1-x)Fe_x)O_4 solid solution presented an enhanced CO_2 chemisorption process, in the presence and absence of oxygen, in comparison to β-Li_5AlO_4.
引文
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