CO2 capture by Mg–Al and Zn–Al hydrotalcite-like compounds
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- 作者：Thiago M. Rossi ; Juacyara C. Campos ; Mariana M. V. M. Souza
- 关键词：Hydrotalcite ; like compounds ; Basic sites ; Adsorption ; Carbon dioxide
- 刊名：Adsorption
- 出版年：2016
- 出版时间：February 2016
- 年：2016
- 卷：22
- 期：2
- 页码：151-158
- 全文大小：759 KB
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Juacyara C. Campos (1)
Mariana M. V. M. Souza (1)
1. Escola de Química, Universidade Federal do Rio de Janeiro (UFRJ), Centro de Tecnologia, Bloco E, Sala 206, Rio de Janeiro, RJ, CEP 21941-909, Brazil - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Surfaces and Interfaces and Thin Films
Industrial Chemistry and Chemical Engineering
Engineering Thermodynamics and Transport Phenomena - 出版者：Springer Netherlands
- ISSN：1572-8757
文摘
Hydrotalcite-like compounds (HTC) are distinguished by their properties for CO2 capture, like high surface area, basic sites, thermal stability and good adsorption/desorption efficiency. Mg–Al e Zn–Al HTCs with Al3+ molar ratios x = 0.20, 0.28 and 0.33 were synthesized by coprecipitation, and subsequently calcined at 400 °C. For both HTCs, X-ray diffraction patterns have attested the formation of mixed oxides through calcination. The amount of basic sites, measured by temperature-programmed desorption of CO2, decreases as x increases. The CO2 adsorption was performed in a thermogravimetric balance using an adsorption temperature of 50 °C. Mg–Al and Zn–Al samples with x = 0.33 molar composition presented the highest CO2 adsorption, 0.91 and 0.21 mmol g−1, respectively. The Langmuir isotherm fitted well to the experimental data. It was also found that increasing the number of adsorption/desorption cycles the CO2 adsorption decreases, which is associated with the irreversible chemisorption. Keywords Hydrotalcite-like compounds Basic sites Adsorption Carbon dioxide