Elvira Gutiérrez-Bonilla, Francisco Granados-Correa, Víctor Sánchez-Mendieta, Alberto Morales-Luckie Raúl
National Institute of Nuclear Research, Department of Chemistry, A.P. 18-1027, Col. Escandón, Miguel Hidalgo Delegation, Zip Code 1180 México D.F., México; Autonomous University of México State, Faculty of Chemistry, Colón avenue, intersection with ride Tollocan s/n Toluca, México, México.
National Institute of Nuclear Research, Department of Chemistry, A.P. 18-1027, Col. Escandón, Miguel Hidalgo Delegation, Zip Code 1180 México D.F., México.
J Environ Sci (China). 2017 Jul;57:418-428. doi: 10.1016/j.jes.2016.11.016. Epub 2016 Dec 30.
A series of MgO-based adsorbents were prepared through solution-combustion synthesis and ball-milling process. The prepared MgO-based powders were characterized using X-ray diffraction, scanning electron microscopy, N physisorption measurements, and employed as potential adsorbents for CO adsorption. The influence of structural and textural properties of these adsorbents over the CO adsorption behaviour was also investigated. The results showed that MgO-based products prepared by solution-combustion and ball-milling processes, were highly porous, fluffy, nanocrystalline structures in nature, which are unique physico-chemical properties that significantly contribute to enhance their CO adsorption. It was found that the MgO synthesized by solution combustion process, using a molar ratio of urea to magnesium nitrate (2:1), and treated by ball-milling during 2.5hr (MgO-BM2.5h), exhibited the maximum COadsorption capacity of 1.611mmol/g at 25°C and 1atm, mainly via chemisorption. The CO adsorption behaviour on the MgO-based adsorbents was correlated to their improved specific surface area, total pore volume, pore size distribution and crystallinity. The reusability of synthesized MgO-BM2.5h was confirmed by five consecutive CO adsorption-desorption times, without any significant loss of performance, that supports the potential of MgO-based adsorbent. The results confirmed that the special features of MgO prepared by solution-combustion and treated by ball-milling during 2.5hr are favorable to be used as effective MgO-based adsorbent in post-combustion CO capture technologies.
通过溶液燃烧合成和球磨工艺制备了一系列氧化镁基吸附剂。使用X射线衍射、扫描电子显微镜、N物理吸附测量对制备的氧化镁基粉末进行了表征，并将其用作CO吸附的潜在吸附剂。还研究了这些吸附剂的结构和织构性质对CO吸附行为的影响。结果表明，通过溶液燃烧和球磨工艺制备的氧化镁基产品本质上是高度多孔、蓬松的纳米晶体结构，这些独特的物理化学性质显著有助于提高其CO吸附能力。研究发现，通过溶液燃烧法合成的氧化镁，使用尿素与硝酸镁的摩尔比为2:1，并在2.5小时内进行球磨处理（MgO-BM2.5h），在25°C和1个大气压下表现出最大CO吸附容量为1.611mmol/g，主要通过化学吸附。氧化镁基吸附剂上的CO吸附行为与其改善的比表面积、总孔体积、孔径分布和结晶度相关。连续五次CO吸附-解吸循环证实了合成的MgO-BM2.5h的可重复使用性，且性能没有任何显著损失，这支持了氧化镁基吸附剂的潜力。结果证实，通过溶液燃烧制备并在2.5小时内进行球磨处理的氧化镁的特殊特性有利于在燃烧后CO捕集技术中用作有效的氧化镁基吸附剂。
