Department of Energy Science and Technology, Myongji University, Myongji-ro 116, Nam-dong, Cheoin-gu, Yongin-si, Gyeonggi-do 17058, South Korea.
Department of Energy Science and Technology, Myongji University, Myongji-ro 116, Nam-dong, Cheoin-gu, Yongin-si, Gyeonggi-do 17058, South Korea.
J Colloid Interface Sci. 2017 Jul 15;498:55-63. doi: 10.1016/j.jcis.2017.03.046. Epub 2017 Mar 10.
Magnesium oxide (MgO) is a promising candidate for carbon dioxide (CO) capture at high temperature applicable to pre-combustion capture in an integrated gasification combined cycle (IGCC) scheme. In this work, mesoporous MgO nanoparticles were synthesized via simple complexation-combustion method by using glycine (G) and urea (U) as fuels (F). The obtained sorbents were thoroughly characterized in terms of the crystalline structure, morphology, nature of the fuel, F/O ratio, and their consequent effects on CO sorption. It was observed that due to the complexation followed by combustion in the presence of glycine, MgO with crystallite size as small as∼8nm could be derived. The synthesized MgO nanoparticles exhibited exceptionally high CO sorption at elevated temperatures. Furthermore, CO sorption isotherms in assistance with FT-IR and DSC experiments demonstrated that the low CO uptake at ambient temperature (25-100°C) may be due to the formation of monodentate carbonates, whereas predominant bicarbonates enhance the CO uptake at elevated temperatures (100-300°C). MgO-1.5(G) obtained the highest sorption corresponding to 1.34mmol/g at 200°C.
氧化镁（MgO）是一种很有前途的候选物质，可用于高温下二氧化碳（CO）的捕获，适用于整体煤气化联合循环（IGCC）方案中的预燃烧捕获。在这项工作中，通过使用甘氨酸（G）和尿素（U）作为燃料（F）的简单络合-燃烧法合成了介孔 MgO 纳米粒子。从结晶结构、形态、燃料性质、F/O 比及其对 CO 吸附的影响等方面对所得吸附剂进行了彻底的表征。结果表明，由于在甘氨酸存在下的络合随后发生燃烧，因此可以得到晶粒尺寸小至∼8nm 的 MgO。合成的 MgO 纳米粒子在高温下表现出异常高的 CO 吸附性能。此外，CO 吸附等温线结合 FT-IR 和 DSC 实验表明，环境温度（25-100°C）下 CO 吸附量低可能是由于形成了单齿碳酸盐，而在高温下（100-300°C）主要是碳酸氢盐增强了 CO 的吸附。在 200°C 时，MgO-1.5(G) 获得了最高的吸附量，对应 1.34mmol/g。
