CO2 吸附在变性水合酸交换蒙莫里隆尼特丰富的粘土上
Niels Mendel1, Diana Sîreţanu2, Igor Sîreţanu1
1Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
概括
蒙莫里隆石 (MMT) 能够有效地吸附二氧化碳 (CO2),当中间层酸被水化并去除多余的水时. 低成本的Mg和Ca-bentonites对循环二氧化碳捕获和分离有希望.
科学领域:
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
- 地质化学 地质化学
背景情况:
- 层状膨胀粘土矿物质,如蒙莫里隆石 (MMT),在它们的间层画廊中表现出竞争性和协同的CO2和H2O吸附.
- 了解影响MMT二氧化碳吸附的因素对于开发有效的碳捕获技术至关重要.
研究的目的:
- 调查介层子,相对湿度和水合史对MMT和MMT丰富的班托尼特中二氧化碳吸附的影响.
- 确定二氧化碳吸附的最佳条件,并确定适合碳捕获的低成本土酸材料.
主要方法:
- 吸附实验是对MMT和本托尼特样本进行的,这些样本具有不同的中间层子 (例如,Cs+,Na+,Mg2+,Ca2+).
- 系统地控制了相对湿度水平和水化/脱水史.
- 在接近环境温度和压力时测量了二氧化碳吸附异热体.
主要成果:
- 二氧化碳吸附需要足够宽的间层画廊,通过大或化酸实现.
- 在增加的湿度下,Na-MMT和最初无水的Mg-/Ca-MMT显示出有限的CO2吸收.
- 和Ca-MMT在水合后表现出有效的二氧化碳吸附,然后进行轻度干燥,保持阴离子水合,同时去除多余的水.
结论:
- 介层酸的水合状态和共同吸附水的管理对于MMT的高效二氧化碳吸附至关重要.
- 低成本,天然的Mg和Ca-bentonites是循环CO2吸附和分离的可行候选者,因为它们的稳定性和有利的吸附特性.
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