凹凸棒石负载有机胺用于沼气提纯的优化制备研究
摘要：摘要凹凸棒石原矿吸附剂对CO2的吸附量较低,不利于其在沼气提纯中的实际应用。因此,如何有效提高凹凸棒石的CO2捕集能力是未来的研究重点。通过对凹凸棒石原矿进行酸改性处理,考察酸浓度和酸化时间对凹凸棒石组成、结构和性能的影响,采用扫描电镜（SEM）、X射线荧光光谱（XRF）、X射线衍射（XRD）和N2吸附/脱附等手段进行表征。结果表明,在硫酸浓度为3 mol/L、酸化时间为72 h的条件下,所得到的凹凸棒石基无定型SiO2（α-SiO2）具有较高的比表面积和孔容并具有丰富的表面Si‒OH基团,其负载聚乙烯亚胺的CO2吸附量达到3.21 mmol/g。这是由于酸改性去除了凹凸棒石层间杂质以及金属阳离子氧化物,从而改善了凹凸棒石的结构和性能,使氨基活性位点得到均匀地分散,提高了对CO2的捕集性能。
Abstract:：Crude attapulgite (ATP) adsorbent has a low capacity for CO2 adsorption, which is not conducive to its practical application in biogas upgrading. Therefore, how to effectively improve the CO2 capture capacity of crude ATP adsorbent is the focus of future research. In this paper, crude ATP was treated by acid modification to investigate the influences of acid concentration and acidification time on the composition, structure, and properties of ATP. Scanning electron microscope (SEM), X-ray fluorescence (XRF), X-ray diffraction (XRD), and N2 adsorption/desorption were used to characterize the acid-activated ATP (H+-ATP). The results showed that under conditions of sulfuric acid concentration of 3 mol/L and acidification time of 72 h, the obtained H+-ATP-based amorphous SiO2 (α-SiO2) owned higher specific surface area, pore volume, and more abundant surface Si‒OH groups, and the CO2 adsorption capacity was 3.21 mmol/g after loading polyethyleneimine. This is due to the removal of interlaminar impurities and metal cationic oxides by acid modification, which improves the structure and properties of ATP and promotes the dispersion of amino active sites, thus enhancing the CO2 adsorption capacity.
中文标题：凹凸棒石负载有机胺用于沼气提纯的优化制备研究
英文标题：Optimized Preparation of Attapulgite Supporting Organic Amine for Biogas Upgrading
发表时间：2022-08-09
作者：
卞可, 张海荣, 王璨, 黎海龙, 王梦琨, 姚时苗, 熊莲, 郭海军, 陈新德
作者简介：
卞 可（1997-）,男,硕士研究生,主要从事CO<sub>2</sub>捕集和非金属黏土矿物的高值化利用研究。郭海军（1986-）,男,副研究员,主要从事CO<sub>2</sub>捕集及合成气转化制备液体燃料和化工品的研究。陈新德（1967-）,男,教授级高级工程师,主要从事生物质高值化利用研究。
关键词：凹凸棒石,酸改性,沼气提纯,有机胺,无定型SiO2,
Key words：attapulgite,acid modification,biogas upgrading,organic amine,amorphous SiO2,
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