Geopolymers as solid adsorbent for CO2 capture
Geopolymers as solid adsorbent for CO2 capture
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DOI：
10.1016/j.ces.2016.04.013
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发表时间：
2016-07-12
影响因子：
4.7
通讯作者：
Doghieri, Ferruccio
中科院分区：
文献类型：
--
作者：
Minelli, Matteo;Medri, Valentina;Doghieri, Ferruccio
制备了一种新型的碱键合陶瓷地聚合物材料，采用体积法研究了其在亚大气压范围内对CO2和轻气体（CH4和N-2）的吸附性能。样品是由铝硅酸盐粉末与碱硅酸盐水溶液反应，在不同的稀释比例，实现非常高的地聚合转化率（高于97%）。通过扫描电镜和孔隙度测量对其微观结构和织构特性进行了表征，结果表明该地聚合物的结构主要由纳米沉淀物和介孔组成，总体孔隙度为30% ~ 60%，BET表面积可达50 m(2)/g。气体吸附性能分析表明，地聚合物单体对CO2的吸附能力较好，显著高于对CH4和N-2的吸附能力，表明这些地聚合物具有显著的选择性捕获CO2的能力。从吸附测量中获得的容量选择性值，CO2/N-2和CO2/CH4分离分别高达200和100，远远高于此类应用中通常使用的大多数吸附剂材料。(C) 2016 Elsevier Ltd.版权所有。
Geopolymer materials, a new class of alkali-bonded ceramics, have been prepared in monolith porous form, in order to investigate the adsorptive performances of CO2 and light gases (CH4 and N-2) by means of a volumetric method in the sub-atmospheric pressure range. The samples have been produced by reacting an aluminosilicate powder with an aqueous alkali silicate solution, in different dilution proportions, achieving very high geopolymerization conversion (higher than 97%). The monoliths micro structural and textural properties have been first characterized by SEM and porosimetric measurements, which revealed the structure of the geopolymer as mainly consisting of nanoprecipitates and mesopores, with overall porosity from 30% up to 60%, and BET surface area up to 50 m(2)/g.The analysis of the gas adsorption properties showed a quite good capacity for CO2 in the geopolymer monoliths, remarkably higher than those of CH4 and N-2, pointing out the significant ability in the selective capture of CO2 of these geopolymers. The values of selectivity in capacity obtained from the adsorption measurements, up to 200 and 100 for CO2/N-2 and CO2/CH4 separation, respectively, are considerably higher than those of most of the adsorbent materials commonly accounted for in such applications. (C) 2016 Elsevier Ltd. All rights reserved.