Spherical potassium intercalated activated carbon beads for pulverised fuel CO2 post-combustion capture
Spherical potassium intercalated activated carbon beads for pulverised fuel CO2 post-combustion capture
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用于粉状燃料燃烧后二氧化碳捕集的球形插钾活性炭珠
DOI：
10.1016/j.carbon.2015.06.036
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发表时间：
2015-11-01
期刊：
影响因子：
10.9
通讯作者：
Sun, Yuhan
中科院分区：
文献类型：
--
作者：
Liu, Jingjing;Sun, Nannan;Sun, Yuhan
直径约为均匀的球形碳珠。0.6-0.8 mm，机械强度高。为了优化这些吸附剂用于粉状燃料燃烧后捕集的性能，已经研究了通过KOH处理的钾插层的功效，故意使用无氮酚醛树脂衍生的活性炭（AC）珠，使得通过钾插层实现的增强的CO2吸附可以从任何其他效果中描绘出来。在25 ° C和0.15巴的CO2分压下，K插层AC的吸附容量从未处理的碳的0.79 mmol/g增加到1.51 mmol/g，而对形态和机械强度的影响相对较小。据发现，只有略多于约。1重量%的K是必需的，以提供最大的好处，从插入，增加表面极性和对CO2的亲和力。由于吸附热适度增加（32-40 kJ/mol，而原始AC为27 kJ/mol），K-AC珠的CO2吸收量显着增加，再加上快速的吸附动力学，表明总体能量损失可能上级强碱性聚乙烯亚胺和其他用于碳捕获的基于胺的固体吸附剂系统。(C)2015年，作者。爱思唯尔有限公司出版
Spherical carbon beads with a uniform diameter of ca. 0.6-0.8 mm and high mechanical strength can be prepared by hydrothermal synthesis. To optimise the performance of these adsorbents for pulverised fuel post-combustion capture, the efficacy of potassium intercalation via a KOH treatment has been investigated, deliberately using nitrogen-free phenolic resin derived activated carbon (AC) beads so that the enhanced CO2 adsorption achieved by potassium intercalation could be delineated from any other effects. At 25 degrees C and CO2 partial pressure of 0.15 bar, the adsorption capacity of K-intercalated ACs nearly doubled from 0.79 mmol/g for the untreated carbons to 1.51 mmol/g whilst the effect on the morphology and mechanical strength is relatively small. It was found that only slightly more than ca. 1 wt.% of K is required to give the maximum benefit from intercalation that increases the surface polarity and the affinity towards CO2. The notably increased CO2 uptake of the K-AC beads as a result of modest increase in adsorption heat (32-40 kJ/mol compared to 27 kJ/mol for the original AC), coupled with the fast adsorption kinetics, suggest that the overall energy penalty is potentially superior to strongly basic polyethyleneimine and other amine-based solid adsorbent systems for carbon capture. (C) 2015 The Authors. Published by Elsevier Ltd.