Development of biomass derived highly porous fast adsorbents for post-combustion CO2 capture
Development of biomass derived highly porous fast adsorbents for post-combustion CO2 capture
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DOI：
10.1016/j.fuel.2020.118506
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发表时间：
2020-12-15
期刊：
影响因子：
7.4
通讯作者：
Rashid, Tazien
中科院分区：
文献类型：
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作者：
Sher, Farooq;Iqbal, Sania Zafar;Rashid, Tazien
本研究对软木或非木质(花生壳)、中间木质(核桃壳)和硬质木质(松木)三组生物质进行了比较筛选，以开发燃烧后二氧化碳捕集(超过N-2平衡)的吸附剂/活性碳。针对CO2人为排放的热点问题，选择了三组不同的生物质残渣，研究了该材料在吸附和选择合成CO2吸附剂原料中的作用和性质，为今后的研究做好准备。用热重分析仪(TGA)研究的吸附等温线表明，在25℃时，CO2的吸附容量为2.53-3.92 mmol/g(超过N-2平衡)。新合成的活性碳(ACS)在最初的2分钟内表现出41-94%的快速吸附速率。通过扫描电子显微镜表面形态分析，可以清楚地看到具有催化KOH活化作用的多孔表面的发展，S从数学上证实了BET在146.86到944.05 m(2)/g之间。红外和X射线衍射峰证实了有助于酸性二氧化碳捕获的碱性或无机富氧部分的产生。吸附等温线还表明，较高吸附基团的顺序为：花生壳>；松木>；核桃壳，最佳活化质量比(样品/KOH)为1：3。合成的低成本AC，每公斤生产1.93美元，有助于克服二氧化碳和生物质废弃物对环境造成的危害和问题。
This study is carried out for a comparative screening of three groups of biomasses; soft or non-woody (peanut shell); intermediate woody (walnut shell) and hard woody (pine wood) for the development of adsorbents/activated carbons for post-combustion CO2 capture (over N-2 balance). Three different groups of biomass residues are selected to study the role and nature of the material in adsorption and selection of the raw material for CO2 adsorbents synthesis for future researches because of the hot issue of anthropogenic CO2 emissions. The adsorption isotherms studied by the thermal gravimetric analyser (TGA) revealed that CO2 adsorption capabilities are in the range of 2.53-3.92 mmol/g (over N-2 balance) at 25 degrees C. The newly synthesised activated carbons (ACs) exhibited a fast rate of adsorption as 41-94% in the initial 2 min. Porous surface development with catalytic KOH activation is seen clearly through SEM surface morphological analyses and mathematically confirmed from S BET ranges from 146.86 to 944.05 m(2)/g. FTIR and XRD peaks verify the generation of basic or inorganic O-2-rich moieties that help in acidic CO2 capture. It has also been observed from adsorption isotherms that the order of higher adsorption groups is as; peanut shell > pine wood > walnut shell, while the best activation mass ratio (sample/KOH) is 1:3. The synthesised low cost ACs with an amount of 1.93 US$ per kg production could help to overcome the environmental hazards and problems caused by CO2 and biomass waste.