N-Doped Polypyrrole-Based Porous Carbons for CO2 Capture
N-Doped Polypyrrole-Based Porous Carbons for CO2 Capture
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DOI：
10.1002/adfm.201100291
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发表时间：
2011-07-22
影响因子：
19
通讯作者：
Fuertes, Antonio B.
中科院分区：
文献类型：
--
作者：
Sevilla, Marta;Valle-Vigon, Patricia;Fuertes, Antonio B.
以KOH为活化剂，聚吡咯（PPy）为碳前驱体，成功制备了高孔n掺杂碳。研究了这些材料作为CO2捕获的吸附剂。在600 ~ 800℃的不同温度下，在重度（KOH/PPy = 4）和轻度（KOH/PPy = 2）活化条件下进行活化过程。温和活性炭具有两个重要的特征：1)它们含有大量的氮官能基团（高达10.1 wt% N），鉴定为吡啶-N，并含有少量的吡啶-N基团；2)与KOH/PPy = 4制备的碳相比，它们表现出更窄的微孔尺寸。这两种性质的结合解释了温和活性炭的大CO2吸附能力。特别是CO2吸收率极高，达6.2 mmol。在KOH/PPy = 2和600℃（1700 m(2)）条件下制备的多孔碳得到g(-1)（0℃）。g(-1)，孔径约为1 nm， 10.1% wt% N)。此外，我们观察到这些多孔碳具有高的CO2吸附率，对CO2- n -2有良好的选择性分离，并且易于再生。
Highly porous N-doped carbons have been successfully prepared by using KOH as activating agent and polypyrrole (PPy) as carbon precursor. These materials were investigated as sorbents for CO2 capture. The activation process was carried out under severe (KOH/PPy = 4) or mild (KOH/PPy = 2) activation conditions at different temperatures in the 600-800 degrees C range. Mildly activated carbons have two important characteristics: i) they contain a large number of nitrogen functional groups (up to 10.1 wt% N) identified as pyridonic-N with a small proportion of pyridinic-N groups, and ii) they exhibit, in relation to the carbons prepared with KOH/PPy = 4, narrower micropore sizes. The combination of both of these properties explains the large CO2 adsorption capacities of mildly activated carbon. In particular, a very high CO2 adsorption uptake of 6.2 mmol.g(-1) (0 degrees C) was achieved for porous carbons prepared with KOH/PPy = 2 and 600 degrees C (1700 m(2).g(-1), pore size approximate to 1 nm and 10.1 wt% N). Furthermore, we observed that these porous carbons exhibit high CO2 adsorption rates, a good selectivity for CO2-N-2 separation and it can be easily regenerated.