【摘要】 采用不同浓度的氨水作为活化剂制备活性炭,引入含氮官能团以提高活性炭对CO2的吸附能力和CO2/CH4吸附选择性。对活性炭的孔结构和表面化学性质进行了表征,活性炭的表面化学性质分别通过傅里叶变换红外光谱、酸碱滴定和X射线光电子能谱等方法进行表征,并测定了活性炭对CO2和CH4的吸附等温线。结果显示,与纯水活化活性炭相比,采用氨水活化制备活性炭增加了表面含氮官能团,主要是吡啶类、胺或腈类基团的数量,同时减少了含氧官能团的数量。这些基团使得活性炭表面具有更强的碱性,从而使氨水活化活性炭具有更强的CO2吸附能力和CO2/CH4吸附选择性。更多还原

【Abstract】 In this work, a series of activated carbon were prepared using different concentration of ammonia water as activator. The adsorption capacity of CO2 and CO2/CH4 adsorptive selectivity of activated carbon was improved comparing to the activated carbon using pure water as activator on account of introducing nitrogen-containing groups. The activated carbon were characterized, and the surface chemical properties of the activated carbon were determined by FTIR, acid base titration and X-ray photoelectron spectroscopy(XPS) methods. And the isotherms of CO2 and CH4on the activated carbon were measured. The results show that the amounts of the surface nitrogencontaining groups, the pyridine, amine or nitrile nitrogen is mainly, of the activated carbon activated using ammonia water increased, while those of the surface oxygen-containing groups decreased as compared to the activated carbon using pure water as activator. As a consequence of that, the use of ammonia water as activator made the activated carbon had stronger alkaline, higher adsorption capacity of CO2 and CO2/CH4 adsorptive selectivity.更多还原