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为实现NOx的高效吸附,制备了Ge为中心原子的锗钨杂多酸H4Ge W12O40(缩写为HGe W),利用红外光谱确认了其杂多酸结构后,研究了HGe W对NOx的吸附与脱附性能。结果表明:所制备的HGe W具有NOx吸附能力,230℃时,HGe W对NOx的吸附去除率达74%,吸附容量为16.5 mg NOx/g;通过对吸附NOx后的HGe W进行红外表征发现,NOx的吸附形式主要为[H+(NO-2,NO+)]以及少量的亚硝酰基(NO·);被HGe W吸附的NOx在降低温度时可通过水蒸气反取代方式实现快速脱附,由于脱附剂水分子及时补充了NOx脱附而产生的空位,无需辅助活化即可实现HGe W的重复使用。
In order to achieve efficient adsorption of NOx, a Ge-centered germanium-tungsten heteropoly acid H4Ge W12O40 (abbreviated as HGe W) was prepared. The heteropoly acid structure was confirmed by infrared spectroscopy. The adsorption and removal of NOx by HGe W With performance. The results show that the prepared HGe W possesses the ability of adsorbing NOx. The HGW W has a NOx removal efficiency of 74% and an adsorption capacity of 16.5 mg NOx / g at 230 ℃. The infrared characterization of HGe W adsorbed NOx shows that, , The main form of NOx adsorption is [H + (NO-2, NO +)] and a small amount of nitrosyl (NO ·); NOx adsorbed by HGe W can be rapidly desorbed by water vapor desorption when the temperature is decreased, Since the desorbent water molecule replenishes the vacancies generated by the desorption of NOx in time, reuse of HGe W can be achieved without auxiliary activation.