【摘要】 采用氧化还原法一步制备了掺杂Ag的氧化锰八面体分子筛（Ag-OMS-2）,用于吸附-放电等离子体催化过程脱除湿空气中的甲醛.采用X射线衍射（XRD）、N₂物理吸附-脱附（BET）、X射线光电子能谱（XPS）、H₂程序升温还原（H₂-TPR）、原位漫反射傅里叶变换红外光谱（In-suit DRIFT）等分析手段对Ag-OMS-2的结构和理化性质进行表征.XRD和BET结果表明,掺杂的Ag高度分散在OMS-2表面或孔道中,并未改变OMS-2的cryptomelane-Q型一维孔道结构;XPS结果表明,Ag的掺杂明显提高了表面晶格氧O_latt/弱吸附氧物种O_ads和Mn³⁺/Mn⁴⁺的比值,导致Ag-OMS-2表面生成更多的氧空位;H₂-TPR结果表明,Ag的掺杂降低了Ag-OMS-2的还原温度;In-suit DRIFT结果表明,Ag的掺杂增强了甲醛在Ag-OMS-2表面的化学吸附,且促使部分吸附甲醛进一步氧化为碳酸氢盐物种.吸附-放电等离子体催化过程实验结果表明,Ag-OMS-2表现出优良的选择性吸附甲醛和等离子体催化完全氧化吸附态甲醛的能力.红外光谱（IR）对反应产物在线检测结果表明,吸附态甲醛可抑制空气放电过程中NO_x的生成.Ag-OMS-2在5次"吸附-放电"循环实验中保持稳定,可发展为一种高效净化室内空气中甲醛的吸附材料.更多还原

【Abstract】 Ag-doped manganese oxide octahedral molecular sieves（Ag-OMS-2） were synthesized by one-step redox method,and used for formaldehyde removal from moist air via a cycled adsorption-discharge plasma catalytic process.The morphological structure and physicochemical properties were characterized by XRD,BET,XPS,H₂-TPR,and In-suit DRIFT.The XRD and BET results showed that the adsorbents retained the cryptomelane type manganese octahedral molecular sieves,and the doped Ag was highly dispersed on the surface and in the channel of OMS-2.The XPS results implied that the ratio of O_latt/O_ads and Mn³⁺/Mn⁴⁺ on the surface of Ag-OMS-2 increased with the loading of Ag,which would cause more oxygen vacancy sites.The H₂-TPR results suggested that the reduction temperature of the adsorbents reduced with the loading of Ag.The In-suit DRIFT results demonstrated that the Ag could enhance chemical adsorption of formaldehyde on Ag-OMS-2 surface,and promote further oxidation of adsorbed formaldehyde to hydrocarbonate.The adsorption-discharge plasma catalytic process results showed that Ag-OMS-2 exhibited excellent performance for formaldehyde adsorption and complete catalytic oxidation of adsorbed formaldehyde to CO₂.The IR results proved that NO_x production in air plasma was suppressed significantly with the presence of adsorbed formaldehyde.Five consecutive formaldehyde adsorption-discharge cycles indicated that Ag-OMS-2 was very stability,and it would be a promising adsorbent for formaldehyde removal in indoor air.更多还原