Facile synthesis of amorphous mesoporous manganese oxides for efficient catalytic decomposition of ozone

Liu Shuilian; Ji Jian; Yu YiHuang Haibao

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Facile synthesis of amorphous mesoporous manganese oxides for efficient catalytic decomposition of ozone

机译：灵巧的非晶态介孔锰的合成为有效的催化分解氧化物臭氧

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Amorphous mesoporous manganese oxides (MnOx) with different microstructures were synthesized via a facile redox method between manganese acetate and potassium permanganate by modulating the addition sequence of the precursors and directly used for catalytic decomposition of ozone. The as-prepared catalysts were characterized by N-2 physisorption, SEM, TEM, XRD, Raman, H-2-TPR, O-2-TPD, TGA, and XPS. Amorphous mesoporous MnOx had more surface oxygen vacancies and larger specific surface area than calcined MnOx with high crystallinity and exhibited superior ozone decomposition activity at room temperature. Kinetic study and characterization results revealed that the lower oxidation state of Mn resulting from mixed Mn2+, Mn3+ and Mn4+ in amorphous mesoporous MnOx was more favorable for activating ozone towards high initial ozone conversion. Moreover, the catalytic stability of amorphous mesoporous MnOx strongly depended on the relative humidity, and the elevation of the oxidation state and the accumulation of surface adsorbed water molecules possibly led to the catalyst deactivation. These results may shed new light on the design of novel amorphous manganese-based catalysts for ozone decomposition.

机译：非晶态介孔锰氧化物(MnOx)不同的微观结构是通过合成的在醋酸锰和温和的氧化还原方法通过调节添加高锰酸钾序列的前兆和直接用于催化分解臭氧。催化剂被n -特征物理吸附,SEM, TEM, XRD,拉曼,H-2-TPR,O-2-TPD、TGA和XPS。有更多的表面氧空位和大比表面积比煅烧MnOx高结晶度和表现出优越的臭氧在室温下分解的活动。动力学研究和表征结果透露,Mn的低氧化态造成混合Mn2 + Mn3 +和Mn4 +非晶态介孔MnOx更适合激活臭氧对高初始臭氧转换。非晶态介孔MnOx强烈依赖相对湿度、海拔的氧化态和表面的积累吸附水分子可能导致催化剂失活。对新型非晶态的设计manganese-based臭氧的催化剂分解。

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来源
《Catalysis science & technology》 |2018年第16期|4264-4273|共10页
作者
Liu Shuilian; Ji Jian; Yu YiHuang Haibao;
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作者单位

Sun Yat Sen Univ, Sch Environm Sci & Engn, 132 East Waihuan Rd, Guangzhou 510006, Guangdong, Peoples R China;

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原文格式 PDF
正文语种英语
中图分类汉语教学;
关键词
Potassium Permanganate; manganese oxides; CatalysisSPECIFIC AREAozonemesoporous materialsdecompositionnoncrystallineOxidation StateManganese AcetateCatalyst deactivationlighting design;

机译：高锰酸钾;锰氧化物;CatalysisSPECIFIC AREAozonemesoporousmaterialsdecompositionnoncrystallineOxidationStateManganese AcetateCatalystdeactivationlighting设计;

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Facile synthesis of amorphous mesoporous manganese oxides for efficient catalytic decomposition of ozone

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