Highly active OMS-2 for catalytic ozone decomposition under humid conditions

Highly active OMS-2 for catalytic ozone decomposition under humid conditions
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高活性 OMS-2,用于潮湿条件下催化臭氧分解

DOI:
10.1007/s12182-019-0335-5
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发表时间:
2019-08
期刊:
影响因子:
5.6
通讯作者:
Ying Wei
Ying Wei
中科院分区:
工程技术2区
文献类型:
--
作者:
Bo Peng;Wenjing Boa;Linlin Wei;Runduo Zhang;Zhoujun Wang;Zhichun Wang;Ying Wei

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以KMnO 4和MnAc 2为原料,通过一步水热反应,改变KMnO 4和MnAc 2的摩尔比,制备了4种隐钾锰矿型八面体分子筛(OMS)-2-X(X为KMnO 4/MnAc 2的摩尔比)催化臭氧分解的材料。采用N2吸附-脱附、X射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)、H2程序升温还原(H2-TPR)和X射线光电子能谱(XPS)等手段对样品进行了表征。其中,OMS-2-0.7样品在90%的高相对湿度(RH)和585,000 h-1的气时空速下表现出最佳的O3转化率,为92%。因此,这被认为是在高RH气氛下净化含臭氧废气的可能途径。所制备的OMS-2-X样品的臭氧分解效率被发现与比表面积,颗粒尺寸,表面氧空位,和Mn 3+阳离子量有关。一步水热合成法是一种制备具有臭氧分解活性的OMS-2固体的简单方法。
Four kinds of cryptomelane-type octahedral molecular sieve (OMS)-2-X (the X represents the molar ratio of KMnO4/MnAc2) were prepared as catalytic materials for ozone decomposition through a one-step hydrothermal reaction of KMnO4and MnAc2, by changing their molar ratios. These samples were characterized by N2adsorption–desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), temperature programmed reduction by H2(H2-TPR) and X-ray photoelectron spectroscopy (XPS). Among them, the OMS-2-0.7 sample showed the best O3conversion of 92% under high relative humidity (RH) of 90% and gas hourly space velocity of 585,000 h−1. This was accordingly thought as a possible way for purifying ozone-containing waste gases under high RH atmospheres. The efficiency of ozone decomposition of the prepared OMS-2-X sample was found to be related to specific surface area, particle size, surface oxygen vacancies, and Mn3+cation amounts. The one-step hydrothermal synthesis was shown to be a simple method to prepare the considerably active OMS-2 solids for ozone decomposition.
轻松合成具有高氧空位含量的铁改性氧化锰,可有效破坏空气中的臭氧
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