Synthesis and characterization of manganese oxides employed in VOCs abatement
Synthesis and characterization of manganese oxides employed in VOCs abatement
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DOI：
10.1016/j.apcatb.2005.03.014
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发表时间：
2005-10-27
影响因子：
22.1
通讯作者：
Thomas, HJ
中科院分区：
文献类型：
--
作者：
Lamaita, L;Peluso, MA;Thomas, HJ
两种MnO2通过不同的方法制备：（i）MnCO3分解； (ii) 酸性 MnSO4 溶液的氧化。结合使用 X 射线衍射 (XRD)、DRIFTS、DRS-UV-vis 和 TGA 技术揭示： (i) Mn4+-Mn3+ 的存在； (ii) 结晶度差； (iii)高于200℃时的OH物种。对催化剂进行了乙醇完全氧化成二氧化碳和水的测试，反应结果表明，两种样品的催化活性均大于MnO2（软锰矿，β-MnO2）和Mn2O3（如方铁锰矿）氧化物。所制备的氧化物的高活性可能与 Mn3+ 和 Mn4+ 离子以及 Mn4+ 空位产生的 OH- 物质的同时存在有关。此外，原位 DRIFT 光谱证明了两种合成的锰氧化物之间乙醇吸附反应的不同机制。 (c) 2005 Elsevier B.V 保留所有权利。
Two MnO2 were prepared by different methods: (i) MnCO3 decomposition; and (ii) oxidation of acid MnSO4 solution. The combined use of X-ray diffraction (XRD), DRIFTS, DRS-UV-vis and TGA techniques revealed: (i) the presence of Mn4+-Mn3+; (ii) a poor crystallinity; and (iii) OH species at temperatures higher than 200 degrees C.The catalysts were tested in the complete oxidation of ethanol to carbon dioxide and water, and the reaction results showed that the catalytic activity of both samples were larger than MnO2 (pyrolusite, beta-MnO2) and Mn2O3 (like bixbyite) oxides. The high activity of the prepared oxides can be related to the simultaneous presence of Mn3+ and Mn4+ ions and OH- species generated by Mn4+ vacancies. In addition, in situ DRIFT spectroscopy demonstrated a different mechanism of adsorption-reaction of ethanol between the two synthesized manganese oxides. (c) 2005 Elsevier B.V All rights reserved.