Highly active manganese oxide catalysts for low-temperature oxidation of formaldehyde
Highly active manganese oxide catalysts for low-temperature oxidation of formaldehyde
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DOI：
10.1016/j.micromeso.2011.10.003
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发表时间：
2012-03
影响因子：
5.2
通讯作者：
Hua Tian;Junhui He;Linlin Liu;Donghui Wang;Z. Hao;Chun-yan Ma
中科院分区：
文献类型：
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作者：
Hua Tian;Junhui He;Linlin Liu;Donghui Wang;Z. Hao;Chun-yan Ma
采用微乳液法成功地制备了具有很高比表面积（高达154 m2/g）的水钠锰矿型锰氧化物。这些材料的形貌、表面积、孔径和表面还原度容易通过合成温度来定制。采用XRD、TEM、SEM、BET、H2-TPR等手段对产物的物化性能进行了表征。这些材料还在HCHO氧化中进行了催化测试，显示出显著高的催化活性。结果表明，这些材料的催化性能的差异是由于共同的影响，形貌，比表面积和表面还原度。纳米球催化剂的多孔性使得甲醛分子能够很容易地扩散到催化活性位点上，从而使纳米球具有很高的催化活性。表面积越大，其催化活性越高。表面还原度越高，甲醛氧化温度越低。最具活性的锰催化剂（BSW-120）在100°C下显示出100%的HCHO转化率。
Birnessite - type manganese oxides with very high surface areas (up to 154m2/g) were successfully prepared using a microemulsion process. The morphology, surface area, pore size, and the surface reducibility of these materials were readily tailored via the synthesis temperature. The physiochemical properties of the manganese oxides were characterized by means of XRD, TEM, SEM, BET and H2-TPR techniques. These materials were also catalytically tested in HCHO oxidation, showing significantly high catalytic activity. It was found that the differences in catalytic performance of these materials were jointly attributed to the effects of the morphology, surface area and surface reducibility. The highly porous feature of the catalyst with nanospheres could allow HCHO molecules to easily diffuse onto catalytically active sites, which endows the nanospheres with high catalytic activity. The higher the surface area, the higher its catalytic activity. A higher surface reducibility offered a lower temperature of HCHO oxidation. The most active manganese catalyst (BSW-120) showed a 100% HCHO conversion at 100°C.