| 氧化锰八面体分子筛的合成及其对苯催化氧化性能 |
| 摘要点击 1367 全文点击 1024 投稿时间：2011-05-10 修订日期：2011-08-10 |
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| 中文关键词 氧化锰 八面体分子筛 苯 催化氧化 VOC |
| 英文关键词 manganese oxide octahedral molecular sieves benzene catalytic oxidation volatile organic compounds (VOC) |
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| 中文摘要 |
| 采用回流的方法,制备了氧化锰八面体分子筛(OMS-2)纳米棒.利用X射线衍射(XRD)、扫描电子显微镜(SEM)、氮气吸附-脱附、程序升温还原(H2-TPR)分别对产物进行晶型、形貌、孔径和H2还原性能进行分析,并考察不同煅烧温度下的催化剂对苯的催化氧化性能及300℃煅烧催化剂的稳定性.结果表明,煅烧温度对氧化锰八面体分子筛(OMS-2)的表面特征有显著的影响,煅烧温度越高,比表面积和孔容越小,平均孔径越大.同时随着煅烧温度的增加,催化剂对苯的催化氧化性能降低.经300℃煅烧的催化剂对苯的催化活性最佳,反应温度为200℃时,苯的转化率达到了50%;当反应温度为250℃时,苯的转化率达到90%.经300℃煅烧的催化剂在260℃下70 h内,对苯的催化氧化性能降低了5%,具有良好的稳定性. |
| 英文摘要 |
| Manganese oxide octahedral molecular sieves (OMS-2) for VOCs catalytic combustion were synthesized by refluxing method. The crystal structure, particle morphology, pore structure and H2-reduction ability were characterized by XRD, SEM, N2 adsorption-desorption and H2-TPR techniques. The catalytic activities of the OMS-2 calcined at different temperatures in benzene combustion and the stability of the sample calcined at 300℃ were evaluated. The results indicated that the effect of calcinations temperature on the surface characters of catalysts was remarkable. With higher calcination temperature, the samples showed lower surface area and pore volume, but larger average pore size. At the same time, high calcination temperature leaded to low activity. The benzene conversion of the sample calcined at 300℃ was 50%℃ at 200℃ and 90% at 250℃, respectively. The catalytic activity exhibited only 5% reduction after reaction at 260℃ for 70 h, which indicated that the as-made catalysts were very stable after calcination at 300℃. |
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