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yingxingwang银虫 (小有名气)
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[求助]
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3.3. Effect of specific surface area on the activity Generally, the specific surface area plays an important role in catalyst activity. Liu et al. and Schurz et al. reported that the activities of OMS-2 catalysts were correlated to their specific surface areas in the oxidation of cyclohexanol and benzyl alcohol.In our study, the specific surface area did not fit very well with the catalytic activity trend. For instance, the Fe-OMS-2 catalyst with the largest specific surface area (58 m /g) showed the lowest activity, while the Cu-OMS-2 catalyst with relatively smaller specific surface area (47 m /g) exhibited the best activity. Therefore,the specific reaction rates (Rs), namely, the amounts of DME consumed per unit of surface area and per second at 180 °C, were employed to eliminate the effect of specific surface area [32,33].According to our previous studies, the Rs could reflect the catalytic activity trend very well [21]. As shown in Table 1, the Rs values are in the following order: Cu-OMS-2 > Ni-OMS-2 > Co-OMS-2 > Fe-OMS-2 > Cr-OMS-2, which agrees well with the catalytic activity trend. For example, the Cu-OMS-2 catalyst with the highest Rs (1.50 lmol/(s m ).) has the best activity, and Cr-OMS-2 catalyst with the lowest Rs (0.072 lmol/(s m )) has the lowest activity. |
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2楼2013-03-31 14:24:46
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yingxingwang: 金币+15, 翻译EPI+1, ★★★很有帮助 2013-04-01 18:32:01
yingxingwang: 金币+15, 翻译EPI+1, ★★★很有帮助 2013-04-01 18:32:01
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具体的单位格式你自己修改。 3.3 比表面积对活性的作用 通常，比表面积在催化活性中有重要作用。Liu等人和Schurz等人报道了在环己醇和苄醇的氧化作用中OMS-2催化剂与其比表面积相关。在我们的研究中，比表面积与催化活性趋势并不很好地相符合。例如，有着最大比表面积(58 m /g)的Fe-OMS-2催化剂显示最低活性，而具有相对更小的比表面积(47 m /g)的Cu-OMS-2催化剂展现出最好活性。因此，采用反应比速（Rs），也就是180 °C每单位表面积每秒消耗的DME的量，来消除比表面积的作用[32,33]。根据我们以往的研究，值为下述顺序：Cu-OMS-2 > Ni-OMS-2 > Co-OMS-2 > Fe-OMS-2 > Cr-OMS-2，其与催化活性趋势相符。例如，具有最大Rs (1.50 lmol/(s m ).)的Cu-OMS-2催化剂有最高活性，且具有最小Rs (0.072 lmol/(s m ))的Cr-OMS-2催化剂有最低活性。 |
3楼2013-04-01 12:53:07
