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yingxingwang銀蟲 (小有名氣)
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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樓2013-03-31 14:24:46
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
yingxingwang: 金幣+15, 翻譯EPI+1, ★★★很有幫助 2013-04-01 18:32:01
yingxingwang: 金幣+15, 翻譯EPI+1, ★★★很有幫助 2013-04-01 18:32:01
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具體的單位格式你自己修改。 3.3 比表面積對(duì)活性的作用 通常，比表面積在催化活性中有重要作用。Liu等人和Schurz等人報(bào)道了在環(huán)己醇和芐醇的氧化作用中OMS-2催化劑與其比表面積相關(guān)。在我們的研究中，比表面積與催化活性趨勢并不很好地相符合。例如，有著最大比表面積(58 m /g)的Fe-OMS-2催化劑顯示最低活性，而具有相對(duì)更小的比表面積(47 m /g)的Cu-OMS-2催化劑展現(xiàn)出最好活性。因此，采用反應(yīng)比速（Rs），也就是180 °C每單位表面積每秒消耗的DME的量，來消除比表面積的作用[32,33]。根據(jù)我們以往的研究，值為下述順序：Cu-OMS-2 > Ni-OMS-2 > Co-OMS-2 > Fe-OMS-2 > Cr-OMS-2，其與催化活性趨勢相符。例如，具有最大Rs (1.50 lmol/(s m ).)的Cu-OMS-2催化劑有最高活性，且具有最小Rs (0.072 lmol/(s m ))的Cr-OMS-2催化劑有最低活性。 |
3樓2013-04-01 12:53:07
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