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yingxingwang銀蟲 (小有名氣)
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3.4. Effect of average oxidation state (AOS) on the activity The AOS of OMS-2 catalyst is usually determined by potentio-metric titration method [34] or by the XPS analysis of Mn 3s [35,36]. Herein, the AOS was calculated from the corresponding formula using the result from the ICP-AES analysis (Table 2). It can be seen from Table 2 that the AOS value of the OMS-2 catalyst (3.91) in our study is in agreement with that (3.9) of the reported OMS-2 [35], suggesting that this method is reasonable. The AOS values of the M-OMS-2 increase after doping with transition metals. The AOS values decrease in the following order: Cu- OMS-2 > Ni-OMS-2 > Co-OMS-2 > Cr-OMS-2 > Fe-OMS-2, which is very similar to the decreasing order of the Rs values. Xia et al.[34] observed that the higher AOS lead to higher CO oxidation rates over the Cu(Co, Ag)-OMS-2 catalysts. Santos et al. [35] also found that the OMS-2 with the highest AOS showed the best catalytic activity for the total oxidation of ethyl acetate. Therefore, it could be concluded that the AOS values of the M-OMS-2 catalysts are in correlation with their catalytic activities of DME combustion. |
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hanches
鐵桿木蟲 (正式寫手)
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【答案】應(yīng)助回帖
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感謝參與，應(yīng)助指數(shù) +1
yingxingwang: 金幣+30 2013-04-08 18:42:56
感謝參與，應(yīng)助指數(shù) +1
yingxingwang: 金幣+30 2013-04-08 18:42:56
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平均氧化度對催化活性的影響 OMS-2催化劑的平均氧化度通常用電位滴定法 [34] 或Mn 3s 的XPS分析法 [35,36]測定。這里，利用ICP - AES分析的結(jié)果（表2）經(jīng)相應(yīng)公式計算得到AOS值。從表2可以看出，我們研究的OMS-2催化劑的AOS值和已有報道的OMS-2 [35]的值一致，這表明該方法是可靠的。摻雜過渡金屬后，M-OMS-2 的AOS值增大。AOS值降低的大小順序為：Cu-OMS-2 > Ni-OMS-2 > Co-OMS-2 > Cr-OMS-2 > Fe-OMS-2，這和Rs值的降低順序一致。Xia等注意到AOS越高，使其CO氧化率高于 Cu(Co, Ag)-OMS-2催化劑更多。Santos 等也發(fā)現(xiàn)，高AOS值的OMS-2對乙酸乙酯的完全氧化催化活性更強。因此，可以推斷，M-OMS-2催化劑的AOS值大小與它們對DME氧化的催化活性高低一致。 |
2樓2013-04-08 16:41:38
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