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| Ru助剂对Co/SiO2催化剂径向结构函数的影响见图。从图可见，加入Ru助剂后，各类样品均在0.151nm处出现Co-O配位峰，在0.248nm、0.302nm处出现Co-Co配位峰，与未加助剂的催化剂的峰位置基本一致，表明催化剂中的钴物种以Co3O4的形式存在。加入Ru助剂后，各催化剂的第二配位层发生了变化。Co/SiO2催化剂在0.480nm处出现第二壳层Co-O配位峰，随着Ru助剂的加入，第二壳层Co-O配位峰的位置前移至0.467nm处。即使Ru助剂的含量增加到9.96%，也没有观察到Co-Ru之间相互作用形成化合物。Ru对钴物种的影响主要是通过电子效应发生作用。 |
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gaohaiyan(金币+30,VIP+0):多谢！！ 10-26 09:52
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| The effect of Ru catalyst on Co/SiO2 radial distribution function is shown in the figure. As can be seen from the figure, by adding Ru additives in various types of samples, there is a Co-O coordination peak at 0.151nm, and Co-Co coordination peaks at 0.248nm and 0.302nm. The agreement with results in the absence of added catalyst additives indicates that the cobalt catalyst is in the form of Co3O4. After adding Ru additives, the catalyst of the second coordination layer has changed. Co/SiO2 catalyst at 0.480nm occurrs at the second coordination shell of Co-O peak, with the Ru additives participation. The second coordination shell of Co-O peak position moves forward at 0.467nm. Even if the Ru content increases to 9.96 percent additive, there is no evidence for the formation of Co-Ru interaction between the compounds. The major impact of Ru on the cobalt species is through electronic effects. |
2楼2009-10-23 23:20:35
