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北京石油化工學(xué)院2026年研究生招生接收調(diào)劑公告

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yingxingwang

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3.5. Effect of the redox properties on the activity
To further explore the relationship between the redox property and activity, XPS and H2-TPR techniques were conducted. The O 1s spectra of the M-OMS-2 catalysts are shown in Fig. 6, and the results of O 1s peak fittting are in Table 1. For all the catalysts, the O1s peak is composed of three subpeaks at around 530, 531.5 and 533 eV, which can be attributed to the lattice oxygen (Oa),the defect oxide or a hydroxyl-like group (Ob), and the adsorbed molecular water (Oc), respectively [20,37,38]. The amount of the Oa and Ob species were calculated from the relative area of the subpeaks. For each catalyst, the most abundant species is lattice oxygen (Oa), suggesting that lattice oxygen is important for the catalytic activity. The Ob species has higher mobility than the Oa species, and allow the diffusion of lattice oxygen [39,40]. To conﬁrm the contribution of Ob species in the reaction, the area ratios of AOb/AO(b+a) were calculated (Table 1). The AOb/AO(b+a)
values follow the order: Ni-OMS-2≈ Cu-OMS-2 > Co-OMS-2 >Cr-OMS-2 > Fe-OMS-2, which is very similar to the orders of the Rs and AOS values. Kim et al. [39] reported that a defect-oxide or Rs and AOS values. Kim et al. [39] reported that a defect-oxide or a hydroxyl-like group could positively participate in the catalytic activity of VOCs combustion over K, Ca and Mg promoted Mn3O4 catalysts. Wang et al. [41] found that the accessibility was more important than the concentration of catalyst lattice oxygen for ethanol and acetaldehyde oxidation. Therefore, the defect-oxide species in M-OMS-2 catalyst could contribute to the catalytic activities of DME combustion.

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1樓 2013-04-04 22:14:11

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furao

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yingxingwang: 金幣+50, 翻譯EPI+1, ★有幫助, 嗯，那也謝謝了 2013-04-06 13:27:25

3.5氧化還原性對(duì)活性的作用
為了進(jìn)一步探究氧化還原性和活性之間的關(guān)系，采用了XPS和H2-TPR技術(shù)。M-OMS-2催化劑的O-1s譜如圖6，各峰在表1中列出。對(duì)于所有的催化劑，O1s峰都是有三個(gè)亞峰，530、531.5和533eV構(gòu)成，分別對(duì)歸于晶格氧（Oa），缺陷氧化物或氫氧根類似基團(tuán)（Ob）和吸附了的分子水（Oc）。Oa和Ob類的含量是通過計(jì)算亞峰的相對(duì)面積求得的。對(duì)于每個(gè)一催化劑，最多的是Oa，表明Oa對(duì)于催化活性是很重要的。Ob比Oa具有更高的移動(dòng)性，有助于Oa的擴(kuò)散。為了確定反應(yīng)中Ob的作用，計(jì)算了面積比AOb/AO（b+a）（表一）。AOb/AO（b+a）順序是：Ni-OMS-2≈ Cu-OMS-2 > Co-OMS-2 >Cr-OMS-2 > Fe-OMS-2，這種關(guān)系和Rs和AOS的順序非常像。Kim等報(bào)道過缺陷氧或氫氧根類似基團(tuán)能對(duì)于VOCs的氧化反應(yīng)具有更好的催化能力相比于K，Ca和Mg催化MN3O4反應(yīng)。Wang等發(fā)現(xiàn)在乙醇和乙醛的氧化反應(yīng)中，Oa的可接近性比濃度具有更大的重要性。所以，M-OMS-2催化劑中的缺陷氧對(duì)于DME的氧化是有作用的。

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2樓2013-04-05 23:34:18