催化作用
结晶度
无定形固体
煅烧
化学
氧化物
透射电子显微镜
相(物质)
无机化学
部分氧化
多相催化
化学工程
结晶学
有机化学
工程类
作者
K. Ruth,R. Kieffer,R. Burch
标识
DOI:10.1006/jcat.1998.1975
摘要
A mixed oxide catalyst for the selective oxidation of ethane to ethene and acetic acid, and having the composition Mo(73)V(18) Nb(9)O(x) was prepared and characterised. The crystalline phases found were Mo6V9O40, Mo3Nb2O11, and MoO3; the amorphous part was shown to mainly have the composition Mo(84±3)V(13±3) Nb(2±0.5)O(x). The crystallinity was found to be very sensitive to the calcination temperature in the range 400 to 500°C, where a large part of the amorphous phase is transformed into the crystalline phases given above. The crystalline phases found in the catalyst were prepared separately in pure form, as were additional selected phases from the oxidic system Mo–V–Nb. Analytical transmission electron microscopy was used to determine the contribution of the different phases in the catalyst to the total surface area. It appears that the amorphous phase, shown to consist of small grains (diameter≊10 nm) and, thus, to have a high surface area, may dominate the properties of the catalyst.
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