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- W3143990102 abstract "Mo/MCM 22 is a new type catalyst for methane dehydro aromatization in the absence of oxygen, over which methane can be converted to aromatics with high benzene selectivity and catalytic stability. In this topic, we mainly discuss the promotional effect by the addition of Co to the Mo/MCM 22 catalyst as the second component. It suggests that different steeping methods have different affection to the catalyst. Coimpregnating Co and Mo ((Co,Mo)/MCM 22) results in better catalytic activity while first dipping with Mo and second with Co (Co Mo/MCM 22) results in better catalytic stability with a Co/Mo atomic ratio of 0 2. X ray diffraction results indicate that the CoO and MoO 3 can be highly distributed on the MCM 22 zeolite and their loadings weaken the zeolite's X ray diffraction peak intensity. The coke that forms at low space velocity is mainly the graphitic type coke and that forms at high space velocity is mainly the pre graphitic type one, which plays a key role to the catalytic deactivation. Thermogravimetric studies show that there is mainly two types of coke on the catalysts. The easy burning coke is the main type coke which leads to the catalytic deactivation and the hard burning coke has no effect on the catalytic deactivation. Hard burning coke may be a heavy hydrocarbon type coke that locates in the zeolite's large cages." @default.
- W3143990102 created "2021-04-13" @default.
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- W3143990102 date "2001-01-01" @default.
- W3143990102 modified "2023-09-25" @default.
- W3143990102 title "Methane Dehydro-Aromatization over Co-Modified Mo/MCM-22 Catalysts in the Absence of Oxygen and Coke Deposition" @default.
- W3143990102 hasPublicationYear "2001" @default.
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