Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia

Chem. J. Chinese Universities

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Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia

ZHOU Guang-Dong^1,2, HAN Yang¹, LIU Jie¹, LI Li-Min³, ZHEN Kai-Ji¹, WANG Hai-Shui², CHENG Tie-Xin¹

1. College of Chemistry, Jilin University, Changchun 130021, China;
2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China;
3. Faculty of Chemistry, Northeast Normal University, Changchun 130024, China

Received:2006-04-22 Revised:1900-01-01 Online:2007-02-10 Published:2007-02-10
Contact: CHENG Tie-Xin

Abstract

Abstract: MgO supported copper salt of molybdovanadophosphoric acid H₄PMo₁₁VO₄₀ catalysts were prepared in alcohol by impregnation and the carbon deposition over these catalysts during the n-hexanol oxidation reaction was studied. The coke predominantly deposited on the catalyst surface in the form of CH_x, and it was not found that it caused the deactivation of the catalyst. The XRD, IR, XPS characterizations reveal that the Keggin structure of the CPMV was unaffected by carbon deposition. Moreover, it was shown that the supported CPMVs over the MgO surface can be beneficial to eliminate the coke. The temperature programmed oxidation(TPO) study showed that coke was formed over the catalyst on two different sites: (1) deposited on the CPMVs which can be burn off at a low temperature; (2) deposited on the MgO which could only be removed at higher temperature. The coke content reached constant with the reaction time increasing.

Key words: Carbon deposition, Heteropoly acid, Magnesia, Supported-load

CLC Number:

O643

TrendMD:

ZHOU Guang-Dong^1,2, HAN Yang¹, LIU Jie¹, LI Li-Min³, ZHEN Kai-Ji¹, WANG Hai-Shui², CHENG Tie-Xin¹. Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia[J]. Chem. J. Chinese Universities, doi: .

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Carbon Deposition Behavior over Copper Salts of Molybdovanadophosphoric Acid Catalyst Supported by Magnesia

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