Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TABRIZ)   FALL 2008 , Volume 36 , Number 2 (54) MECHANICAL ENGINEERING; Page(s) 65 To 71.
 
Paper: 

PREPARATION AND OPTIMIZATION OF VPO CATALYSTS

 
Author(s):  ALAVI S.M., GHADIR M.
 
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Abstract: 
Vanadium-phosphorus oxides (VPO) are the most widely used catalysts for the selective oxidation of butane and n-butane to maleic anhydride.
In the present study the vanadium-Phosphorus-Oxide (VPO) catalysts with different p/v atomic ratio and different reflux time were prepared using alcohol based preparation procedures.
The effect of reduction agents (benzyl alcohol or allyl alcohol) and calcinations atmosphere (air or pure oxygen) were investigated. A comparative study has been conducted between promoted VPO catalysts (with molybdenum) and un-promoted VPO catalysts. Effects of PN atomic ratio, reflux time and calcinations atmosphere on crystalline structure were studied. In addition effects of PN atomic ratio, reflux time, reduction agent and presence of promoter on surface area, reduction temperature and active sites were interpreted. The catalysts have been characterized by X-Ray diffraction (XRD) spectroscopy, Fourier Infrared Spectroscopy (FTIR), BET, SEM and ammonia TPD study.
Prepared catalysts were found to be effective for the oxidation of n-butane to maleic anhydride (MA). With the addition of Mo promoter, high n-butane selectivity to maleic anhydride (98%) was observed at 425oC.
 
Keyword(s): VPO CATALYST, MALEIC ANHYDRIDE, PROMOTER, N-BUTANE
 
References: 
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