NDLI: Vanadium oxides supported on hydrotalcite-type precursors: the effect of acid-base properties on the oxidation of isopropanol

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Vanadium oxides supported on hydrotalcite-type precursors: the effect of acid-base properties on the oxidation of isopropanol

Content Provider	Scilit
Author	Meira, D. M. Cortez, G. G. Monteiro, W. R. Rodrigues, J. A. J.
Copyright Year	2006
Description	Vanadium oxide supported on hydrotalcite-type precursors was studied in the oxidation of isopropanol. Hydrotalcites with different y = Mg/Al ratios were synthesized by the method of coprecipitation nitrates of Mg and Al cations with K2CO3 as precipitant. The decomposition of these hydrotalcite precursors at 450°C yielded homogeneous MgyAlOx mixed oxides that contain the Al+3 cations totally incorporated into the MgO framework. The materials were characterized by chemical analysis, BET superficial area, X-ray diffraction, temperature-programmed reduction (TPR) and the reaction of isopropanol, a probe molecule used to evaluate the acid-base properties. The results of TPR showed that the reducibility of V+5 decreased with the increase in magnesium loading in catalysts. The X-ray diffraction patterns of Al-rich hydrotalcite precursors showed the presence of crystalline phases of brucite and gibbsite. It was shown that chemical composition, texture, acid-base properties of the active sites and also Mg/Al ratio strongly affect the formation of the products in the oxidation of isopropanol. The Al-rich catalysts were much more active than the Mg-rich ones, converting isopropanol mainly to propylene
Related Links	http://www.scielo.br/pdf/bjce/v23n3/08.pdf
Ending Page	358
Page Count	8
Starting Page	351
ISSN	01046632
e-ISSN	16784383
DOI	10.1590/s0104-66322006000300008
Journal	Brazilian Journal of Chemical Engineering
Issue Number	3
Volume Number	23
Language	English
Publisher	FapUNIFESP (SciELO)
Publisher Date	2006-09-01
Access Restriction	Open
Subject Keyword	Brazilian Journal of Chemical Engineering Environmental Sciences al Catalysts
Content Type	Text
Resource Type	Article
Subject	Chemical Engineering

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