NDLI: Catalytic selective oxidation of isobutane over Csx(NH4)3−xHPMo11VO40 mixed salts

Content Provider	Royal Society of Chemistry (RSC)
Author	Paul, Sébastien Katryniok, Benjamin Bordes-Richard, Elisabeth Jing, Fangli Dumeignil, Franck
Copyright Year	2014
Abstract	A series of mixed Keggin-type heteropolysalts Csx(NH4)3−xHPMo11VO40 with various ammonia/caesium ratios was prepared by the precipitation method and characterized by TGA, N2 adsorption/desorption, XRD, FT-IR, and NH3-TPD techniques. Correlations between the ammonia/caesium ratio and the specific surface area, as well as with the total number of acid sites, were established. Furthermore, the introduction of Cs to the catalytic formulation was beneficial to the stabilization of the Keggin structure and helped limiting the elimination of the V atoms from the primary structure. The as-prepared samples were applied in the catalytic selective oxidation of isobutane at 340 °C under atmospheric pressure. The best results were obtained over Cs1.7(NH4)1.3HPMo11VO40 with an isobutane conversion of 9.6% and a total selectivity to valuable products (methacrylic acid and methacrolein) of 57.1%. This was explained by the well-balanced acidity and specific surface of this catalyst, promoting the C–H bond activation (adequate acid properties) over a large number of accessible active sites (high acid sites density).
Starting Page	2938
Ending Page	2945
Page Count	8
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c4cy00518j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	X-ray crystallography Ammonia Acid Adsorption Atmospheric pressure Chemical bond Methacrolein Caesium Specific surface area Fourier-transform infrared spectroscopy Isobutane Keggin structure
Content Type	Text
Resource Type	Article
Subject	Catalysis

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