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Vanadium-containing H 6+x P 2 Mo 18−x V x O 62 (x=0, 1, 2, and 3) Wells-Dawson heteropolyacid (HPA) catalysts were prepared for use in the oxidative dehydrogenation of isobutyric acid (IBA) to methacrylic acid (MAA). Vanadium-containing H 3+x PMo 12−x V x O 40 (x=0, 1, 2, and 3) Keggin HPA catalysts were also...
Acid strength of H3PWxMo12−xO40 (x = 0, 3, 6, 9, and 12) Keggin heteropolyacid (HPA) and H6P2WxMo18−xO62 (x = 0, 3, 9, 15, and 18) Wells-Dawson HPA catalysts was determined by NH3-TPD measurements. Desorption peak temperature (acid strength) of H3PWxMo12−xO40 and H6P2WxMo18−xO62 catalysts showed the same trend with respect to tungsten substitution, and increased with increasing tungsten...
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