hide
Free keywords:
acrylic acid; gelation; oxide; propane; selective oxidation; xerogel
Abstract:
Synthesis of complex oxidation catalysts The cover picture illustrates structure and crystal morphology of two important phases occurring in complex multi-metal oxide catalysts for oxidative activation of small alkane molecules. The desired single-step synthesis of valuable products by selective C-H bond activation involving complex reaction mechanisms and various intermediates gives rise to high demands on the catalyst. Only the MoVTeNb oxide M1 phase on the left side accomplishes the direct oxidation of propane to acrylic acid in one step, while the (Mo,V,Nb)5O14 oxide on the right is rather inactive. In the full paper on p. 495 ff. Y. V. Kolen'ko et al. describe the synthesis of M1 by an acrylamide-gelation approach yielding initially a blue gel. Subsequent microwave-assisted drying and calcination facilitated the formation of M1 nanocrystals with modified properties at unexpected low temperatures.
