Vanadyl glycolate

The aim of the present work was to develop a preparation for the vanadyl orthophosphate hemihydrate which makes use of glycols as the organic compounds able to affect its morphology these have been used as additional components, besides isobutanol, in the reducing medium. A further aim of the present work was to understand which are the key aspects in the thermal treatment through the control of which is it possible to transfer morphological features of the precursor to the vanadyl pyrophosphate, and thus to finally affect the catalytic performance. 

Dififerent is the case for sanq)le 3, because 1,3-propandiol (Teb 213°C) was transformed to acrolein and propanal already at 150-200°C, and to carbon oxides as well. This means that the glycol h developed some kind of interaction with the precursor, and leaves the latter at tenperatures lower than those of precursor transformation to vanadyl pyrophosphate. Finally, in sanq)le 5 the only product of selective transformation was tetrahydrofiiran (originated by intramolecular condensation of 1,4-butandiol, Teb 230°C), but the existence of a chemical interaction between the glycol and the precursor is demonstrated by the appearance of carbon oxides at around 250°C. These tests demonstrate that even in the absence of air, the precursor is able to oxidize the organic... 

The known effect of organic compounds intercalation in the structure of the vanadyl orthophosphate hemihydrate, in the present case glycols having different number of C atoms used in mixture with isobutanol, has been confirmed. The removal of the retained organic fraction during the thermal treatment may lead either to folly amorphous compoimds, or to confounds which exhibit some peculiar features of the precursor, e.g. a... 

V doped ZnO Zinc (11) acetyl acetonate, vanadyl (IV) acetyl acetonate, ethylene glycol, methyl alcohol... 

About 0.9 mmol of zinc (IE) acetylacetonate hydrate and appropriate quantities of vanadyl (IV) acetylacetonate are dissolved in a 250 mL 1 4 volume mixture of ethylene glycol and methyl alcohol. An ultrasonic bath is used to hasten the dissolution. The contents are stirred for 2 h to get a homogeneous solution. To this, a 5 wt% aqueous solution of polyvinyl alcohol (mol. wt. = 72,000) is added until a viscous gel is produced. The gel is first dried at 273 K for a day followed by calcination at 600°C for 1 h to obtain vanadium doped ZnO nanorods. 

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