THERMAL-PROPERTIES OF PYRIDINIUM AND IMIDAZOLIUM HEXAVANADATES

The thermal decomposition of pyridinium (PyH) and imidazolium (ImH) he xavanadates, (PyH)2V6O16 . H2O and (ImH)2V6O16 . H2O, was studied by d ynamic methods. The decomposition is influenced by the properties of t he cation. PyH, which is thermally more stable, gives rise to the (PyH )HV6O16 intermediate at 275-degrees-C which is then decomposed at 420- degrees-C to a V2O5-V3O7 mixture. ImH is successively decomposed from 200-degrees-C and urea is formed as one component of the decomposition product. Vanadium pentoxide is the final decomposition product of bot h hexavanadates.