Abstract
The processes accompanying the preparation of vanadia, molybdena and vanadia-molybdena catalysts by the thermal decomposition of appropriate simple or complex oxalates were studied using DTA and TG methods, IR spectroscopy and X-ray analysis. The complex oxalates of vanadium and molybdenum decompose into VO2 and MoO2, which are subsequently oxidized at 500° in air to V2O5 and MoO3. Theβ-phase of ammonium vanadia-molybdena bronze in the samples containing both metals was thermally stable and did not decompose after 2 h of heating at 400°.
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