abstract |
The present invention relates to a method of treating a mixed metal oxide catalyst containing molybdenum, vanadium, niobium and optionally tellurium comprising allowing a gas stream comprising methane, an inert gas or oxygen or any combination of two or more of these Contacting with the catalyst wherein the gas stream comprises 0 to 25% by volume of alkanes containing 2 to 6 carbon atoms and/or olefins containing 2 to 6 carbon atoms. |