Reaction Behaviors and Crystal Transformation of Industrial Vanadium-Phosphorus-Oxygen (VPO) Catalysts for <i>n</i>-Butane Oxidation.

Therefore, the fact that the activity of n -butane oxidation showed an increasing trend in our experiment should also be associated with the increasing percentage of V 5+ in the VPO catalyst.

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The selectivity of the MA product presented a decreasing trend during the long-time evaluation, which should be caused by the loss of Lat-O species. 4 Conclusions An industrial VPO catalyst was evaluated for a long time.

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