Abstract
Redox properties of vanadium phosphorous oxide (VPO) catalysts have been measured using butane and hydrogen as reductants and molecular oxygen as an oxidizing agent. These redox measurements indicate vanadium phosphorous oxide catalysts can vary markedly in oxygen capacity and redox rates. The VPO systems selected for this study range in oxygen carrying capacity from surface oxygen participation only to involvement of subsurface oxygen. The stability of the operative redox chemistry of a VPO catalyst is illustrated by a 30000 cycle butane reduction test. Butane oxidation results in a transport bed reactor are explained by fundamental redox properties of vanadium phosphorous oxide catalysts.
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