In a technical scale Tungsten trioxide is almost exclusively manufactured by calcination of APT under oxidizing conditions (in air), W03 is one of the most important, highly pure intermediates for the production of other tungsten compounds and tungsten metal powder. In the latter application it was substituted to a large extent by tungsten by tungsten blue oxide. Because of its bright yellow colour it is us e d as a pigment in oil and water colours. It is employed in a wide variety of catalysts, most recently in catalysts for the control of air pollution and industrial hygiene (DeNOx).
Tungsten trioxide particles are pseudomorphous to APT; that means the particles have the same shape and size as the former APT crystal s, but consist of very small W03 grains.
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