Alumina-supported hexagonal Kx WO3 phases have been prepared in the presence and absence of Pt; K significantly promotes the chemisorption of nitrogen and Pt the chemisorption of hydrogen thereon. The turnover number for the production of ammonia (molecules of ammonia produced per site capable of chemisorbing hydrogen per second) was very low, but was promoted by K and not Pt. The modes of adsorption and catalysis and the manner of their promotion are considered in detail.
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Stevenson et al. (1987) studied this question.