Abstract
FIELD-EMISSION microscopy was applied to the investigation of the mechanism of the catalysed synthesis of ammonia on tungsten. It was concluded from the result that (1) the dissociative adsorption of nitrogen is considerably accelerated by the presence of hydrogen, and that (2) the rate-determining step of the synthesis is either the formation of adsorbed imino-group NH(a) from adsorbed nitrogen atom N(a) and hydrogen atom H(a), or that of adsorbed amino-group NH2(a) from NH(a) and H(a) but not the dissociative adsorption of nitrogen, as is generally accepted.
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