Catalyst for oxidation of ammonia in nitric acid prodn. - contg. metal network carrying metal catalyst, pref. platinum

摘要

Catalyst contains a fine mesh of pure metal (pref. Ni) as a carrier, covered with an intermediate ductile layer of noble metal (pref. 2-5 mu Au), and topped by a layer of a metal catalyst (pref. Pt). Pref. the Ni mesh has pref. hexagonal apertures, and the Ni should not contain 0.002 wt.% S. The coatings are applied galvanically. The catalyst can withstand fluctuating mechanical changes and high temps. Platinum losses are diminished.