Catalytic reduction of nitric oxide in low concentration high velocity gas streams

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Abstract
A catalytic micro‐reacting system and a gas chromatographic analytical method were used to investigate the effectiveness of metal alloys in the catalytic reduction of nitric oxide by hydrogen. Oxidative pretreatment significantly increased the catalytic activity. The rate of nitric oxide removal was directly proportional to hydrogen concentration but independent of nitric oxide concentration. Temperatures were 378 — 500°C, space velocities 42,000 — 54,000 hr−1 and hydrogen and nitric oxide concentrations 400 — 55,000 ppm and 600 — 6,800 ppm, respectively. The data support a mechanism involving adsorbed nitric oxide and hydrogen molecules, the rate determining step being the collision of the latter with the catalyst surface. Some selectivity towards nitric oxide reduction in the presence of oxygen was observed.
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