Abstract
This work is devoted to the decomposition of gaseous HCN by oxidation with air catalyzed by different nickel containing catalysts. The presence of metallic nickel does not cause the decomposition of cyanide at 400 °C, but NiO, electrochemical prepared nickel oxides Ni2O3·xH2O and (β,γ)-NiOOH exhibit distinctly high catalytic activity at this temperature. The effect of HCN decomposition for electrochemically prepared nickel oxides was over 90 %. Nickel deposited on activated carbon also demonstrated catalytic behavior during the destruction of HCN with an air mixture at the temperature 400 °C. Nickel oxide mixed with activated carbon showed a small increase of catalytic activity in the destruction of HCN in comparison with NiO.
Highlights
Cyanides are discharged by various industries, in metallurgical processes, plating and surface finishing
The decomposition of Hydrogen cyanide (HCN) over nickel powder and nickel foam was investigated. These catalysts were placed in the oxidation reactor and the HCN/air mixture was let through
The confirmation of this phenomenon is my subsequent studies with nickel oxide, which exhibited its catalytic behavior in the oxidation of HCN
Summary
Cyanides are discharged by various industries, in metallurgical processes (extraction of gold and silver), plating and surface finishing. They are considered among the most dangerous compounds for the environment and their toxicity is mainly due to their aptitude to release free cyanides. Hydrogen cyanide (HCN) is a very toxic gas 30 times more toxic than carbon monoxide) that already affects human beings at ppm level in air whereas 1 min of exposure to concentrations of ca. Reac Kinet Mech Cat (2013) 109:57–65 knowledge, there are only a few publications focused on the catalytic decomposition of HCN in the gas phase, as reviewed by Krocher and Elsner [14]. Al2O3 or Pt, Pd, Rh, Ag, V2O5, WO3, CuSO4/TiO2 each supported on TiO2 pellets [15] and Pt/Al2O3 [16] were studied as catalysts in this reaction
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