Abstract
A kinetic study was conducted for hydrolysis and oxidation of HCN over limestone at 1123 K with a fixed bed reactor. In the absence of O 2 , HCN was hydrolyzed to mainly NH 3 . However, the reaction rate of hydrolysis was far lower than that of oxidation. In the presence of O 2 at concentrations higher than 0.5%, oxidation of HCN was dominant and most of HCN was oxidized to NO, while only a small amount of NH 3 was produced. Conversion of HCN to N 2 O for oxidation over limestone was far lower than the conversions which had been reported for homogeneous oxidation of HCN
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