Accession Number : ADA306341

Title :   Catalytic Oxidation of Hydrogen Cyanide Over a Monolithic Oxidation Catalyst.

Descriptive Note : Final rept. Nov 93-Mar 94,

Corporate Author : GEO-CENTERS INC FORT WASHINGTON MD

Personal Author(s) : Rossin, J. A.

PDF Url : ADA306341

Report Date : OCT 1995

Pagination or Media Count : 56

Abstract : The catalytic oxidation of hydrogen cyanide was evaluated over a monolithic oxidation catalyst at temperatures between 220 and 310 deg C in air employing feed concentrations between 200 and 20,000 ppm (241 and 24,100 mg/cu meters). Isothermal reaction rate data were measured by exposing the catalyst to various concentrations of hydrogen cyanide and recording the conversion as a function of residence time. Reaction rate data were correlated using a mathematical model, which took into account external mass transfer resistances and kinetic effects. Data were also recorded under conditions representative of a chemical attack, which were simulated in the laboratory by exposing the catalyst to high concentration pulse challenges of hydrogen cyanide. Catalytic deactivation resulting from the oxidation of hydrogen was insignificant. Reaction products consisted of CO2, N2, N2O, and NOx, with the formation of NOx being favored at high reaction temperatures. The rate of hydrogen cyanide oxidation was highly non-linear in the concentration of hydrogen cyanide, with the reaction rate being inversely proportional to the concentration of hydrogen cyanide at high concentrations. Results of the pulse testing demonstrated that hydrogen cyanide is highly reactive, and that high concentrations of hydrogen cyanide may be completely oxidized at reaction temperatures between 350-375 deg C.

Descriptors :   *OXIDATION, *CATALYSTS, *CATALYSIS, *HYDROGEN CYANIDE, TEST AND EVALUATION, MATHEMATICAL MODELS, TEMPERATURE, HIGH RATE, HIGH TEMPERATURE, RESISTANCE, REACTION TIME, NONLINEAR SYSTEMS, PULSES, CHEMICAL REACTIONS, MASS TRANSFER, CONCENTRATION(COMPOSITION), EXTERNAL, KINETICS, NITROGEN OXIDES, CARBON DIOXIDE, REACTANTS(CHEMISTRY), ISOTHERMS, DEACTIVATION.

Subject Categories : Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE