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- W2035289301 abstract "The formation of HNCO and NH4OCN was studied over unsupported Pd, Ir, and Pt-10% Rh catalysts. The reactions studied are 2NO + 3CO + 2H2 → NH4OCN + 2CO2, 2NO + 4CO + H2 → 2HNCO + 2CO2, and 2NO + 2NH3 + 4CO + H2 → 2NH4OCN + 2CO2. The yields of NH4OCN in the first reaction were 97% for the Pt-10% Rh catalyst. The best yield of HNCO in the second reaction was 75% over the Ir catalyst, with an additional 22% of the NO reacting according to the first reaction, for an overall NO → NCO conversion of 86%. The third reaction was carried out with a yield of 86% over Pt-10% Rh. These reactions may be attractive synthetic routes to ammonium cyanate, or its isomer urea, and to isocyanic acid or its trimer isocyanuric acid. The effects of H2O and H2 in the inlet gas of the reaction were found to depend on the temperature and on the H2OH2 ratio. The results were explained by a reaction scheme which places central importance on the adsorbed NCO intermediates. Hydrogenation and hydrolysis of NCO are shown to lead to HNCO and NH3. It is argued that the mechanistic reaction scheme presented accounts for the observed product distributions for Pt, Rh, Ru, Os, and Cu-Ni in addition to Pd, Ir, and Pt-10% Rh." @default.
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- W2035289301 date "1978-09-01" @default.
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- W2035289301 title "Conversion of NO to isocyanic acid and ammonium cyanate over Pd, Ir, and Pt-10% Rh catalysts" @default.
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- W2035289301 doi "https://doi.org/10.1016/0021-9517(78)90049-0" @default.
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