The role of gaseous and surface isocyanates in the reaction of mixtures of H2, NO and CO over supported platinum catalysts

Ralf Dümpelmann; Noel W. Cant; Andrew D. Cowan

The role of gaseous and surface isocyanates in the reaction of mixtures of H2, NO and CO over supported platinum catalysts

Ralf Dümpelmann, Noel W. Cant, Andrew D. Cowan

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Abstract

Two aspects of the reactions of mixtures of H₂, NO and CO over supported Pt catalysts have been investigated in detail. With Pt/SiO₂ isocyanic acid, HNCO, is a substantial gaseous product over a wide range of conditions. Its formation persists with O₂ also present provided the concentration of unreacted CO is sufficient to populate the Pt surface. Added water causes some loss of HNCO due to hydrolysis. With Pt/Al₂O₃ the rate of hydrolysis is so fast that no HNCO is seen. Combined in situ FTIR and isotope transient measurements show that this hydrolysis occurs largely through the intermediate formation of surface NCO groups on the alumina component of the catalyst.

Original language	English
Pages (from-to)	1175-1184
Number of pages	10
Journal	Studies in Surface Science and Catalysis
Volume	101 B
Publication status	Published - 1996

Cite this

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AU - Dümpelmann, Ralf

AU - Cant, Noel W.

AU - Cowan, Andrew D.

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N2 - Two aspects of the reactions of mixtures of H2, NO and CO over supported Pt catalysts have been investigated in detail. With Pt/SiO2 isocyanic acid, HNCO, is a substantial gaseous product over a wide range of conditions. Its formation persists with O2 also present provided the concentration of unreacted CO is sufficient to populate the Pt surface. Added water causes some loss of HNCO due to hydrolysis. With Pt/Al2O3 the rate of hydrolysis is so fast that no HNCO is seen. Combined in situ FTIR and isotope transient measurements show that this hydrolysis occurs largely through the intermediate formation of surface NCO groups on the alumina component of the catalyst.

AB - Two aspects of the reactions of mixtures of H2, NO and CO over supported Pt catalysts have been investigated in detail. With Pt/SiO2 isocyanic acid, HNCO, is a substantial gaseous product over a wide range of conditions. Its formation persists with O2 also present provided the concentration of unreacted CO is sufficient to populate the Pt surface. Added water causes some loss of HNCO due to hydrolysis. With Pt/Al2O3 the rate of hydrolysis is so fast that no HNCO is seen. Combined in situ FTIR and isotope transient measurements show that this hydrolysis occurs largely through the intermediate formation of surface NCO groups on the alumina component of the catalyst.

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M3 - Article

AN - SCOPUS:33750679266

SN - 0167-2991

VL - 101 B

SP - 1175

EP - 1184

JO - Studies in Surface Science and Catalysis

JF - Studies in Surface Science and Catalysis

ER -

The role of gaseous and surface isocyanates in the reaction of mixtures of H2, NO and CO over supported platinum catalysts

Abstract

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