Accession Number : AD0722290

Title :   High-Temperature Photolysis and the Pyrolysis of Formamide Vapour, and the Thermal Decomposition of the Carbamyl Radical,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF CHEMISTRY

Personal Author(s) : Back,R. A. ; Boden,J. C.

Report Date : 23 MAR 1970

Pagination or Media Count : 11

Abstract : The photolysis of formamide vapour has been studied at temperatures from 262 to 500C, at formamide pressures ranging from 6 to 33 Torr. A radical-chain reaction was observed, yielding CO and NH3 in equal amounts. It was concluded that the chain was initiated by photodissociation of formamide. The kinetics of this chain reaction were examined, including its dependence on temperature, light intensity, formamide pressure, and pressure of added inert gas. Under suitable conditions, the decomposition of the carbamyl (NH2CO) radical was rate controlling. It was also pressure dependent, and limiting high and low pressure Arrhenius expressions were obtained for the rate constant. A relatively slow thermal decomposition of formamide vapour accompanied the photolysis, yielding CO and NH3 as major products and H2 as a minor one. Rates of production of CO and H2 were approximately first-order in formamide pressure. This decomposition is probably a surface reaction. (Author)

Descriptors :   (*FORMAMIDES, *PHOTOLYSIS), (*PYROLYSIS, FORMAMIDES), DECOMPOSITION, GASES, CARBON MONOXIDE, AMMONIA, REACTION KINETICS

Subject Categories : Organic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE