摘要:

Using a matrix isolation technique an attempt was made to detect gas phase methyl radicals which had been formed at 500°C on a polycrystalline Pt catalyst dispersed with SiO2, and at 900°C on a Pt single-crystal catalyst. Reaction products were condensed onto a sapphire rod which was then lowered into an EPR microwave cavity for analysis. No increase in the amount of radicals over the background was detected. Thus, the role of the Pt catalyst in the catalytic combustion of methane is to provide a catalytic surface for the reaction of CH4and O2, and not to facilitate the gas phase reaction by generating free radicals.

ISSN:0010-2202    

DOI:10.1080/00102208408923815

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor

摘要:

This note compares recent work on flame size and soot escape. The criteria found for soot escape by various workers arc in reasonable agreement, differing slightly due to different definitions of the end-point. However, the recent statement is incorrect, that the effect of O2concentrations on diffusion flame size disagrees with the theory of Roper. The temperature effect observed is in excellent agreement with this theory. The present work also suggests that buoyancy effects must be included when considering the effects of fuel flowrate on soot escape.

ISSN:0010-2202    

DOI:10.1080/00102208408923816

出版商:Taylor & Francis Group    

年代:1984

数据来源: Taylor