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• W2044464293 abstract "Location of reproducible conditions for ignition, chemiluminescence (glow) and oscillatory behaviour in carbon monoxide oxidation is a classic unsolved problem. The present paper is primarily concerned with locating and distinguishing between the non-oscillatory instabilities (ignition and glow); subsequent parts will deal with oscillatory behaviour in closed and open systems and with the unifying mechanism. We use a clean, acid-washed, quartz vessel in the region of the second limit. Emphasis is placed on: (i) the behaviour of a range of compositions little studied hitherto and containing from 2000 to 200 x 10 -6 of added H 2 , intermediate between ‘wet’ mixtures (which are easy to study) and ‘dry’ mixtures (which are notoriously difficult to study); and (ii) continuous monitoring of reactions by mass spectrometry and continuous, instrumental records of light intensity, temperature and pressure. Ignitions are sudden and intense; reaction is complete and temperature rises are large. Chemiluminescence is more variable: it can be bright enough to be mistaken visually for ignition, but quantitative measurements show it to be less sudden and less intense; reaction is always incomplete and accompanying temperature rises are smaller, and may be imperceptible. Behaviour depends crucially upon the amount of added hydrogen. In ‘wet’ mixtures containing more than 2000 x 10 -6 H 2 , only slow reaction and ignition occur. Intermediate mixtures (2000 x 10 -6 to 200 x 10 -6 H 2 ) display chemiluminescence also, but as the ‘dryness’ increases, the temperatures required for ignition rise so sharply that this mode becomes difficult to attain. In dry mixtures (200 x 10 -6 to 50 x 10 -6 or less), ignition is quite inaccessible. The boundaries established in classic work by Linnett and by Gordon relate to luminescence, not ignition. A novel, pulsed glow (distinguished from oscillatory chemiluminescence), induced by continued heating of the reaction vessel, is also reported here. Classical simple treatments of instabilities begin from chain-branching or thermal standpoints: they are often thought to be mathematically similar but physically different. Attention is drawn here to the sharp differences implicit in the treatments. Both are needed in the subsequent development." @default.
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• W2044464293 date "1981-02-18" @default.
• W2044464293 modified "2023-10-14" @default.
• W2044464293 title "Oscillations, glow and ignition in carbon monoxide oxidation - I. Glow and ignition in a closed reaction vessel and the effect of added hydrogen" @default.
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• W2044464293 doi "https://doi.org/10.1098/rspa.1981.0039" @default.
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