<b>The Atmospheric Thermal Oxidation of Nitric Oxide</b>

Glasson, William A.; Tuesday, Charles S.

doi:10.1021/ja00902a008

Cited by 68 publications

(43 citation statements)

References 2 publications

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“…Urban air quality is degraded by internal combustion engine exhaust gas emissions, and by more harmful species derived from them via photochemical reactions [2,3]. The main exhaust gas pollutants are hydrocarbons (HCs) and oxidised organic compounds derived from them, CO and NO x .…”

Section: Legislative Requirements and Other Considerationsmentioning

confidence: 99%

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Collins

Twigg

2007

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Exhaust gas emissions from passenger cars with traditional gasoline engines have been markedly reduced over the three decades since the introduction of catalysts. The first oxidation catalysts were superseded by two-catalyst three-way systems that were followed by single three-way catalysts (TWCs). The first Pt/Rh-based TWCs formulations were refined by incorporating increasingly thermally stable ceria-based components to keep the surface composition close to stochiometric during exhaust gas composition fluctuations. Substituting Pd for Pt gave further improvement in some applications, as can zoning catalyst type or loading on a single substrate. Optimisation of cell density, geometric area, and thermal capacity of the substrate provided additional benefits. Modern advanced TWCs are very thermally stable so they can be mounted directly on the exhaust manifold. Here, with a rapid engine start-up strategy catalyst operating temperatures are quickly achieved after the engine is started. As a result extremely low emissions can be achieved, and computer models are used to predict the performance of different catalyst loadings and layouts. This is a powerful tool in the design of TWC systems for new engines/vehicles to predict what will be optimal, and today high performance from relatively very low PGM loadings is possible, in spite of increasingly stringent tailpipe emissions limits and distances over which they must be maintained. Now the performance of TWCs is monitored during actual on road driving, and this is done via measurement of the catalyst oxygen storage capacity.

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Section: Legislative Requirements and Other Considerationsmentioning

confidence: 99%

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Collins

Twigg

2007

Top Catal

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“…The other studies [5-131 cover very narrow temperature ranges; some of them [5,11] are performed under conditions simulating atmospheric pollution (a few parts per million reactants in air at 1 atm); sometimes the experimental method used to measure the partial pressures is rather complicated [6,131. Although some authors [7,91 suggest some possible contribution of heterogeneous reactions, no experimental evidence for such effects has ever been reported.…”

Section: Introductionmentioning

confidence: 99%

Termolecular reaction of nitrogen monoxide and oxygen: A still unsolved problem

Olbregts

1985

Int J of Chemical Kinetics

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The oxidation of nitrogen monoxide has been studied extensively between 226 and 758 K a t pressures of NO and O2 ranging from about 0.2 to 30 torr. It has been shown that (i) the reaction is properly first order against oxygen and second order against nitrogen monoxide, as well under initial conditions as during the course of the reaction;(ii) the termolecular rate constant, k, first decreases with increasing temperature and reaches a minimum value a t 600 K; (iii) the transition state theory is unable to de-

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“…The kinetics of the oxidation of NO in oxygen (O)-N mixtures have been determined by Glasson and Tuesday. 26 The results of their investigation indicate that the reaction is second order in NO, first order in oxygen, and independent of the concentration of added NO 2 , with a third-order rate constant, at 23°C, where k is (1.57 Ϯ 0.09) ϫ 10 Ϫ9 /ppm 2 /min. In the presence of oxygen, the rate of conversion of NO into NO 2 increases as the square of NO concentration increases.…”

Section: Discussionmentioning

confidence: 98%

Abiotic and Biological Mechanisms of Nitric Oxide Removal from Waste Air in Biotrickling Filters

Chen

2006

Journal of the Air & Waste Management Association

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Nitric oxide (NO) may participate in the ozone layer depletion and forming of nitric acid. Abiotic and biological mechanisms of NO removal from waste gases were studied in a biotrickling filter. The abiotic NO removal rate in the biotrickling filter was estimated by a review of the literature. The abiotic and biological removals were also verified in the biotrickling filter. The result has shown that chemical oxidation and bionitrification were both involved in the NO removal. It was found that the NO removal in high concentration (ϳ1000 ppm or higher) was in large measure the result of abiotic removal in both gas-phase and liquid-phase reactions. When NO concentration is low (less than ϳ100 ppm), bionitrification was the main process in the NO removal process in the biotrickling filter.

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The Atmospheric Thermal Oxidation of Nitric Oxide

Cited by 68 publications

References 2 publications

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Three-way catalyst emissions control technologies for spark-ignition engines—recent trends and future developments

Termolecular reaction of nitrogen monoxide and oxygen: A still unsolved problem

Abiotic and Biological Mechanisms of Nitric Oxide Removal from Waste Air in Biotrickling Filters

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