An Ozone-NO Chemiluminescence Method for NO Analysis in Piston and Turbine Engines

Niki, H.; Warnick, A.; Lord, R. R.

doi:10.4271/710072

Cited by 13 publications

(11 citation statements)

References 1 publication

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“…Also listed in this table are the values for m for these species as reported by Matthews et al 12 These values are similar except for Ar and H 2 O. This difference is attributed to the fact that in Matthews' work slopes were obtained by applying linear regression on the group of data reported by Tuttle and Mellor, 26 Maahs, 27 Niki et al, 28 Clyne et al, 11 and Matthews et al, 12 which had different (O3 + O 2 )/sample ratios in the reaction chamber. To a certain extent, these variations in In other words, the indicated [NO] will be about 71 percent of the actual amount present.…”

Section: Relative Quenching Efficienciesmentioning

confidence: 63%

Reducing Interference Effects in the Chemiluminescent Measurement of Nitric Oxides from Combustion Systems

Tidona

Nizami

Cernansky

1988

JAPCA

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Section: Relative Quenching Efficienciesmentioning

confidence: 63%

Reducing Interference Effects in the Chemiluminescent Measurement of Nitric Oxides from Combustion Systems

Tidona

Nizami

Cernansky

1988

JAPCA

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“…This technique was developed in the early 1970s (Fontijn et al 1970;Niki et al 1971;Stedman et al 1972) in the research laboratories of Aerochem and the Ford Motor Company. Chemiluminescence instruments are selective, sensitive, and robust and in widespread use to measure emissions and atmospheric concentrations of NO.…”

Section: J No Xmentioning

confidence: 99%

100 Years of Progress in Gas-Phase Atmospheric Chemistry Research

Wallington

Seinfeld

Barker

2019

Meteorological Monographs

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Remarkable progress has occurred over the last 100 years in our understanding of atmospheric chemical composition, stratospheric and tropospheric chemistry, urban air pollution, acid rain, and the formation of airborne particles from gas-phase chemistry. Much of this progress was associated with the developing understanding of the formation and role of ozone and of the oxides of nitrogen, NO and NO2, in the stratosphere and troposphere. The chemistry of the stratosphere, emerging from the pioneering work of Chapman in 1931, was followed by the discovery of catalytic ozone cycles, ozone destruction by chlorofluorocarbons, and the polar ozone holes, work honored by the 1995 Nobel Prize in Chemistry awarded to Crutzen, Rowland, and Molina. Foundations for the modern understanding of tropospheric chemistry were laid in the 1950s and 1960s, stimulated by the eye-stinging smog in Los Angeles. The importance of the hydroxyl (OH) radical and its relationship to the oxides of nitrogen (NO and NO2) emerged. The chemical processes leading to acid rain were elucidated. The atmosphere contains an immense number of gas-phase organic compounds, a result of emissions from plants and animals, natural and anthropogenic combustion processes, emissions from oceans, and from the atmospheric oxidation of organics emitted into the atmosphere. Organic atmospheric particulate matter arises largely as gas-phase organic compounds undergo oxidation to yield low-volatility products that condense into the particle phase. A hundred years ago, quantitative theories of chemical reaction rates were nonexistent. Today, comprehensive computer codes are available for performing detailed calculations of chemical reaction rates and mechanisms for atmospheric reactions. Understanding the future role of atmospheric chemistry in climate change and, in turn, the impact of climate change on atmospheric chemistry, will be critical to developing effective policies to protect the planet.

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“…63 Since chemiluminescence was not observed in reactions of the bimolecular mixtures of NO, 0 2 , and C3Hs (Figure 2, catalyst present), and the conversion of propane increased from 1% to 99%, and chemiluminescence was observed when 2% NO was added to a mixture of 2% C3H8 and 35% 0 2 at 600 "C (no catalyst), it is likely that the chemiluminescence is due to a promoting effect of nitric oxide on the combustion of propane. The combustion then generates peroxy radicals which can react with NO to form excited NO2 radicals for chain reactions.…”

Section: Discussionmentioning

confidence: 93%

Rate Oscillations and Chemiluminescence in the Selective Catalytic Reduction of NO by Propane over H-ZSM5

Halász¹,

Brenner²,

Shelef³

et al. 1995

J. Phys. Chem.

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The selective catalytic reduction (SCR) of nitric oxide by propane was investigated in the presence of oxygen over a H-ZSMS catalyst. The concentrations of reactants were varied from 0% to 2% NO, 0% to 2% C3H8, and 0% to 35% 02. Reactions were carried out at temperatures from 25 to 600 "C at a space velocity of 9600 h-l. Periodic oscillations were observed in the NO concentrations of products near 400 "C when the feed contained a minimum of 2% NO, 1% C3H8, and 10% 0 2 . Random oscillations and chemiluminescent flashes were observed between 520 and 600 "C. The random oscillations occurred when the feedstock contained 2% NO, 2% C3H8, and 10-35% 0 2 , and the chemiluminescence occurred when the feedstock contained at least 2% NO, 1% C&, and 35% 0 2 . Results suggest that the SCR reaction proceeds via two different reaction pathways below and above 500 "C. The low-temperature reactions are possibly homogeneousheterogeneous processes involving NO2 as the key reactant to form radical surface intermediates. At high temperatures, homogeneous radical reactions involving both NO and NO2 may be rate determining.

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An Ozone-NO Chemiluminescence Method for NO Analysis in Piston and Turbine Engines

Cited by 13 publications

References 1 publication

Reducing Interference Effects in the Chemiluminescent Measurement of Nitric Oxides from Combustion Systems

Reducing Interference Effects in the Chemiluminescent Measurement of Nitric Oxides from Combustion Systems

100 Years of Progress in Gas-Phase Atmospheric Chemistry Research

Rate Oscillations and Chemiluminescence in the Selective Catalytic Reduction of NO by Propane over H-ZSM5

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