High pressure study of H oxidation and its interaction with NO

Colom-Díaz, J.M.; Millera, Ángela; Bilbao, Rafael; Alzueta, María U.

doi:10.1016/j.ijhydene.2019.01.078

Cited by 9 publications

(9 citation statements)

References 44 publications

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“…The oxidation of DMC at high pressure was performed in an experimental set-up, which has been used successfully in a series of previous works of our research group (Thermochemical Process Group -GPT, University of Zaragoza), addressing high pressure gas-phase reactions [e.g. [40][41][42][43].…”

Section: Experimental Methodologymentioning

confidence: 99%

Experimental and simulation study of the high pressure oxidation of dimethyl carbonate

Alexandrino

Millera

Bilbao

et al. 2022

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Section: Experimental Methodologymentioning

confidence: 99%

Experimental and simulation study of the high pressure oxidation of dimethyl carbonate

Alexandrino

Millera

Bilbao

et al. 2022

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“…Besides, the present mechanism has been updated with some reactions from recent studies. For example, the H 2 /O 2 reaction subset, which is important for the radical pool composition, has been taken from the examination at high pressures of H 2 oxidation and its interaction with NO [34]. New subsets have been added from the study of Gersen et al [23], about CH 4 /H 2 S oxidation at high pressures, where the peroxides CH 3 OO and CH 3 OOH chemistry was found to be important at high pressures and low temperatures, based on previous studies from the same group about CH 4 oxidation at high pressures [24,45].…”

Section: Kinetic Modelmentioning

confidence: 99%

“…In this context, this work addresses the conversion of CH 4 /H 2 S mixtures at different pressures, from atmospheric to 41 bar, analyzing the influence of temperature (500-1050 K) and for different oxygen concentrations, which results in different stoichiometry conditions, both global and/or individual for either CH 4 and H 2 S. The study includes both experiments performed in two different tubular flow reactors, which have been used in different works [29][30][31][32][33][34], and a kinetic modeling study for analyzing the conversion of the CH 4 /H 2 S mixtures considered. These results would be useful for analyzing the conventional combustion of natural sour gas, but also for the combustion of biogas [19], the Claus process [35] or oxy-combustion of the sour gas [13][14][15]36].…”

Section: Introductionmentioning

confidence: 99%

Study of the conversion of CH4/H2S mixtures at different pressures

Colom-Díaz

Leciñena

Peláez

et al. 2020

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Due to the different scenarios where sour gas is present, its composition can be different and, therefore, it can be exploited through different processes, being combustion one of them. In this context, this work deals with the oxidation of CH 4 and H 2 S at different pressures and under a wide variety of conditions. The oxidation has been evaluated experimentally in two different flow reactor setups , one working at atmospheric pressure and another one operating from atmospheric to high pressures (40 bar). Different CH 4 /H 2 S mixtures have been tested, together with different oxygen concentrations and in the temperature range of 500-1400 K. The experimental results obtained show that the oxidation of the CH 4 /H 2 S mixtures is shifted to lower temperatures as pressure increases, obtaining the same trends at atmospheric pressure in both experimental setups. H 2 S oxidation occurs prior to CH 4 oxidation at all conditions, providing radicals to the system that promote CH 4 oxidation to lower temperatures (compared to neat CH 4 oxidation). This effect is more relevant as pressure increases. H 2 S oxidation is inhibited by CH 4 at atmospheric pressure, being more noticeable when the CH 4 /H 2 S ratio is higher. At higher pressures, the H 2 S conversion occurs similarly in the absence or presence of CH 4. The experimental results have been modeled with an updated kinetic model from previous works from the literature, which, in general, matches well the experimental trends, while some discrepancies between experimental and modeling results at atmospheric pressure and 40 bar are found in the conversion of H 2 S and CH 4 .

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“… 4 The conversion process is reversed as a result of photolytic reaction when NO 2 changes to NO in the presence of sunlight as a catalyst. 5 , 6 The oxidation–photolysis process continues until equilibrium is reached according to the chemical process represented in Equation 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Nitrogen dioxide, whose presence in the atmosphere causes horizontal visibility reduction, is quite active in the production of tropospheric ozone leading to a smog problem in the urban atmospher. 6 This occurs early in the morning when vehicle emissions are trapped and mixed with fog close to the ground surface due to shallow boundary layer depth. 7 Nitrogen dioxide dissolves in rainwater through a chemical process to form nitrous acid and nitric acid causing damage to roofing sheets and sculptures.…”

Section: Introductionmentioning

confidence: 99%

Satellite Observation of Spatio-temporal Variations in Nitrogen Dioxide over West Africa and Implications for Regional Air Quality

Oluleye

2021

Journal of Health and Pollution

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Background. Nitrogen dioxide (NO2) is known to affect human health, causing heart and cardiovascular diseases, and it has been shown that locations with long term NO2 pollution recorded a high number of fatalities due to the COVID-19 pandemic. There are no ground stations monitoring emissions of NO2 over West Africa. The present study aimed to use satellite observations to examine pollutant trends over this region. Objective. To examine the trend of NO2 over the entire West Africa sub region in relationship to contributions to environmental emissions using satellite-derived data. This enables the assessment of West Africa regional air pollution hot spots in relationship to enhancing atmospheric factors. The results from this study will also be useful guidance for setting air quality standards for air pollution controls to minimize health hazards. Methods. The present study examined thirteen years of average monthly values of nitrogen dioxide (NO2) to determine the spatio-temporal variation of this pollutant over West Africa. Satellite data for NO2 between 2005 and 2017 were used to determine the variation in pollution levels over West Africa. Correlations between NO2 and meteorological variables (wind speed, rainfall and air temperature) were obtained to explain the influence of West African weather on the region's pollution accumulation. Results. The present study observed that NO2 concentrations varied from place to place and from season to season. Nitrogen dioxide concentrations during the dry season were higher (sometimes 200% higher) than values observed in the wet season which ranged between 0.5 and 6×1015 molec/cm2. Nitrogen dioxide north-south oscillation during the course of a year is largely controlled by the inter-tropical discontinuity (ITD) zone as high concentrations of NO2 are found in the vicinity of the ITD where wind speeds and horizontal vorticity approaches zero. Correlation analysis between NO2 and some atmospheric variables indicated NO2 concentrations are well influenced by atmospheric variables showing bipolar signals depending on the season. An increasing trend of NO2 was also found over selected cities of the region. This indicated that regional air quality is gradually deteriorating. Conclusions. The implications of worsening regional air quality were examined in the light of the prevailing COVID-19 pandemic. The dominant atmospheric factor determining pollution episodes in the region is the inter-tropical discontinuity line which marks the meeting point between the two wind regimes over the region. Densely populated areas are characteristically prone to elevated pollution and have experienced high fatalities during the COVID-19 pandemic. Competing Interests. The authors declare no competing financial interests.

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High pressure study of H oxidation and its interaction with NO

Cited by 9 publications

References 44 publications

Experimental and simulation study of the high pressure oxidation of dimethyl carbonate

Experimental and simulation study of the high pressure oxidation of dimethyl carbonate

Study of the conversion of CH4/H2S mixtures at different pressures

Satellite Observation of Spatio-temporal Variations in Nitrogen Dioxide over West Africa and Implications for Regional Air Quality

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