A DRIFTS study of the heterogeneous reaction of NO2 with carbonaceous materials at elevated temperature

Muckenhuber, H.; Grothe, Hinrich

doi:10.1016/j.carbon.2006.09.019

Cited by 72 publications

(53 citation statements)

References 31 publications

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“…It has been shown that the oxidation of soot by NO 2 occurs at typical exhaust temperature of diesel engines (250-400ºC) [2,[6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Giménez-Mañogil¹,

Garcı́a-Garcı́a²

2015

Fuel Processing Technology

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The aim of this paper is to study the activities of ceria-zirconia and copper/ceriazirconia catalysts, comparing with a commercial platinum/alumina catalyst, for soot combustion reaction under different gas atmospheres and loose contact mode (simulating diesel exhaust conditions), in order to analyse the kinetics and to deduce mechanistic implications.Activity tests were performed under isothermal and TPR conditions. The NO oxidation to NO 2 was studied as well. It was checked that mass transfer limitations were not influencing the rate measurements. Global activation energies for the catalysed and non-catalysed soot combustion were calculated and properly discussed.The results reveal that ceria-based catalysts greatly enhance their activities under NOx/O 2 between 425ºC and 450ºC, due to the "active oxygen"-assisted soot combustion. Remarkably, copper/ceria-zirconia shows a slightly higher soot combustion rate than the Pt-based catalyst (under NOx/O 2 , at 450ºC).

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“…It has been shown that the oxidation of soot by NO 2 occurs at typical exhaust temperature of diesel engines (250-400ºC) [2,[6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Giménez-Mañogil¹,

Garcı́a-Garcı́a²

2015

Fuel Processing Technology

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“…The NO 2 breakthrough curves obtained for all samples are presented in Figs. 1 and 2, showing also the NO concentration curves, as nitrogen monoxide is known to be the product of surface reduction of NO 2 , on carbonaceous adsorbents [16]. The shape of the NO 2 breakthrough curves recorded for the activated carbonisates (Fig.…”

Section: Resultsmentioning

confidence: 99%

Carbonaceous Materials Obtained from Sewage Sludge for NO₂Removal under Wet Conditions at Room Temperature

Pietrzak

2010

Acta Phys. Pol. A

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The effect of the processes of carbonisation and activation on adsorbents obtained from sewage sludge and their sorption properties towards NO2 were studied. Carbonaceous adsorbents were obtained by carbonisation of sewage sludge at 600• C for four different times 30, 60, 90 and 120 min followed by activation of the carbonisates by CO2 at 800• C for 60 min. Adsorption of NO2 was carried out in wet air. It has been shown that by appropriate thermal and chemical treatment of sludge, mesoporous adsorbents capable of NO2 removal can be obtained. The sorption abilities of the carbonised and activated samples to adsorb NO2 have been shown to increase with increased time of carbonisation and reach maximum for the carbonisation maintained for 90 min. Further increase in this time causes a decrease in the adsorption abilities of the samples. The sorption properties of the carbonisates have been proved to be determined by the chemical character of the surface, while those of the activated samples -by the porous structure.

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“…Heterogeneous reaction of NO2 with carbonaceous materials (commercial carbon black, spark generator soot, Diesel soot from passenger car and high-purity graphite) at elevated temperature (400°C) was studied using DRIFT spectroscopy. Different infrared signals appear when NO2 is adsorbed either on aliphatic or graphitic domains of soot (Muckenhuber and Grothe, 2007).…”

Section: Diffuse Reflectance Infrared Fourier Transform (Drifts) Specmentioning

confidence: 99%

Application of FTIR Spectroscopy in Environmental Studies

Simonescu¹

2012

Advanced Aspects of Spectroscopy

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Figure 1. Schematic representation of the electromagnetic spectrum (adapted from http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/UV-Vis/spectrum)? Advanced Aspects of Spectroscopy 50Infrared radiation is divided into:near (NIR, ν = 10,000 -4,000 cm -1 ); -middle (MIR, ν = 4,000 -200 cm -1 ) and -far (FIR, ν = 200 -10 cm -1 ).Because all compounds show characteristic absorption/emission in the IR spectral region and based on this property they can be analyzed both quantitatively and qualitatively using FT-IR spectroscopy.Today FT-IR instruments are digitalized and are faster and more sensitive than the older ones. FT-IR spectrometers can detect over a hundred volatile organic compounds (VOC) emitted from industrial and biogenic sources. Gas concentrations in stratosphere and troposphere were determined using FT-IR spectrometers (Puckrin et al., 1996).In case of environmental studies FTIR Spectroscopy is used to analyze relevant amount of compositional and structural information concerning environmental samples (Grube et al., 2008). The analysis can be performed also to determine the nature of pollutants, but also to determine the bonding mechanism in case of pollutants removal by sorption processes. Techniques for measuring gas pollutants such as continuous air pollutants analyzer (SO2, NO2, O3, NH3), on-line gas chromatography (GC) used simple real-time instruments to quantify gas pollutants. They need to use several sensors in order to analyze multiple gas pollutants simultaneously.FT-IR spectroscopy coupled with other spectroscopic techniques such as AAS (atomic absorption spectroscopy) have been used to assess the impact of industrial and natural activities on air quality (Kumar et al., 2005;Childers et al., 2001).In addition to the traditional transmission FTIR (T-FTIR) methods (e.g. KBr-pellet or mull techniques), modern reflectance techniques are widely used today in environmental, agricultural, pharmaceuticals, and food studies. These modern techniques are attenuated total reflection FTIR (ATR-FTIR), and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The choice of the method to be used depends on many factors such as: the information needed (bulk versus surface analysis), the physical form of the sample, the time required for sample preparation (Majedová et al., 2003).In the following there will be presented some of the most important research studies related to the involvement of FTIR spectroscopy in environmental studies. Traditional transmission FT-IR (T-FTIR) spectroscopy in environmental studiesTransmission spectroscopy is the oldest and most commonly used method for identifying either organic or inorganic chemicals providing specific information on molecular structure, chemical bonding and molecular environment. It can be applied to study solids, liquids or gaseous samples being a powerful tool for qualitative and quantitative studies. Application of FTIR Spectroscopy in Environmental Studies 51FTIR instrument's principle of function is the following: IR radi...

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A DRIFTS study of the heterogeneous reaction of NO2 with carbonaceous materials at elevated temperature

Cited by 72 publications

References 31 publications

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Carbonaceous Materials Obtained from Sewage Sludge for NO₂Removal under Wet Conditions at Room Temperature

Application of FTIR Spectroscopy in Environmental Studies

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A DRIFTS study of the heterogeneous reaction of NO2 with carbonaceous materials at elevated temperature

Cited by 72 publications

References 31 publications

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Opportunities for ceria-based mixed oxides versus commercial platinum-based catalysts in the soot combustion reaction. Mechanistic implications

Carbonaceous Materials Obtained from Sewage Sludge for NO2Removal under Wet Conditions at Room Temperature

Application of FTIR Spectroscopy in Environmental Studies

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Carbonaceous Materials Obtained from Sewage Sludge for NO₂Removal under Wet Conditions at Room Temperature