The heterogeneous reaction between soot and NO2 at elevated temperature

Muckenhuber, H.; Grothe, Hinrich

doi:10.1016/j.carbon.2005.08.003

Cited by 118 publications

(96 citation statements)

References 34 publications

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“…This experiment has originally been developed at the Vienna University of Technology in order to analyse the oxidation processes of soot particles from diesel engines (Muckenhuber and Grothe, 2006;Ofner and Grothe, 2007). Soot is a multi-component system, which is extremely difficult to analyse.…”

Section: Tpp Mass Spectroscopymentioning

confidence: 99%

“…Peaks below 150 • C are not interpreted because of outgassing of physically adsorbed molecules like H 2 O, N 2 , CO and CO 2 which might pollute the signals of pyrolysing functional groups. Based on the thermal stability of oxygen containing functional groups and their fragments (Muckenhuber and Grothe, 2006) peak maxima and relative peak intensities have been assigned to the different aerosol types (Table 3).…”

Section: Tpp-ms Of Solid Aerosol Phasementioning

confidence: 99%

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Physico-chemical characterization of SOA derived from catechol and guaiacol – a model substance for the aromatic fraction of atmospheric HULIS

et al. 2011

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Abstract. Secondary organic aerosol (SOA) was produced from the aromatic precursors catechol and guaiacol by reaction with ozone in the presence and absence of simulated sunlight and humidity and investigated for its properties as a proxy for HUmic-LIke Substances (HULIS). Beside a small particle size, a relatively low molecular weight and typical optical features in the UV/VIS spectral range, HULIS contain a typical aromatic and/or olefinic chemical structure and highly oxidized functional groups within a high chemical diversity. Various methods were used to characterize the secondary organic aerosols obtained: Fourier transform infrared spectroscopy (FTIR) demonstrated the formation of several carbonyl containing functional groups as well as structural and functional differences between aerosols formed at different environmental conditions. UV/VIS spectroscopy of filter samples showed that the particulate matter absorbs far into the visible range up to more than 500 nm. Ultrahigh resolved mass spectroscopy (ICR-FT/MS) determined O/Cratios between 0.3 and 1 and observed m/z ratios between 200 and 450 to be most abundant. Temperature-programmedpyrolysis mass spectroscopy (TPP-MS) identified carboxylic acids and lactones/esters as major functional groups. Particle sizing using a condensation-nucleus-counter and differentialmobility-particle-sizer (CNC/DMPS) monitored the formation of small particles during the SOA formation process.Correspondence to: H. Grothe (grothe@tuwien.ac.at) Particle imaging, using field-emission-gun scanning electron microscopy (FEG-SEM), showed spherical particles, forming clusters and chains. We conclude that catechol and guaiacol are appropriate precursors for studies of the processing of aromatic SOA with atmospheric HULIS properties on the laboratory scale.

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Section: Tpp Mass Spectroscopymentioning

confidence: 99%

Section: Tpp-ms Of Solid Aerosol Phasementioning

confidence: 99%

Physico-chemical characterization of SOA derived from catechol and guaiacol – a model substance for the aromatic fraction of atmospheric HULIS

et al. 2011

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“…1,2 They play an important role in global climate change. The global greenhouse effect of soot has been estimated to be the second strongest after CO 2 due to the absorption of radiation, which directly influences the radiative budget of the atmosphere.…”

Section: Introductionmentioning

confidence: 99%

The photoenhanced aging process of soot by the heterogeneous ozonization reaction

Han

2016

Phys. Chem. Chem. Phys.

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The atmospheric aging of soot can significantly modify its composition and microstructure, likely leading to changes in its effects on climate and health. The photochemical aging process of soot by O 3 under simulated sunlight was investigated using in situ attenuated total internal reflection infrared spectroscopy.Simulated sunlight could markedly enhance the aging of soot by O 3 , which produced various oxygen containing species such as lactones, anhydrides, ketones and aldehydes. Elemental carbon (EC) showed minor reactivity toward O 3 . The organic carbon (OC), which was mainly composed of various polycyclic aromatic hydrocarbons (PAHs) and some unidentified components, played a key role in the photochemical aging of soot by O 3 . The kinetics of aromatic species on soot can be well described by a pseudo-first order reaction. The fitting results of the pseudo first-order rate constant (k 1,obs ) as a function of O 3 concentration demonstrated that the photochemical reaction of soot with O 3 followed the Langmuir-Hinshelwood mechanism.

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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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The heterogeneous reaction between soot and NO2 at elevated temperature

Cited by 118 publications

References 34 publications

Physico-chemical characterization of SOA derived from catechol and guaiacol – a model substance for the aromatic fraction of atmospheric HULIS

Physico-chemical characterization of SOA derived from catechol and guaiacol – a model substance for the aromatic fraction of atmospheric HULIS

The photoenhanced aging process of soot by the heterogeneous ozonization reaction

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

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