Interaction mechanism of NO2 with carbon black: effect of surface oxygen complexes

Jeguirim, Mejdi; Tschamber, Valérie; Brilhac, Jean-François; Ehrburger, P.

doi:10.1016/j.jaap.2004.03.008

Cited by 99 publications

(124 citation statements)

References 12 publications

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“…In fact, during TPD, the NO 2 and CO molecules always desorb at the same time, as well as the CO 2 and NO molecules, thus confirming the formation of a -C(ONO 2 ) surface complex [6]. This complex species can be formed on carbon presenting active sites (O-containing surface groups) with only one oxygen atom, such as those that indeed disappear in the FTIR spectra after adsorption test.…”

Section: Effect Of Porosity and Chemical Surface Groupsmentioning

confidence: 61%

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The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

et al. 2017

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Abstract:The treatment of NO x from automotive gas exhaust has been widely studied, however the presence of low concentrations of NO x in confined areas is still under investigation. As an example, the concentration of NO 2 can approximate 0.15 ppmv inside vehicles when people are driving on highways. This interior pollution becomes an environmental problem and a health problem. In the present work, the abatement of NO 2 immission is studied at room temperature. Three activated carbons (ACs) prepared by physical (CO 2 or H 2 O) or chemical activation (H 3 PO 4 ) are tested as adsorbents. The novelty of this work consists in studying the adsorption of NO 2 at low concentrations that approach real life immission concentrations and is experimentally realizable. The ACs present different structural and textural properties as well as functional surface groups, which induce different affinities with NO 2 . The AC prepared using water vapor activation presents the best adsorption capacity, which may originate from a more basic surface. The presence of a mesoporosity may also influence the diffusion of NO 2 inside the carbon matrix. The high reduction activity of the AC prepared from H 3 PO 4 activation is explained by the important concentration of acidic groups on its surface.

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Section: Effect Of Porosity and Chemical Surface Groupsmentioning

confidence: 61%

“…www.mdpi.com/journal/energies treatment [4][5][6]. However, studies on activated carbons (AC) performance for NO x removal showed promising results in term of adsorption efficiencies [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

et al. 2017

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“…As a consequence, exogenous CO 2 might be formed through direct carbon oxidation already at 300 • C, as described by Jeguirim et al [34,41] (Eq. (9)).…”

Section: Exogenous Co 2 Formationmentioning

confidence: 99%

“…The thermal degradation of metal nitrates in inert atmosphere has been broadly studied in the literature [25][26][27][28][29][30][31] and it was found that nitrates were removed as NO x between 150 and 300 • C. Similarly to the thermal decomposition of nitrocellulose -cellulose doped with nitric acid -it might be assumed that those NO x are mainly NO 2 [32]. Since carbon-based materials are efficient adsorbents [33], the extra-nitrogen measured in chars might therefore originate from the partial adsorption of NO 2 on the carbonaceous material [34] ( Table 3). This assumption will be further discussed in Section 4.3.…”

Section: Expression Of Product Yields On a "Catalyst-free Basis"mentioning

confidence: 99%

“…As far as carbonaceous matrixes are efficient adsorbents [33], it can be assumed that extra-nitrogen in chars is due to NO 2 adsorption. Although it has been shown that physisorbed NO 2 in chars was released at 110 • C [34], Zawadzki et al [42] demonstrated that NO 2 can be also chemisorbed on char surface and form different adsorbed species. Interestingly, although some species might desorb at 300 • C, others are very stable and might remain in chars at 500 • C. However, all the adsorbed species should decompose completely at 600 • C. Further work is needed to confirm these hypotheses.…”

Section: No 2 Adsorption On Charsmentioning

confidence: 99%

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Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Eibner

Broust

Blin

et al. 2015

Journal of Analytical and Applied Pyrolysis

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b s t r a c tCatalytic pyrolysis is a promising way to improve bio-oil product quality. In this study, metal salts were directly impregnated in biomass to generate in situ catalysts and investigate their impact on pyrolysis products. Seven metals -Ce, Mn, Fe, Co, Ni, Cu and Zn -were selected and impregnated in eucalyptus using nitrate salts. A fixed-bed reactor, pre-heated at 500• C and inerted with N 2 flow, was used for pyrolysis. Both gas and bio-oil compositions were analysed, paying particular attention to the production of anhydrosugars. The anhydrosugar yields were found to be strongly influenced by the presence of metal salt catalysts. In particular, both Zn and Co salts yielded more anhydrosugars in comparison with catalyst-free sample. Moreover, LAC (1-hydroxy-(1R)-3,6-dioxabicyclo[3.2.1]octan-2-one) was produced in higher amounts than levoglucosan which is commonly produced without any catalyst. Metals were found to remain in all chars and tended to form metal-based nanoparticles (e.g. Cu 0 , Ni 0 , ZnO) able to act as in situ catalysts during the pyrolysis process. It seems that those metal nanoparticles are closely related to LAC production. In parallel to metal cations, nitrates were also suspected to play a significant role during pyrolysis. The suspected impact of anions on levoglucosenone production is discussed. Concerning gas yields, the impregnated nitrate salts were found to strongly affect CO 2 production.

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Mechanistic Study of Carbon Oxidation with NO₂ and O₂ in the Presence of a Ru/Na‐Y Catalyst

Jeguirim¹,

Tschamber²,

Villani³

et al. 2009

Chem Eng & Technol

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The oxidation of model soot by NO 2 and O 2 in the presence of a Ru/Na-Y catalyst under conditions close to automotive exhaust gas after-treatment systems is investigated. Isothermal oxidation experiments of a physical mixture of carbon black and catalyst were performed in a temperature range of 300-400°C. A remarkable increase of the oxidation rate by NO 2 and O 2 in the presence of the Ru/Na-Y catalyst was observed. An overall mechanism involving oxygen transfer from the Ru catalyst to the carbon surface leading to an increase of C(O) complexes is proposed. These C(O) complexes are destabilized in the presence of NO 2 increasing the carbon oxidation rate.

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Interaction mechanism of NO2 with carbon black: effect of surface oxygen complexes

Cited by 99 publications

References 12 publications

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Mechanistic Study of Carbon Oxidation with NO₂ and O₂ in the Presence of a Ru/Na‐Y Catalyst

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Interaction mechanism of NO2 with carbon black: effect of surface oxygen complexes

Cited by 99 publications

References 12 publications

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

The Potential of Activated Carbon Made of Agro-Industrial Residues in NOx Immissions Abatement

Catalytic effect of metal nitrate salts during pyrolysis of impregnated biomass

Mechanistic Study of Carbon Oxidation with NO2 and O2 in the Presence of a Ru/Na‐Y Catalyst

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Mechanistic Study of Carbon Oxidation with NO₂ and O₂ in the Presence of a Ru/Na‐Y Catalyst