SO2 sorption on fresh and aged SOx traps

Limousy, Lionel; Mahzoul, H.; Brilhac, Jean-François; Gilot, P.; Garin, F.; Maire, G.

doi:10.1016/s0926-3373(02)00235-7

Cited by 58 publications

(48 citation statements)

References 31 publications

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“…Even though only NO2 is supplied to the system, other nitrogen oxides-containing species (as NO) are formed due to reduction of NO2 in the presence of activated carbon [11][12][13][14][15][16][17]. The reduction of NO2 to NO is highly undesirable because the separation capacities of activated carbons for NO are negligible.…”

Section: Nox Adsorption On the Different Activated Carbonsmentioning

confidence: 99%

“…Despite the emission reduction measures implemented for automotive and industrial exhaust gases [13][14][15][16], vehicle occupants and urban population are particularly affected by high or even increasing nitrogen oxides immissions. As a result, the interest in adsorptive cabin air filters and HVAC (Heating, Ventilation and Air Conditioning) filters is rising.…”

Section: Introductionmentioning

confidence: 99%

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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: Nox Adsorption On the Different Activated Carbonsmentioning

confidence: 99%

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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“…Two recent papers [14,15] deal in part with the regeneration of Pd catalysts under reductive conditions, but they provide limited information, i.e., they do not supply data about the deactivation conditions. So, Limousy et al [14] studied the reduction with hydrogen of surface sulphates in a sulphur-poisoned de-NO x catalyst (other reducing agents, such as CO where discarded), mentioning the formation of sulphites and sulphides during the reduction.…”

Section: Introductionmentioning

confidence: 99%

“…So, Limousy et al [14] studied the reduction with hydrogen of surface sulphates in a sulphur-poisoned de-NO x catalyst (other reducing agents, such as CO where discarded), mentioning the formation of sulphites and sulphides during the reduction. Jones et al [15] compared the regenerability of sulphur-poisoned Pd, Rh and Pt catalysts under hydrogen atmosphere, concluding that this procedure is efficient for Rh, and in minor extension for Pd, whereas it is not efficient for Pt.…”

Section: Introductionmentioning

confidence: 99%

Methane catalytic combustion over Pd/Al2O3 in presence of sulphur dioxide: development of a regeneration procedure

Ordóñez¹,

Hurtado²,

Dı́ez³

2005

Catal Lett

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Five different procedures (treatments with hydrogen, nitrogen, wet and dry air, and under vacuum) were tested for the regeneration of a partially deactivated alumina-supported Pd catalyst, used for the catalytic incineration of methane in presence of SO 2 . The efficiency of these processes was evaluated considering the temperatures at which both, the catalysts deactivation, and the regeneration processes, took place. As general trend, hydrogen treatment is the best regeneration procedure, followed by treatment with wet air, whereas high deactivation temperatures lead to less efficient regeneration. The efficiency of the regeneration was observed to increase as regeneration temperature increases. These trends are discussed according to the results obtained in the characterisation of deactivated catalyst samples using TPR, TPO and TPD.

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“…One of the most common formulation uses Pt and Ba supported on Al 2 O 3 [21]. The problem of this material is its fast poisoning by sulphur compounds, its low activity at low temperatures and, specially, the cost of the precious metal [21][22][23]. Mixed oxides derived from hydrotalcites have also been proposed as active catalysts in this reaction [24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional catalyst for maximizing NOx oxidation/storage/reduction: The role of the different active sites

Palomares

Uzcátegui

Franch

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tA multifunctional catalyst/storage material has been prepared to maximize NO x removal. This material is based on mixed oxides derived from modified layered double hydrotalcites (LDH). A cobalt catalytic function oxidizes the NO to NO 2 . The NO 2 is stored as nitrate in the basic sites of the material. The basic properties of the Co/Mg/Al mixed oxide derived from LDH were enhanced by doping with sodium, improving the storage capacity of the catalyst. Finally, the introduction of vanadium sites, enables the reduction-decomposition of the nitrates. This multisite catalyst/storage material results in a well equilibrate formulation that maximizes catalyst conversion and regenerability.

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SO2 sorption on fresh and aged SOx traps

Cited by 58 publications

References 31 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

Methane catalytic combustion over Pd/Al2O3 in presence of sulphur dioxide: development of a regeneration procedure

Multifunctional catalyst for maximizing NOx oxidation/storage/reduction: The role of the different active sites

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