NO oxidation over nitrogen doped carbon xerogels

Sousa, Juliana P. S.; Pereira, M.F.R.; Figueiredo, José L.

doi:10.1016/j.apcatb.2012.06.009

Cited by 79 publications

(68 citation statements)

References 55 publications

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“…This is in agreement with our previous report [39], where the presence of nitrogen groups on carbon xerogels was shown to enhance the oxidation of NO to NO 2 .…”

Section: Influence Of Surface Chemistry Of the Carbon Xerogels On No supporting

confidence: 83%

“…Mochida et al [38] found no relationship between surface area of the carbon materials and the removal of NO; however, the carbon materials used in this case were treated with sulphuric acid, and it is difficult to separate the effect of surface area and the effect of oxygen groups in the catalytic activity of carbon materials. Using nitrogen-doped carbon materials, the present authors did not find any correlation between NO conversion and surface area [8,39]. The carbon materials used in these works contained large amounts of nitrogen groups, which are known to enhance the activity of carbon materials in oxidation reactions [40][41][42].…”

Section: Catalytic Testsmentioning

confidence: 62%

“…This section is also intended to evaluate the effect of nitrogen groups introduced by post-treatment and to compare with N-doped carbon xerogels (where nitrogen is incorporated during the synthesis) [39]. Treatment with a urea solution at room temperature was performed in order to introduce nitrogen groups on the surface of the carbon xerogels.…”

Section: Influence Of Surface Chemistry Of the Carbon Xerogels On No mentioning

confidence: 99%

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Carbon Xerogel Catalyst for NO Oxidation

2012

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Carbon xerogels were prepared by the polycondensation of resorcinol and formaldehyde using three different solution pH values and the gels were carbonized at three different temperatures. Results show that it is possible to tailor the pore texture of carbon xerogels by adjusting the pH of the initial solution and the carbonization temperature. Materials with different textural properties were obtained and used as catalysts for NO oxidation at room temperature. The NO conversions obtained with carbon xerogels were quite high, showing that carbon xerogels are efficient catalysts for NO oxidation. A maximum of 98% conversion for NO was obtained at initial concentration of NO of 1000 ppm and 10% of O 2 . The highest NO conversions were obtained with the samples presenting the highest surface areas. The temperature of reaction has a strong influence on NO oxidation: the conversion of NO decreases with the increase of reaction temperature.

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“…This is in agreement with our previous report [39], where the presence of nitrogen groups on carbon xerogels was shown to enhance the oxidation of NO to NO 2 .…”

Section: Influence Of Surface Chemistry Of the Carbon Xerogels On No supporting

confidence: 83%

Section: Catalytic Testsmentioning

confidence: 62%

Section: Influence Of Surface Chemistry Of the Carbon Xerogels On No mentioning

confidence: 99%

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Carbon Xerogel Catalyst for NO Oxidation

2012

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“…wide variety of precursors such as melamine [17][18][19], urea [20], 3-hydroxypyridine [21], or ammonia [22]. Also, innovative proposals make use of porphyrins [23] and biomass [24] for the preparation of nitrogenated carbons.…”

Section: Introductionmentioning

confidence: 99%

N-doped monolithic carbon aerogel electrodes with optimized features for the electrosorption of ions

Rasines¹,

Lavela

Macías³

et al. 2015

Carbon

128

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A B S T R A C T N-doped carbon aerogels were synthesized by the polycondensation of resorcinolformaldehyde-melamine mixtures. The prepolymerization of the precursors was determinant for the preparation of meso/macroporous aerogels with varied nitrogen content, regardless the solution pH and M/R molar ratio. The effect was more pronounced at pH 6, as the hydrogels prepared by the one-step route displayed essentially a microporous character, as opposed to the mesoporous network after prepolymerization. The prepolymerized carbon aerogels presented large capacitance values due to the optimum balance between pore structure, improved wettability and low polarization resistance for the highly doped materials. Salt deionization capacity revealed the importance of the macropore structure in the monolithic configuration of the aerogels for a fast electrosorption of ions.

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“…Furthermore, nitrogen-doped carbon nanofibers (NCNFs) exhibited high electrocatalytic activity, long-term operation stability and excellent tolerance in fuel cells [23]. Recently, nitrogen-doped carbon xerogels were prepared from a nitrogen-containing polymer precursor via the sol-gel process [24], and they were excellent catalysts for NO oxidation at room temperature, for the presence of pyridine and pyrrole groups favored the oxidation of NO to NO 2 .…”

Section: Introductionmentioning

confidence: 99%

NH3-activated carbon nanofibers for low-concentration NO removal at room temperature

Wang

Guo

Huang

et al. 2015

Catalysis Communications

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Nitrogen-doped carbon nanofibers (NCNFs) were prepared by activating electrospun carbon nanofibers using NH 3 as activating agent at different temperatures. NCNFs with various contents of nitrogen were used as adsorbents and catalysts for low-concentration NO removal at room temperature. The NO removal efficiency over NCNFs was far above that over porous carbon nanofibers obtained by steam-activation, suggesting that NCNFs are efficient catalysts for low-concentration NO removal at room temperature. A maximum of 64.5% removal efficiency for NO was acquired at NO initial concentration of 20 ppm and 21 vol.% of O 2 at room temperature.

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NO oxidation over nitrogen doped carbon xerogels

Cited by 79 publications

References 55 publications

Carbon Xerogel Catalyst for NO Oxidation

Carbon Xerogel Catalyst for NO Oxidation

N-doped monolithic carbon aerogel electrodes with optimized features for the electrosorption of ions

NH3-activated carbon nanofibers for low-concentration NO removal at room temperature

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