Nitrogen Oxides (NOx) Removal

Ibáñez, Jorge G.; Rajeshwar, Krishnan

doi:10.1007/978-1-4419-6996-5_125

Cited by 1 publication

(2 citation statements)

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“…The carbon-catalyzed NO oxidation mechanism includes two consecutive steps. (1) The reaction intermediate CC is formed from the transition state (2NO + O 2 ) ads , which is derived from the physical adsorption of NO and O 2 . (2) The configuration or conformation of CC ads and N 2 O 4,ads changes, and the N 2 O 4,bridge-ads decomposes into NO 2,ads to release the final product NO 2,free .…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nitrogen oxides (NO x ) are part of the most severe sources for atmospheric contaminants released from the burning of coal and vehicle exhaust gas. The limitation of NO x releases has become a global concern because NO x could result in severe environmental issues, including acid precipitation, photochemical fog, and ozone holes, which are detrimental to human health . Selective catalytic reduction (SCR) with ammonia is one of the commercial techniques for the reduction of NO x due to its high efficiency. − Currently, V 2 O 5 –WO 3 /TiO 2 catalysts are used worldwide to eliminate NO x from stationary sources with an operating temperature range of 300–400 °C.…”

Section: Introductionmentioning

confidence: 99%

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Carbon Nanotube@Microporous Carbon Core–Shell Nanowires for NO Oxidation: The Multiple Roles of Micropore Structure

Yin

Lian

Wang

et al. 2018

Ind. Eng. Chem. Res.

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Carbon nanotube@microporous carbon core–shell nanowires with tunable shell thicknesses and controllable pore size distributions were prepared by a one-pot resorcinol-formaldehyde resin coating of the carbon nanotubes, followed by carbonization and activation. The carbon nanowires were investigated experimentally and theoretically as the NO oxidation catalysts to identify the impact of a microporous structure on the NO conversion and oxidation mechanism. Shortening the diffusion path by decreasing the diameter of the nanowires could eliminate the microporous diffusion limitation and improve the catalytic activity. NO conversion is related to the presence of ultramicropore. Ultramicropore with pore sizes of 0.61–0.7 nm play a dominant role in the catalytic oxidation, which could concentrate the reactant and facilitate the formation of reaction products. A two-step reaction mechanism, in which the (2NO + O2)ads molecular group confined in the micropore acts as the transition state, is proposed for the carbon-catalyzed NO oxidation.

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Section: ■ Introductionmentioning

confidence: 99%