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Selective catalytic reduction

About: Selective catalytic reduction is a research topic. Over the lifetime, 10502 publications have been published within this topic receiving 226291 citations.


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Journal ArticleDOI
TL;DR: In this paper, mesoporous TiO2 spheres supported MnCeW mixed oxide catalysts for selective catalytic reduction of NOx with NH3 were prepared by a wet impregnation method.
Abstract: In this work, mesoporous TiO2 spheres supported MnCeW mixed oxide catalysts (MnCeW/m-TiO2) for selective catalytic reduction of NOx with NH3 were prepared by a wet impregnation method. It is interesting that the MnCeW/m-TiO2 catalysts exhibited excellent SCR activity and N2 selectivity in a wide temperature range, even under the high gas hourly space velocity. From in situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTs) studies of desorption, it could be concluded that the addition of tungsten brought about more Bronsted acid sites and reduced the energy barrier of NOx species adsorbed on the surface. At high temperature range, there were still some Bronsted acid sites and NOx species including bidentate nitrate and nitro compounds in MnCeW/m-TiO2, therefore more intermediates could take part in the SCR reactions as well as better catalytic performance. Besides, the in situ DRIFTs of transient reactions indicated that the formed NH3 species and NOx species of MnCeW/m-TiO2 were more re...

116 citations

Journal ArticleDOI
15 Apr 2021-Fuel
TL;DR: In this paper, the effects of Fe2O3 based diesel oxidation catalyst and selective catalytic reduction catalyst on the engine characteristic of diesel engine fueled with biodiesels and diesel in the experimental study were investigated.

116 citations

Journal ArticleDOI
TL;DR: This work investigated the effect of propene on the activity of Fe-ZSM-5 for selective catalytic reduction of NO(x) with ammonia (NH(3)-SCR), and proposed a deactivation mechanism of Fe(3+) active site blockage by propene residue.
Abstract: Application of Fe-zeolites for urea-SCR of NOx in diesel engine is limited by catalyst deactivation with hydrocarbons. In this work, we investigated the effect of propene on the activity of Fe-ZSM-5 for selective catalytic reduction of NOx with ammonia (NH3-SCR), and proposed a deactivation mechanism of Fe3+ active site blockage by propene residue. The NO conversion decreased in the presence of propene at various temperatures, while the effect was not significant when NO was replaced by NO2 in the feed, especially at low temperatures (<300 °C). The surface area and pore volume were decreased due to carbonaceous deposition. The site blockage was mainly on Fe3+ sites on which NO was to be oxidized to NO2. The activity for NO oxidation to NO2 was significantly inhibited on a propene poisoned catalyst below 400 °C. The adsorption of NH3 on the Bronsted acid sites to form NH4+ was not hindered even on the propene poisoned catalyst, and the amount of absorbed NH3 was still abundant and enough to react with NO2 ...

116 citations

Journal ArticleDOI
TL;DR: In this article, a new type of redox heterogeneous catalysts based on geopolymer aluminosilicate materials was developed and their catalytic properties have been demonstrated on industrially important reactions.

116 citations

Journal ArticleDOI
TL;DR: Overall, the SiO2/Ag2O@TiO2 composite can be used as a cost-effective reduction catalyst for converting the toxic 4-NP into useful 4-AP, an industrial organic intermediate compound.
Abstract: The n-type TiO2 semiconductor nanoparticles were coated on the p-type Ag2O nanoparticles deposited on SiO2 spherical particles through a simple sol–gel method for catalytic reduction of 4-nitrophenol. The as-prepared spherical composite abbreviated as SiO2/Ag2O@TiO2 was characterized by different techniques and tested as a catalyst towards 4-nitrophenol (4-NP) reduction into 4-aminophenol (4-AP) with NaBH4 as a reducing agent at room temperature. This work combines an interesting design with the n-type TiO2 rich in electrons outward and the p-type Ag2O rich in electronic holes inward to form the p/n junction for the purpose of efficiently separating the charge carrier to have a longer lifetime of outward electrons for catalytic reduction reactions. The SiO2/Ag2O@TiO2 composite catalyst showed the best performance in the reduction of 4-NP to 4-AP within 30 seconds. Our results reveal that the p–n junction combined composite sphere was superior and efficient in reduction of 4-nitrophenol without using the light source. The conversion mechanism is proposed here. Overall, the SiO2/Ag2O@TiO2 composite can be used as a cost-effective reduction catalyst for converting the toxic 4-NP into useful 4-AP, an industrial organic intermediate compound.

115 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023311
2022632
2021546
2020583
2019604
2018595