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NOx

About: NOx is a research topic. Over the lifetime, 26367 publications have been published within this topic receiving 496555 citations.


Papers
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Journal ArticleDOI
TL;DR: The supported V2O5-WO3/TiO2 catalysts have become the most widely used industrial catalysts for selective catalytic reduction (SCR) applications since introduction of this technology in the early 1970s as mentioned in this paper.
Abstract: The selective catalytic reduction (SCR) of NOx with NH3 to harmless N2 and H2O plays a crucial role in reducing highly undesirable NOx acid gas emissions from large utility boilers, industrial boilers, municipal waste plants, and incinerators. The supported V2O5–WO3/TiO2 catalysts have become the most widely used industrial catalysts for these SCR applications since introduction of this technology in the early 1970s. This Perspective examines the current fundamental understanding and recent advances of the supported V2O5–WO3/TiO2 catalyst system: (i) catalyst synthesis, (ii) molecular structures of titania-supported vanadium and tungsten oxide species, (iii) surface acidity, (iv) catalytic active sites, (v) surface reaction intermediates, (vi) reaction mechanism, (vii) rate-determining-step, and (viii) reaction kinetics.

315 citations

Patent
26 Feb 2004
TL;DR: In this article, the authors proposed a NOx occlusion catalyst which can be used to enhance a deterioration determination accuracy of a NoX occlusions catalyst, based on an operating condition of the internal combustion engine.
Abstract: PROBLEM TO BE SOLVED: To enhance a deterioration determination accuracy of a NOx occlusion catalyst. SOLUTION: This exhaust emission control device comprises: the NOx occlusion catalyst which occludes NOx when an air-fuel ratio of an inflow exhaust gas is lean, and which discharges the occluded NOx to perform reduction when the air-fuel ratio of the inflow exhaust gas is rich; a NOx amount calculation means for calculating a NOx amount occluded in the NOx occlusion catalyst based on an operating condition of the internal combustion engine; an air-fuel ratio control means for setting the air-fuel ratio to be rich when the NOx amount calculated by the NOx amount calculation means reaches a target occlusion amount; a target CO amount calculation means for calculating a CO amount required for reducing the NOx of the target occlusion amount; a used CO amount calculation means for calculating the CO amount actually used in the reduction of the NOx discharged from the NOx occlusion catalyst based on a detection result of an oxygen concentration detection means at a downstream side of the NOx occlusion catalyst; and a NOx occlusion catalyst deterioration determining means for determining deterioration of the NOx occlusion catalyst based on a deviation between the target CO amount and the used CO amount. COPYRIGHT: (C)2005,JPO&NCIPI

314 citations

Journal ArticleDOI
TL;DR: In this paper, the performance and emissions of biodiesel from different feedstocks have been evaluated in comparison to pure diesel, and the results showed that biodiesel can be used in compression ignition engine as a replacement of diesel fuel to fulfill the global energy demand.
Abstract: This paper analyzes the performance and emissions of biodiesel from different feedstocks. The main goal of this paper is to provide information to the engineers, industrialists and researchers who are interested on biodiesel and to emphasise biodiesel as a promising alternative replacement for fossil fuels. A substantial number of literatures from highly rated journals in scientific indexes were cited preferentially since 2000. The performance and emissions indicators such as brake torque, brake power, BTE, EGT, BSFC NOx, PM, CO, CO2, HC and smoke density have been evaluated in comparison to pure diesel. The results showed that different sources of biodiesel feedstocks give different results to engine performance and emissions. Surprisingly some of the research yielded favourable results towards the biodiesel as compared to pure diesel. The study concluded that biodiesel can be used in compression ignition engine as a replacement of diesel fuel to fulfil the global energy demand. However, further research on about optimisation, cost-effectiveness and availability of biodiesel needs to be carried out to help ensure that biofuel will be able to fully replace fossil fuel.

313 citations

Journal ArticleDOI
TL;DR: In this paper, a statistical analysis of roadside concentrations of nitrogen oxides (NOX) and nitrogen dioxide (NO2) in London shows that from 1997 to 2003 there has been a statistically significant downward trend (at the p = 0.004 level) in NOX averaged across a network of 36 sites.

313 citations

Journal ArticleDOI
TL;DR: In this paper, a novel combustor without flame is proposed by employing chemical-looping reactions, where NiO particles mixed with YSZ (yttria-stabilized zirconia) have very good properties for the oxygen carrier in the loop.
Abstract: A novel combustor without flame is proposed by employing chemical-looping reactions. Here we report the promising results on the novel combustor by kinetic and crystallographic study. We found that the NiO particles mixed with YSZ (yttria-stabilized zirconia) have very good properties for the oxygen carrier in the loop with respect to the reaction rate, conversion, and physical strength; especially the rate of oxidation of Ni is increased significantly. Furthermore, we observed that NOx was not generated in this combustor. Another significant feature, concerning the greenhouse impact, is that CO2 can easily be recovered.

313 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,699
20223,249
20211,405
20201,353
20191,367