Catalytic removal, of nitrogen oxides

Peng, X., Lin, H., Huang, Z. et al. (2006) Effect of catalysis on plasma assisted catalytic removal of nitrogen oxides and soot, Chem. Eng. Technol. 29, 1262-6. 

Catalytic removal of nitrogen oxides [1] and sulfur oxides [2] is one of the most important issues in environmental problems. We have investigated supported ruthenium carbido-cluster catalysts derived from [RUjC(CO),J crystal. The supported cluster was... 

Tlhe catalytic removal of nitrogen oxides from automotive exhaust gases has been the subject of many studies. Catalysts containing at least 20 different metals, alone and in combination, have been tested. We found that the support used in catalyst preparation is as important as the metal, particularly in catalyst selectivity toward nitrogen rather than ammonia in strongly reducing streams. This paper is a report on some of the effects of support chemistry in a fairly well known system, platinum-promoted nickel (I). We also elucidate the pathways of ammonia removal in this system. 

The catalytic removal of nitrogen oxides (NOx) is a technology urgently required for the protection of our atmospheric environment. The catalytic reduction of nitrogen... 

Teraoka, Y., Nakano, K., Shangguan, W.F., and Kagawa, S. (1996) Simultaneous catalytic removal of nitrogen oxides and diesel soot particulate over perovskite-related oxides. Catal Today, 27, 107-113. 

Tronconi, E., Forzatti, R, Gomez Martin, J.R, and MaUoggi, S. Selective catalytic removal of nitrogen oxide (NO ) A mathematical model for design of catalyst and reactor. Chem. Eng. Sci. 1992, 47, 2401-2406. 

Reactions involving the catalytic reduction of nitrogen oxides are of major environmental importance for the removal of toxic emissions from both stationary and automotive sources. As shown in this section electrochemical promotion can affect dramatically the performance of Rh, Pd and Pt catalysts (commonly used as exhaust catalysts) interfaced with YSZ, an O2 ion conductor. The main feature is strong electrophilic behaviour, i.e. enhanced rate and N2 selectivity behaviour with decreasing Uwr and , due to enhanced NO dissociation. 

Bioprocesses for the removal of nitrogen oxides from polluted air are an interesting alternative [58], but current reaction rates are still too low for large-scale applications. Advanced biological processes for the removal of NO from flue gases are based on the catalytic activity of either eukaryotes or prokaryotes, e.g. nitrification, denitrification, the use of microalgae and a combined physicochemical and biological process (BioDeNO ). 

Iwamoto, M. Symposium on Catalytic Technology for the Removal of Nitrogen Oxides Catalysis Society of Japan Tokyo, 1990 pp 17-22. 

Jones J, Ross J. The Development of Supported Vanadia Catalysts for the Combined Catalytic Removal of the Oxides of Nitrogen and of Chlorinated Hydrocarbons from Flue Gases. Catal Today 1997 35 97-105. 

Removal of NOx from stack gas presents some formidable problems. Possible approaches to NOx removal are catalytic decomposition of nitrogen oxides, catalytic reduction of nitrogen oxides, and sorption of NOx by liquids or solids. 

Catalytic combustion is a process in which a combustible compound and oxygen react on the surface of a catalyst, leading to complete oxidation of the compound. This process takes place without a flame and at much lower temperatures than those associated with conventional flame combustion. Due partly to the lower operating temperature, catalytic combustion produces lower emissions of nitrogen oxides (NOx) than conventional combustion. Catalytic combustion is now widely used to remove pollutants from... 

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