Patent
Process for reducing an eliminating nitrogen oxides in an exhaust gas
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TLDR
In this article, the concentrations of NO and NO 2 in nitrogen oxides contained in an exhaust gas are adjusted to substantially equal concentrations, whereupon the exhaust gas is held in contact with a metallic oxide catalyst together with ammonia.Abstract:
The concentrations of NO and NO 2 in nitrogen oxides contained in an exhaust gas are adjusted to substantially equal mol concentrations, whereupon the exhaust gas is held in contact with a metallic oxide catalyst together with ammonia. Owing to the adjustment of the NO and NO 2 concentrations in the nitrogen oxides, the reaction rate is enhanced, and the nitrogen oxides are reduced even at a low temperature. The adjustment of the concentrations of NO and NO 2 in the nitrogen oxides is done by the oxidation of NO with ozone, the catalytic oxidation of NO with air or oxygen, the addition of nitric acid, the addition of NO or NO 2 , etc.read more
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Catalysts for selective catalytic reduction denox technology
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Process for removing nox and sox from exhaust gas
TL;DR: In this article, exhaust gases containing oxides of nitrogen and sulfur from a fired process heater, a fossil fuel fired boiler, or a chemical process are diverted from a stack prior to admission to the atmosphere through a duct system containing heat exchangers that reduce the exhaust gas from an elevated temperature, if any, to about ambient temperature.
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TL;DR: In this paper, a process for reducing the ignition temperature of diesel soot is described, which involves contacting a hot exhaust from a diesel engine, which exhaust contains diesel soots, with a catalytic composite, which comprises a particulate filter coated with a sulfur resistant refractory inorganic oxide selected from the group consisting of titania, zirconia, silica, and silica-alumina.
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Process for removal of nox from fluid streams
TL;DR: In this article, a process and apparatus for removing nitrogen oxides from a gas stream is described, which is characterized by passing the gas stream through a first catalytic zone in the absence of added ammonia and in the presence of an oxidation catalyst to convert the NO content thereof to NO 2.
References
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Catalytic process for reducing nitrogen oxides to nitrogen
Fumito Nakajima,Masato Takeuchi,Shimpei Matsuda,Shigeo Uno,Mori Toshikatsu,Yoshihisa Watanabe,Makoto Imanari +6 more
TL;DR: In this paper, an intimate mixture of titanium (Ti) as component A, with B. at least one metal selected from the group consisting of molybdenum (Mo), tungsten (W), iron (Fe), vanadium (V), nickel (Ni), cobalt (Co), copper (Cu), chromium (Cr), and uranium (U), in the form of their oxides, was used for reducing nitrogen oxides to nitrogen.
Patent
Process for removing nitrogen oxide from a waste gas
TL;DR: In this article, a process for removing nitrogen oxide contained in a waste gas is disclosed which includes oxidizing the nitrogen oxide to nitrogen dioxide by mixing the gas with nitric acid vapor in the presence of porous adsorbing agent such as silica gel, colloid earth, alumina, molecular sieves or the like.