Patent
Treatment method for removing nitrogen oxide
Kindaichi Yoshiaki,嘉昭 金田一,Hamada Hideaki,秀昭 浜田,Ito Tatsuhiko,建彦 伊藤,Motoi Sasaki,基 佐々木,Mitsunori Tabata,光紀 田畑,Fujio Suganuma,藤夫 菅沼,Tadao Nakatsuji,忠夫 仲辻,Shimizu Hiromasu,宏益 清水 +15 more
TLDR
In this article, a reduction reaction between NOx and hydrocarbons on a reduction catalyst in an oxidative atmosphere, NO2 is reduced more easily than NO, an exhaust gas is previously contacted with an oxidation catalyst to oxidize NO in the exhaust gas into NO2.Abstract:
PURPOSE:To remove NOx in an exhaust gas efficiently. CONSTITUTION:From a viewpoint that in the reduction reaction between NOx and hydrocarbons on a reduction catalyst in an oxidative atmosphere, NO2, is reduced more easily than NO, an exhaust gas is previously contacted with an oxidation catalyst to oxidize NO in the exhaust gas into NO2. The treated exhaust gas, in an oxidative atmosphere containing excessive oxygen and in the presence of hydrocarbons, is contacted with a reduction catalyst selected from zeolite of a proton type, zeolite of an alkali metal type, and acid metal oxide (metal oxide treated with a compound having sulfate group to reduce NO2, in the exhaust gas into nitrogen.read more
Citations
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Patent
Cu-CHA/Fe-BEA mixed zeolite catalyst and process for the treatment of NOx in gas streams
TL;DR: In this paper, the authors proposed a selective catalytic reduction (SCR) catalyst for a gas stream comprising NO using the BEA structure type and the MFI structure type.
Patent
Off gas purification device
TL;DR: An exhaust gas purification catalyst apparatus has a noble metal component for oxidizing NOx in an exhaust gas discharged from a diesel engine, a reducing agent spraying means for supplying the reducing agent selected from a urea component or an ammonia component as mentioned in this paper.
Patent
Exhaust gas purification method using selective reduction catalyst
TL;DR: An exhaust gas purification method for reducing selectively NOx in exhaust gas, which is exhausted from a lean burn engine, such as a boiler, a gas turbine or a lean-burn-type gasoline engine, is described in this article.
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Exhaust gas catalytic purging unit using selective reduction catalyst, exhaust gas purging method, and diesel automobile equipped with exhaust gas catalytic purging unit
Yasuyuki Banno,Nagata Makoto +1 more
TL;DR: An exhaust gas purification catalyst apparatus with an oxidation catalyst (DOC) having a noble metal component for oxidizing a nitrogen oxide (NO) in exhaust gas discharged from a diesel engine, a reducing agent spraying means for supplying an urea component or an ammonia component, and a selective reduction catalyst (SCR) for reducing the nitrogen oxide by making contacted with the reducing agent, in this order from the upstream side of a flow passage of exhaust gas.
Patent
Method for denitrifying exhaust gas and system therefor
TL;DR: In this article, the proportion of NO2 contained in the exhaust gas is increased with an oxidizing agent or an oxidation catalyst, an organic nitrogen compound having a nitrile group is added as a reducing agent to exhaust gas and denitration by reduction of the NOx is carried out in the presence of a denitoration catalyst in the temperature region of 100-300 deg.C.
References
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Patent
Removing nitrogen oxide in flue-gas
TL;DR: In this article, the authors proposed a method to selectively remove nitrogen oxide in flue-gas containing large amounts of oxygen by bringing flue gas produced by combustion of fuel into contact with a catalyst consisting of hydrogen type mordenite or hydrogen type clinoptilolite in the coexistence of an organic compd.