Denitrification

Japanese: 脱硝 - だっしょう(英語表記)denitrification
Denitrification
An industrial term. The reduction of nitrogen oxides using a catalyst, converting them to nitrogen and water and making them non-toxic. Nitrogen oxides (especially nitrogen dioxide, NO 2 ) generated by the high-temperature combustion of various fuels (natural gas, gasoline, diesel, and heavy oil) are air pollutants that cause photochemical smog, and removing them from the smoke from thermal power plants and factories and from automobile exhaust gases (denitrification) is an important issue. In large fixed facilities such as thermal power plants, ammonia is used as the reducing agent and oxides such as vanadium are used as the catalyst. Denitrification of exhaust gas from gasoline-powered automobiles is carried out by using hydrocarbons in the exhaust gas as the reducing agent and a catalyst containing precious metals (platinum, palladium).

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:
工業用語。窒素酸化物を触媒を用いて還元し,窒素と水に変えて無毒化すること。各種燃料 (天然ガス,ガソリン,軽油,重油) の高温での燃焼に伴い発生する窒素酸化物 (特に二酸化窒素 NO2 ) は,光化学スモッグの原因となる大気汚染物質であり,火力発電所や工場の排煙や自動車の排気ガスからこれを除去すること (脱硝) は重要な問題である。火力発電所などの大型固定設備では,アンモニアを還元剤とし,バナジウムなどの酸化物を触媒とする方法がとられる。ガソリン自動車の排気ガスの脱硝は,排気ガス中の炭化水素を還元剤として利用し,貴金属 (白金,パラジウム) を含む触媒を用いて行われている。

出典 ブリタニカ国際大百科事典 小項目事典ブリタニカ国際大百科事典 小項目事典について 情報

<<:  Decolorization - decolorization

>>:  Skim milk - Dasshinyu (English spelling)

Recommend

Captain Cook

Please see the Cook page. Source: Encyclopaedia B...

Encho - Director

⇒ Sanyutei Encho (first generation) Source: Kodans...

Kamiakasaka Castle

This mountain castle was located in Chihayaakasaka...

Tondabayashi [city] - Tondabayashi

A city in southern Osaka Prefecture. It was incorp...

Vormärz (English spelling)

...From 1783 to 1848, the Magistrat (City Council...

Turtle Fall - Listen

...In India, the turtle also serves as the vehicl...

Chinzei Magistrate - Chinzeibugyo

The position was established by the Kamakura Shog...

Bakst - Bakusuto (English spelling) Léon Bakst

A Russian painter and stage designer. His real na...

"Kokuhei Kouki" - Kinhira Kouki

…There are also noteworthy detailed historical re...

China Trans-China Expressway

This expressway runs east-west from the Hanshin r...

Police box - koban

A police station is a subordinate organization of...

Sanshu [village] - Samizu

A village in Kamiminochi County in northern Nagano...

Ka-tan

Chinese politician and geographer in the mid-Tang...

Red Volta - Akaboruta

…Its basin area is about 400,000 km2. The upper r...

Makrobiotik (English spelling)

…As a leading figure in the Berlin School, he was...