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Nitrogen oxide can refer to a binary compound of oxygen and nitrogen, or a mixture of such compounds:

In atmospheric chemistry, air pollution, and related fields, nitrogen oxides refers specifically to NOx (NO and NO2).[1][2]

Only the first three of these compounds can be isolated at room temperature. N2O3, N2O4, and N2O5 all decompose rapidly at room temperature. NO3, N4O, and N(NO2)3 are very reactive.

N2O is stable and rather unreactive at room temperature, while NO and NO2 are quite reactive but nevertheless quite stable when isolated.

NOx[edit]

Main article: NOx

NOx (often written NOx) refers to NO and NO2. They are produced during combustion, especially at high temperature. These two chemicals are important trace species in Earth's atmosphere. In the troposphere, during daylight, NO reacts with partly oxidised organic species (or the peroxy radical) to form NO2, which is then photolysed by sunlight to reform NO:

NO + CH3O2 → NO2 + CH3O
NO2 + sunlight → NO + O

The oxygen atom formed in the second reaction then goes on to form ozone; this series of reactions is the main source of tropospheric ozone. CH3O2 is just one example of many partly oxidised organic molecules that can react with NO to form NO2.

These reactions are rather fast so NO and NO2 cycle, but the sum of their concentration ([NO] + [NO2]) tends to remain fairly constant. Because of this cycling, it is convenient to think of the two chemicals as a group; hence the term NOx.

In addition to acting as a main precursor for tropospheric ozone, NOx is also harmful to human health in its own right.

NOx may react with water to make nitric acid, which may end up in the soil, where it makes nitrate, which is of use to growing plants.

Derivatives[edit]

Oxidized (cationic) and reduced (anionic) derivatives of many of these oxides exist: nitrite (NO
2
), nitrate (NO
3
), nitronium (NO+
2
), and nitrosonium (NO+
). NO2 is intermediate between nitrite and nitronium:

NO+
2
+ e → NO2
NO2 + eNO
2

See also[edit]

References[edit]

  1. ^ United States Clean Air Act, 42 U.S.C. § 7602
  2. ^ Seinfeld, John H.; Pandis, Spyros N. (1997), Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, Wiley-Interscience, ISBN 0-471-17816-0 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Nitrogen_oxide — Please support Wikipedia.
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1907 news items

 
LocalGov
Wed, 02 Jul 2014 03:41:15 -0700

In fact, vehicle emission standards have been lowered by 80-90% over the last 25 years, which has been largely successful in driving down vehicle emissions with the notable exception of nitrogen oxide. Similarly, while the UK is broadly compliant with ...
 
Turn to 10
Mon, 28 Jul 2014 14:56:15 -0700

(AP) - The largest coal-fired power plant in the West will produce one-third less energy by 2020 and could close in 2044 under a proposal that the federal government adopted to cut haze-causing emissions of nitrogen oxide at places like the Grand Canyon.
 
Sacramento Bee
Mon, 28 Jul 2014 11:33:45 -0700

FLAGSTAFF, Ariz. -- The largest coal-fired power plant in the West will produce one-third less energy by 2020 and is on track to cease operations in 2044 under a proposal that the federal government adopted to cut haze-causing emissions of nitrogen ...

Nanotechnology News (press release)

Nanotechnology News (press release)
Sun, 27 Jul 2014 21:41:15 -0700

Indium oxide is a very good material for the detection of the toxic nitrogen oxide gas. Due to the importance of the detection of this gas for environment protection, researchers have produced sensors based on indium oxide nanorods in this research and ...

The New Republic

The New Republic
Mon, 28 Jul 2014 17:09:36 -0700

Before that, in 1989, the utility lobbying arm Edison Electric Institute claimed regulating the roots of the problem—sulfur dioxide and nitrogen oxide—would lead to unacceptable electricity rates. The CEO of Southern Power testified to Congress that ...
 
Arizona Public Media
Mon, 28 Jul 2014 16:26:15 -0700

The Environmental Protection Agency released its final requirement for emissions reductions at the Navajo Generating Station in northern Arizona. The plant's co-owners will shut down one of three generators at the facility to comply with a requirement ...
 
Knoe.com
Mon, 28 Jul 2014 15:00:24 -0700

... coal-fired power plant in the West. The largest coal-fired power plant in the West will produce one-third less energy by 2020 and could close in 2044 under a proposal that the federal government adopted to cut haze-causing emissions of nitrogen ...
 
KJZZ
Mon, 28 Jul 2014 17:11:15 -0700

He said EPA is allowing the plant's owners to come up with their own methods to cut nitrogen oxide and other emissions by 80 percent before the year 2030. "We kind of said go out and come back with a flexible approach and if it's better than the one ...
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