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Details about DENOX-BLUE


What is Nitrogen Oxide Pollution

  • Nitrogen Oxide is an irritating gas which causes inflammation of airways at higher concentrations. When nitrogen comes out during combustion, it combines with Oxygen atoms to form Nitric Oxide (NO). The reaction propagates further with oxygen to make NO2. Nitric Oxide (NO) is not dangerous for health at ambient concentration levels but the Nitrogen Dioxides can be hazardous. Nitric Oxide and Nitrogen dioxides together are known as Nitrous Oxides
  • These nitrous oxides gases react to form acid rains and smog; both have adverse effects on health and environment.

What is Bharat Stage Emission Standard?

  • Bharat stage emission standards (BSES) are emission standards instituted by the Government of India to regulate the output of air pollutants from internal combustion engines and Spark-ignition engines equipment, including motor vehicles. The standards and the timeline for implementation are set by the Central Pollution Control Board under the Ministry of Environment & Forests and climate change.
  • The standards, based on European regulations were first introduced in 2000. Progressively stringent norms have been rolled out since then. All new vehicles manufactured after the implementation of the norms have to be compliant with the regulations. Since October 2010, Bharat Stage (BS) III norms have been enforced across the country. In 13 major cities, Bharat Stage IV emission norms have been in place since April 2010 and it has been enforced for entire country since April 2017. In 2016, the Indian government announced that the country would skip the BS-V norms altogether and adopt BS-VI norms by 2020.

What is DENOX-BLUE Diesel Exhaust Fluid?

  • Diesel engines can be run with a lean burn air-to-fuel ratio (overstoichiometric ratio), to ensure the full combustion of soot and to prevent them exhausting un-burnt fuel. The excess of air necessarily leads to generation of nitrogen oxides (NOx), which are harmful pollutants, from the nitrogen in the air. Selective catalytic reduction is used to reduce the amount of NOx released into the atmosphere. DENOX-BLUE Diesel exhaust fluid (DEF) from a separate tank can be injected into the exhaust pipeline, where the aqueous urea vaporizes and decomposes to form ammonia and carbon dioxide. Within the SCR catalyst, the NOx are catalytically reduced by the ammonia (NH3) into water (H2O) and nitrogen (N2), which are both harmless; and these are then released through the exhaust.

How does DENOX-BLUE Diesel Exhaust Fluid work?

Diesel Exhaust Fluid (DEF) is solution of automotive grade urea, (NH2)2CO. When it is injected into the hot exhaust gas stream, the water evaporates and the urea thermally decomposes to form ammonia and isocyanic acid:


(NH2)2CO → NH3 + HNCO


The isocyanic acid hydrolyses to carbon dioxide and ammonia: HNCO +  H2O → CO2 + NH3


Overall, this is (NH2)2CO + H2O → 2NH3 + CO2


From this point, ammonia, in the presence of oxygen and a catalyst, will reduce nitrogen oxides:


2NO + 2NH3 +  1⁄2 O2 → 2N2 + 3 H2O and 3NO2 + 4 NH3 →  3 1⁄2 N2 + 6 H2O


The overall reduction of NOx by urea is:


2 (NH2)2CO + 4NO + O2 → 4N2 + 4H2O + 2CO2 & 2(NH2)2CO + 3 NO2 →  31⁄2 N2 + 4 H2O + 2CO2


DENOX-BLUE Diesel Exhaust Fluid Specifications

  • The DENOX-BLUE DEF is a solution of Purest form multistage processed de-ionised water with Automotive Grade Urea with Low Aldehyde and Buiret, practically free from all Metals and contaminations.
  • It matches various parameters laid down by ISO 22241.