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reducing agent AUS 32 for SCR after-treatment systems 41

6NO

reducing agent AUS 32 for SCR after-treatment

systems

General information

SCR (Selective Catalytic Reduction) catalysts can be used for NO

- emission reduction. The reducing agent (urea

solution with an urea concentration of 32.5%) in such catalysts reduces the nitrogen oxide emissions.

To ensure efﬁcient operation of the exhaust gas after-treatment system, compliance of the reducing agent

with the quality requirements stipulated in DIN 70070 / ISO 222 41-1 is mandatory.

In Europe, this reducing agent is often offered under the brand name “AdBlue”.

The test methods to determine the quality and characteristics of the reducing agent are speciﬁed in the

standards DIN 70071 / ISO 222 41-2. The following table shows the quality characteristics of the reducing

agent together with the associated test methods (extract from ISO 222 41-1).

Unit

Test Method ISO

Limit Value

Urea content

by weight %

22241–2

Annex B

31.8 - 33.2

Spec. grav. at 20 °C kg/m

3675

12185

1087.0 - 1092.0

Refractive index at 20 °C

22241–2

Annex C

1.3817 - 1.3840

Alkalinity as NH

by weight %

22241–2

Annex D

Max. 0.2

Biuret content

by weight %

22241–2

Annex E

Max. 0.3

Aldehyde content

mg/kg

22241–2

Annex F

Max. 5

Non-soluble constituents

mg/kg

22241–2

Annex G

Max. 20

Phosphate content as P0

mg/kg

22241–2

Annex B

Max. 0.5

Metal contents 22241–2

Annex I

Calcium mg/kg

Max. 0.5

Iron

mg/kg

Max. 0.5

Copper mg/kg

Max. 0.2

Zinc

mg/kg

Max. 0.2

Chrome mg/kg

Max. 0.2

Nickel

mg/kg

Max. 0.2

Aluminum

mg/kg

Max. 0.5

Magnesium

mg/kg

Max. 0.5

Sodium mg/kg

Max. 0.5

TIM ID: 0000038058 – 001

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MTU 12 V 4000 M63 Specifiche Pagina 43

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