NOx reducing agent AUS 32 ("ADBlue") for SCR systems; Approved NOx reducing agent AUS 32 ("ADBlue") - BB00.40-P-0352-00A

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 Mercedes-Benz ML350, 2010 Mercedes-Benz ML350, 2009 Mercedes-Benz ML320, 2009 Mercedes-Benz GL320, and 2008 Mercedes-Benz ML320. However, it is still accessible from the selected car via links, so may be relevant.

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For diesel engines, direct diesel injection technology has developed to the point where it can nearly be called the standard technology. The very tough legislation now in place to regulate diesel engine exhaust emissions makes exhaust after treatment technology a must. That is why many of today's passenger car diesel engines are equipped with oxidation catalytic converters. Further exhaust after treatment systems will be needed for at least the heavier vehicles in the passenger car and light commercial vehicle categories in order to comply with the latest emissions regulations.

A range of systems are currently in development, and in some cases already in use, for reducing NO x emissions. In heavy commercial vehicles NOx catalytic converters employing urea as the reducing agent provide a system for the highly selective reduction of nitrogen oxide emissions. Here, there is selective catalytic NO x reduction in the presence of ammonia.

The urea/water solution introduced into the exhaust train is first converted into ammonia via an upstream reaction stage. In the subsequent catalytic reduction process, the ammonia breaks down most of the NO x to nitrogen and water.

The urea-SCR process for exhaust after treatment is state of the art. A detailed description of the quality of the reducing agent must form the basis for the universal, manufacturer-independent introduction of this technology and is essential for ensuring the long-term operation of the exhaust after treatment system. The reducing agent requirements have been published in standards DIN 70070 (requirements) and DIN V 70071 (test procedure).

Standardization on international level has been completed and can be found in the international standard ISO 22241.

An urea/water solution must be used for Mercedes vehicles based on the requirements of ISO 22241 In Europe, the brand name "AdBlue" is frequently used for this quality. When using qualities not conforming to the specification, damages to the Bluetec system cannot be ruled out.

Approved NOx reducing agent AUS 32 ("ADBlue") specification, see BB00.40-P-0352-01A