A Dutch research scientist has constructed a mathematical model which will enable better understanding of the chemical process involved in NOx storage reduction (NSR) catalytic converters.

In a series of experiments Karen Scholz investigated the behaviour of the catalyst to better comprehend the action of the storage component functions, during which the conserved NOx is reduced to nitrogen over a precious metal such as platinum.

In particular, Ms Scholz examined the effect of the different types of barium which are present in the catalytic converter and the effect that carbon dioxide and water have on the exhaust gas.

She also conducted an investigation into the effects of reducing agents such as hydrogen, carbon monoxide and ethylene on the NOx reduction and storage process.

Using the aforementioned model, Ms Scholz has devised a regulatory system in the vehicle which will determine when the catalyst has reached maximum capacity as well as the timeframe during which extra fuel must be injected to regenerate the catalyst.

Ms Scholz' research was conducted in conjunction with a number of companies including Peugeot Citroen, Toyota, Ford and Shell.

Source:

Economical and cleaner cars with lean-burn catalytic converter,04/07/07
http://www.nwo.nl/nwohome.nsf/pages/NWOA_74JFVP_Eng

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