2 in 1 – Diesel Particle Filter and Nitric Oxide Catalyst Combined

2 in 1 – Diesel Particle Filter and Nitric Oxide Catalyst Combined

Researchers from the Paul Scherrer Insitute (PSI) have been working on combining filtering soot and reducing nitric oxide of exhaust gas after-treatment in vehicle. A mixture of emissions that are harmful to health and the environment is formed during diesel combustion in vehicle engines. These include nitric oxide and soot particles – emissions that until now have been captured in separate parts of a vehicle’s exhaust gas treatment system. Due to this spatial separation more space is required for the after-treatment of exhaust gas.


The researchers Oliver Kröcher and Martin Elsener removing a soot sample from a test tube.
(c) Paul Scherrer Institute / Markus Fischer.

The researchers at PSI examined the impact that the deposition of soot has on the function of the SCR catalyst under realistic conditions. His results reveal that instead of being an interference factor, soot can actually aid the catalytic conversion of nitric oxides into harmless nitrogen. Mehring and his colleagues from the Bioenergy and Catalysis Laboratory demonstrated this with experiments where they studied different soot samples, including artificially manufactured soot and real soot samples produced by heavy-duty engines.

“Although this isn’t a huge amount, it’s good news for the developers, who have one main fear: that soot deposits might choke the reduction of nitric oxides,” says Oliver Kröcher, Head of the laboratory in a press release. “But as our projects show, this isn’t the case,” he adds.

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