Felix Ott

M. Sc.
Felix Ott
Lehrstuhl für Heterogene Katalyse und Technische Chemie


Building: Sammelbau Chemie

Room: 38C 319

Worringerweg 2

52074 Aachen


Phone: +49 241 80 26185
Fax Fax: +49 241 80 22177


NOx-emissions (NO and NO2) produced by diesel engines are a big threat to humans and the environment. Selective Catalytic Reduction (SCR) is a technology to eliminate NOx by using a reducing agent and catalyst to reduce NO to nitrogen. Currently ammonia is used as a reducing agent in stationary and mobile Applications for the NH3-SCR. But especially the use in cars and lorries poses the issue of the cold start problem, in which the conversion of NO is only catalyzed at certain temperatures and especially at starting phases NOx -emissions are emitted unhindered. Based on that, the search for alternative methods is very important.

One possibility is the H2-SCR. H2-SCR utilizes hydrogen as a reducing agent and allows for a reduction below 200 °C. Because of the formation of the greenhouse gas N2O as a possible byproduct in this method, the use of highly selective catalysts to form N2 is required.

Single Atom Alloys (SAA) are a subgroup of single atom catalysts (SAC). They are catalysts consisting of a support coated with a layer of host metal and doped with single atoms of a noble metal. The SAA-structure enables a synergistic effect between the components by combining the high activity of noble metals with the high selectivity of the host metal. Using noble metals in the form of single atoms also carries the advantage of minimal amounts of usage of expensive materials.

The use of SAA in H2-SCR contains a big potential because of the possibility of a selective conversion of NO at low temperatures with very low material cost because of the SAA-structure. In general, there are no investigations and understanding about SAA for the H2-SCR, so it is important to gain a first overview of SAA-systems with different combinations of supports, host- and noble metal combinations and identify systems active for the conversion of NO below 200 °C. Promising catalysts then must be part of further and deeper investigations and Analysis to gain a better understanding.