Environmental Materials

a) Oxide-based catalytic nanoparticles

Catalytic nanoparticles are synthesized via scalable flame-spray or wet chemical methods. Transition metal oxide catalysts based on manganese-copper-oxide (Hopcalite) are important CO-Oxidation catalysts for filter applications. We have developed new carbon coating methods enhancing the long term stability of these catalysts under humid conditions. Bismuth and zinc oxide base materials are highly efficient absorber materials for the removal of H2S pollutants from air.

Flammensprühpyrolyse-Oxidkatalysatoren — Fig. 1: Flame spray synthesis of oxide catalysts (Hopcalite)

Technologies and applications

CO-Oxidation catalysts (Hopcalite nanoparticles)
Formaldehyde oxidation
Catalytic combustion
H2S removal

Links

http://www.sciencedirect.com/science/article/pii/S0926337315302423

http://pubs.acs.org/doi/abs/10.1021/acs.iecr.5b01404

http://www.metal-organic-frameworks.eu/filtermedia.shtml

b) Metallic nanoparticles and supported catalysts

Well defined metal nanoparticles supported on porous host materials combine a high catalytic activity and size selectivity due to the pore size engineering. Aerogels provide high porosity and low density.

Metallische-Nanopartikel — Fig. 2: Metallic nanoparticles supported on spherical activated carbon (SAC-1 and -2) for formaldehyde removal

Technologies and applications

Water treatment: Catalytic degradation of pharmaceutical residues (Diclofenac)
Formaldehyde oxidation for indoor applications
VOC oxidation for indoor applications and cabins
CO2-electroreduction

c) Porous filter materials

Metal-organic frameworks, porous carbons and polymers are important components for gas filtration. They provide clean air for indoor environments or for personal protection. Tuning the surface functionality is crucial to achieve a high selectivity under working conditions. High humidity applications require in depth knowledge of water adsorption behavior as a competitive adsorption mechanism.