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A unique high-throughput approach to identify new catalysts for total oxidation of methane from the exhaust gas of biogas-operated lean-burn engines is presented. The approach consists of three steps: (1) A primary screening using emission-corrected Infrared Thermography (ecIRT). (2) Validation in a conventional plug flow gas phase reactor using a model exhaust gas containing CH4, O2, CO, CO2, NO, NO2, N2O, SO2, H2O. (3) Ageing tests using a simplified exhaust gas (CH4, O2, CO2, SO2, H2O). To demonstrate the efficiency of this approach, one selected dataset with a sol-gel-based catalysts is presented. Compositions are 3 at.% precious metals (Pt, Rh) combined with different amounts of Al, Mn, and Ce in the form of mixed oxides. To find new promising materials for the abatement of methane, about two thousand different compositions were synthesized and ranked using ecIRT, and several hundred were characterized using a plug flow reactor and their ageing behaviour was determined.

The design of a reliable and effective catalytic bed with high and reproducible performance is one of the key steps during the development of a highly concentrated hydrogen peroxide thruster. The present paper focuses on the development and characterization of such a catalyst for the decomposition of hydrogen peroxide. A catalyst pre-screening performed by Heraeus on various precious metal-based catalysts supported on alumina granules showed that Pt is the most promising metal for the decomposition of H 2 O 2. Some further investigations were carried out to study the influence of various preparation parameters on the catalytic activity of the Pt catalysts. The prepared catalysts were characterized with various technics (transmission electron microscopy, X-ray diffraction, specific surface area) to better understand the impact of the studied preparation parameters on the catalyst activity for hydrogen peroxide decomposition. Finally, some monopropellant firing tests were performed by ONERA using the most promising catalysts and this paper presents some of the results obtained in their test facility.

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