15 November 2018, 11.15-12.00
Viola Papetti, Research Scientist, Empa
Additive Manufactured (AM) Open Cell Structures: Promising automotive catalyst substrates for zero impact emissions
The increase in efficiency of combustion systems, in particular with hybridization, leads to the reduction of the inlet temperature of the exhaust aftertreatment. In parallel, emission legislation including real driving imposes more stringent limits. Modern vehicle catalysts need improvements during cold start, high mass flow and low load operation. The benchmark is the honeycomb, consisting of straight channels characterized by laminar flow. We propose a polyhedral lattice substrate of cubic cells with high porosity and low strut diameter, designed through simulations and realized by additive manufacturing. A microwave heating system increases catalyst conversion at low temperatures. The AM catalyst can obtain similar conversion with respect to the benchmark, but with much lower precious metals. The seminar will involve experimental and simulation results highlighting the potential of the innovative catalyst concept.
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