In order to evaluate the performances of mullite foams as diesel particulate filters a complete characterisation has been carried out on lab-scale and engine-bench. The cellular materials tested have exhibited suitable mechanical properties to withstand both the canning pressure and the vibrations typical of real conditions. In terms of pressure drop and filtration efficiency a good compromise has been achieved. Moreover, their durability and reliability has been qualitatively assessed after several thermal regeneration runs in furnace, with positive results. A configuration of five filter with different porosity was assembled in a steel conteiner and tested at the exhaust of engine running in steady state condition with different air/fuel ratios and engine speeds at fixed start of combustion. The trap was located at two different locations of exhaust pipe in order to consider different exhaust temperature and particulate size. The development of suitable catalysts in order to promote the soot ignition at the typical Diesel exhaust temperatures beside the improvements of the trap design and the foam mechanical properties will allow to completely exploit the promising properties of this filtering material.
Diesel particulate filter based on ceramic foams
1999
Conference paper
English
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