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Introduction PM emission reduction is a challenging technological step for diesel engines, and is being tackled in the framework of a strict regulation worldwide.Diesel particulate filters (DPF) are the most common devices for the collection of particulate matter for on-board diesel exhaust after-treatment.Most DPFs perform a catalytically assisted regeneration; however, good contact conditions are difficult to be reached between soot particles and the catalytic coating of the DPF, which clearly hinders the overall activity of the catalyst itself.