Popular Mechanics have published a review of the 2010 Mazda CX-7 Diesel SUV. 'The engine features a new diesel particulate filter (DPF) made from a ceramic material with high thermal resistance, and it includes a unique catalyst developed by Mazda, which incorporates oxygen that's stored in the base material. Supplemented by the oxygen present in the exhaust gases, the catalyst improves the combustion of soot emissions. The increased level of oxygen speeds the regeneration of the filter, making it more efficient. Filter regeneration is only needed half as often as conventional systems, and each regeneration process takes only a third as long.'
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