Pre-converter mounting device

A catalyst element comprising;

• a) a housing having an inlet and an outlet and defining an interior chamber;
• b) a monolithic catalyst body having an inlet and an outlet, said catalyst body positioned within the interior chamber;
• c) a sleeve with an inlet and an outlet and a cross-sectional profile similar to the cross-section of the monolithic catalyst body, said sleeve being disposed in the interior chamber, and cantilever mounted on the inlet of the monolithic catalyst body, the sleeve outlet overlapping a portion of the monolithic catalyst body adjacent the monolithic catalyst body inlet;
• d) a screen mounted on the inlet of the sleeve;
• e) a plurality of short channel metal microlith catalysts mounted inside said sleeve between said screen and the monolithic catalyst body;
• f) first intumescent mat means overwrapping the monolithic catalyst body and the portion of the sleeve overlapping the monolithic catalyst body;
• said first intumescent mat means being compressed between the sleeve and the housing;
• and
• g) a second intumescent mat means beneath the first intumescent mat means and inserted between the sleeve outlet and the overlapped portion of the monolithic catalyst body.