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The catalytic silencer consists of a flanged inlet leading to a <br /> corrosion resistant chamber containing the 'catalyst material. A flanged <br /> outlet allows hook-up to a MAXIM heat recovery unit. The catalyst con- <br /> taining baskets are made of stainless steel. For ease of catalyst <br /> removal and refitting, two renewal ports on top of the unit and two <br /> evacuation ports on the bottom of the unit are provided on the exterior <br /> of the chamber. <br /> The basic requirements for reduction of NOx by 90 percent or more <br /> are as follows: <br /> (a) The exhaust gas temperature into the catalytic silencer <br /> must be between 800OF and 12000F. <br /> (b) The engine air "to fuel ratio should be adjusted such that <br /> the exhaust stream mixture ranges between stoichiometric <br /> and 10 percent rich. (See Figure 1) <br /> (c) There must be sufficient CO to react, over the catalyst, <br /> with NOx. <br /> W The 02 level must be less than 0.5 percent by volume. <br /> Features of the MAXIM catalytic silencer are: <br /> (a) The unit acts as a semi-residential grade silencer for <br /> aid in noise control. <br /> (b) The replacement cost of the pelletized catalyst is <br /> inexpensive compared to a monolithic (single structure) <br /> catalyst. <br /> (c) Replacement of the catalyst does not require removal <br /> from the exhaust system as does the monolithic type. <br /> (d) The MAXIM catalytic silencers comply with current and <br /> proposed EPA, California and Texas state regulations. <br /> C/20 <br />