Abstract: An ammonia catalytic abatement apparatus and method having two types of catalytic converters in line, wherein the first catalytic converter preferably including platinum as the catalytic agent converts or reduces the ammonia in an ammonia laden gas stream to N2, H2O and approximately equal stoichiometric proportions of NOx and the remaining unconverted NH3. The second catalytic converter which preferably is a selective catalytic reduction (SCR) catalyst then converts substantially all of the NOx+NH3 to N2+H2O vapor. The ammonia laden gas stream is first heated to the reaction temperatures of the catalytic converters which in the disclosed embodiment is about 300° C. The disclosed apparatus further includes a recuperative heat exchanger which preheats the gas prior to the heating element.

Abstract: A two chamber regenerative thermal oxidizer comprises an oxidizing chamber and a pair of regenerator chambers. Inlet and outlet valves control fluid flow to and from said regenerator chambers. A transition duct communicates with a contaminated fluid feed duct upstream of the regenerator inlet valves and with the oxidizing chamber of said oxidizer. A purge air duct directs the output of the regenerator chambers back to the chambers, selectively. Electronic control means effects powered actuation of said valves, selectively, in a prearranged sequence whereby the inlet and outlet valves in the respective regenerators are never open at the same time thereby precluding short circuiting of the regenerative chamber, yet all of the inlet and outlet valves to the regenerative chambers are never simultaneously closed thereby to maintain the pressure of fluid flow through said regenerator chambers relatively constant.