Cary P Allen

US Patent:

62998471, Oct 9, 2001

Filed:

Jun 29, 1999

Appl. No.:

9/342691

Inventors:

Cary P. Allen - Farmington Hills MI

Assignee:

Durr Environmental - Wixom MI

International Classification:

C01C 112
B01J 802
C01B 2120

US Classification:

423237

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 N. sub. 2, H. sub. 2 O and approximately equal stoichiometric proportions of NO. sub. x and the remaining unconverted NH. sub. 3. The second catalytic converter which preferably is a selective catalytic reduction (SCR) catalyst then converts substantially all of the NO. sub. x +NH. sub. 3 to N. sub. 2 +H. sub. 2 O 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. degree. C. The disclosed apparatus further includes a recuperative heat exchanger which preheats the gas prior to the heating element.