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1. (WO2013122924) SELECTIVE CATALYTIC REDUCTION SYSTEM AND PROCESS FOR CONTROL OF NOX EMISSIONS IN A SULFUR-CONTAINING GAS STREAM

Pub. No.:    WO/2013/122924    International Application No.:    PCT/US2013/025723
Publication Date: Fri Aug 23 01:59:59 CEST 2013 International Filing Date: Wed Feb 13 00:59:59 CET 2013
IPC: B01D 53/86
B01D 53/94
Applicants: SIEMENS ENERGY, INC.
SOBOLEVSKIY, Anatoly
Inventors: SOBOLEVSKIY, Anatoly
Title: SELECTIVE CATALYTIC REDUCTION SYSTEM AND PROCESS FOR CONTROL OF NOX EMISSIONS IN A SULFUR-CONTAINING GAS STREAM
Abstract:
An exhaust gas treatment process, apparatus, and system for reducing the concentration of NOx, CO and hydrocarbons in a gas stream, such as an exhaust stream (29), via selective catalytic reduction with ammonia is provided. The process, apparatus and system include a catalytic bed (32) having a reducing only catalyst portion (34) and a downstream reducing-plus-oxidizing portion (36). Each portion (34, 36) includes an amount of tungsten. The reducing-plus-oxidizing catalyst portion (36) advantageously includes a greater amount of tungsten than the reducing catalyst portion (36) to markedly limit ammonia salt formation.