Low-temperature SCR of NOx with NH3 over Nomex (TM) rejects-based activated carbon fibre composite-supported manganese oxides Part I. Effect of pre-conditioning of the carbonaceous support

Nomex (TM) rejects-based activated carbon fibre composites, recently develo ped at our laboratory, were tested as catalytic supports for the low-temper ature selective catalytic reduction (SCR) of nitric oxide with ammonia. Imp regnation of the support was performed by equilibrium adsorption of a dilut ed aqueous solution of manganese acetate. Prior to impregnation, different pre-conditioning procedures of the carbonaceous support were investigated. These comprised steam activation and oxidation with air and different liqui ds. The modified supports were characterised by different techniques and th e impregnated catalysts were tested for SCR of NO at 150 degreesC. The best catalytic results were achieved after support activation at 20 wt.% (S-BET approximate to 1000 m(2) g(-1)) and oxidation with nitric acid at 90 degre esC for 1-2 h. (C) 2001 Elsevier Science B.V. All rights reserved.