Activated Carbon Supported Metal Catalysts for Nitrate and Nitrite Reduction in Water

Abstract

Ten monometallic and 13 bimetallic catalysts supported on activated carbon were assessed, the former in the reduction of nitrate or nitrite and the latter in the nitrate reduction. Under the conditions used, nitrite was shown to be reduced by monometallic catalysts. With exception of Ru, only some of the bimetallic catalysts were able to reduce nitrate. Rh-Cu shows the highest conversion, but Pd-Cu is the most promising catalyst if selectivity into nitrogen is also considered.

The effect of support porosity on the selectivity of Pd–In/support catalysts in nitrate reduction

“…The flow rate of octyloamine phosphorate was 1.0 cm 3 /min. For the samples, concentrations of NH 4 ? ions were analyzed spectrophotometrically with the use of an ammonia test (2.6-193 mg/dm 3 NH 4 ?…”

“…The monometallic catalysts which were studied thoroughly are palladium systems supported on Al 2 O 3 [1,2], C [3][4][5], SnO 2 [6][7][8], CeO 2 [9], TiO 2 [10,11], and pumice [12]. Monometallic palladium catalysts are not very active in the reaction of nitrate reduction.…”

“…Monometallic palladium catalysts are not very active in the reaction of nitrate reduction. However, they show high activity in the reduction of nitrites [3][4][5][12][13][14]. Among the studied bimetallic systems, palladium systems promoted with Cu, Sn, Ag or Fe supported on different kinds of oxide carriers [14][15][16][17][18][19][20], polymers [21,22], zeolites [23], active carbons [24][25][26], resin [27][28][29], showed the best catalytic characteristics.…”

Catalytic Hydrogenation of Aqueous Phase Nitrate Over Fe/C Catalysts

“…The optimal loading of Fe is therefore about min -1 . Whereas in another study the catalytic conversion of 3% (in 5 h period) of nitrate from initial concentration of 100 ppm in volume of 800 mL with catalyst dose of 0.5 g L -1 over 1 wt% Fe/C has been reported [12]. This corresponds to catalytic activity of 0.038 mmol g metal -1…”

“…Whereas all other monometallic catalysts supported on carbon are inactive for nitrate reduction. Most of the catalysts for selective reduction of nitrate are bimetallic catalysts [12]. The present study deals with preparation, characterization and evaluation of monometallic Fe catalyst supported on activated carbon (Fe/C) for selective reduction of nitrate in water.…”