The relation between surface composition of Pd–Cu/ACC catalysts prepared by selective deposition and their denitrification behavior

Preparation of PdCu Alloy Nanocatalysts for Nitrate Hydrogenation and Carbon Monoxide Oxidation

“…A 45% selectivity of nitrogen is achieved on both samples. For low We also note that the same tendency has been displayed on PdCu/ACC and PdAg/Al 2 O 3 catalysts for denitrification [41,42]. In these two catalytic reactions, palladium is assigned as the active phase for hydrogen activation and the consecutive hydrogenation sites for nitrite.…”

Nitrate Reduction Catalyzed by Pd–Cu and Pt–Cu Supported on Different Carbon Materials

“…This fact could be related to the size of the metallic particles, due to the different interactions of the precursors with the support during impregnation. Matatov-Meytal and Sheintuch [13] reported that changes in the surface of metallic particles supported on activated carbon cloths, namely the orientation of copper, influence the catalytic performance in nitrate hydrogenation. In this work, it was observed by TEM micrographs that the catalysts supported on AC1 and CXG present high metal particle sizes.…”

“…To the best of our knowledge, there are no studies on the influence of the surface chemistry of activated carbons used as support of the mentioned metallic phases in the nitrate reduction. Matatov-Meytal and Sheintuch [13] studied the relation between the surface composition of Pd-Cu catalysts supported on activated carbon cloths and their activity and selectivity. However, they only present surface composition results of high resolution scanning electron microscopy (HRSEM) and CO chemisorption.…”

“…The formation of ammonium as by-product is the critical problem of this process. Since the discovery by Vorlop and Tacke [4], several studies have been carried out using bimetallic catalysts, such as Pd-Cu [5][6][7], Pt-Cu [5,8], Pd-Sn [9][10][11][12] supported on different materials such as activated carbon [13][14][15][16], cationic resin [17], alumina [18,19], titania [20,21], and other metal oxides [22][23][24][25]; however, the selectivities are not yet satisfactory. The activity and selectivity of the bimetallic catalysts in nitrate reduction have shown to be highly dependent on the preparation method, mode of noble metal promoting, metal-promoter ratio as well as the operation conditions.…”

The effect of support porosity on the selectivity of Pd–In/support catalysts in 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. The mechanism of these systems has not been explained unequivocally yet.…”