Catalytic reduction of nitrates and nitrites in water solution on pumice-supported Pd–Cu catalysts

Deganello, Francesca; Liotta, Leonarda Francesca; Macaluso, Andrea; Venezia, Anna Maria; Deganello, G.

doi:10.1016/s0926-3373(99)00109-5

Cited by 171 publications

(97 citation statements)

References 21 publications

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“…10). The calculated value of 42.2 kJ mol −1 is very close to values obtained for Pd/Cu catalysts supported on other carriers [3,9]. The low value of the apparent activation energy should be expected for this ionic-type reaction.…”

Section: Discussionsupporting

confidence: 83%

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Cloth catalysts for water denitrification

Matatov-Meytal

Barelko

Yuranov

et al. 2001

Applied Catalysis B: Environmental

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The use of glass fibers in the form of woven cloth (GFC), as a new type of catalytic support, was studied for the reduction of aqueous nitrate solutions using a Pd/Cu-GFC catalyst. The activity (per gram Pd) and selectivity to nitrogen were found to be comparable with those found for Pd-Cu catalysts supported on the other carriers. The maximal initial removal activity was found for a catalyst with a Pd/(Pd + Cu) ratio of 0.81. The corresponding activity was 0.7 mmol min −1 (g Pd ) −1 , and the selectivity was 97 mol% at 25 • C and pH 6.5 for initial nitrate concentration of 100 mg l −1 . The selectivity to nitrogen declined at high conversions of nitrate and high pH.

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Section: Discussionsupporting

confidence: 83%

“…Attempts to solve the contacting problem of the three phases and to reduce the diffusion resistance have included the use of novel catalyst supports [8,9].…”

Section: Introductionmentioning

confidence: 99%

Cloth catalysts for water denitrification

Matatov-Meytal

Barelko

Yuranov

et al. 2001

Applied Catalysis B: Environmental

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“…These studies are mainly carried out in batch reactors and with distilled water containing only nitrates [4,[22][23][24][25]. Nevertheless, the presence of other ions in the reaction media could influence the activity and selectivity of the catalyst [26][27][28], for this reason it is important to study the activity of the bimetallic catalysts supported on different materials, but using polluted natural water that contains other ions together with the nitrates and preferably with a continuous reactor.…”

Section: Introductionmentioning

confidence: 99%

A study of different supports for the catalytic reduction of nitrates from natural water with a continuous reactor

2011

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The aim of this work is to study the activity for the nitrate catalytic reduction in natural water, using a continuous stirred tank reactor, of Pd/Cu and Pd/Sn catalysts supported on different materials. The studied supports are: -Al 2 O 3 (commercial), active carbon, graphite, hydrotalcite and alumina synthesized in our laboratory with a high surface area. The activity and selectivity of the catalysts supported on these materials have been compared. The best results have been obtained with the Pd/Sn catalysts supported on alumina. These results show that the surface area of the support is not the only important characteristic for an active catalyst in this reaction, being also very significant its acid-base properties, its electrical conductivity and its interaction with the metallic active sites. The adequate combination of these characteristics is necessary to obtain an active catalyst. The influence of the Pd/Sn content on the activity of the alumina supported catalysts was studied, observing that the best activity was obtained when the Pd/Sn ratio was higher than 1. This result clearly indicates that it is necessary to have both Pd and Pd-Sn centers in order to obtain an active catalyst.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Krawczyk

Karski

Witońska

2011

Reac Kinet Mech Cat

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The influence of support porosity on the selectivity of home-made 5%Pd-2%In/support (support = SiO 2 , Al 2 O 3 , TiO 2 ) catalysts in nitrate reduction was studied. The main final products of the reaction were N 2 and NH 4? . Together with the decrease in pore diameter, an increase in ammonia concentration in the reaction mixture was observed. It is probably caused by slow diffusion of OH -ions from narrow pores to the solution.

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Catalytic reduction of nitrates and nitrites in water solution on pumice-supported Pd–Cu catalysts

Cited by 171 publications

References 21 publications

Cloth catalysts for water denitrification

Cloth catalysts for water denitrification

A study of different supports for the catalytic reduction of nitrates from natural water with a continuous reactor

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

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