Efficient redox catalysis by RuO2 in the generation of oxygen and bromine from aqueous bromate solutions

Duonghong, Dung; Erbs, Wilson; Li, Shuben; Grätzel, Michaël

doi:10.1016/0009-2614(83)87246-7

Cited by 17 publications

(12 citation statements)

References 8 publications

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“…Heterogeneous catalysis has already been demonstrated to be an efficient method for the removal of bromate from water by hydrogen reduction to more desirable species, such as bromide [2,3,[7][8][9][10][11][12]. Nevertheless, to the best of our knowledge , the potential application of bimetallic catalysts has yet to be tested in this process Such systems have demonstrated potential to enhance the hydrogen reduction of nitrites in water [13][14][15][16], which have been reported to have a mechanism similar to that of bromate [7].…”

Section: The Consequent Classification Of Bromate By the Internationamentioning

confidence: 99%

Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water

et al. 2015

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The association of bromate in drinking water with several public health risks, namely related to its carcinogenic potential and its toxic nature, has led to an interest in the development of sustainable alternatives for its removal from water. The hydrogen reduction of bromate over supported heterogeneous metallic catalysts has already been shown to be an interesting alternative for the reduction of bromate into less hazardous species, without formation of additional sludges. In this work, the coupling of a noble metal with a second metal supported on activated carbon has been studied for this reaction. Several metals were used for this goal, resulting in a wide array of combinations of noble and promoter metals. All the combinations showed remarkable activity for the complete conversion of bromate into bromide, without accumulation of by-products. The role played by the second metal was extensively studied, for which experiments were conducted using physical mixtures of the corresponding monometallic catalysts and also different metal amounts on the supported bimetallic catalysts. In most cases, the presence of a second metal hindered the activity of the noble metal, when compared with the respective monometallic catalyst. In the case of the Pd-Cu bimetallic catalyst, it is possible to improve the activity obtained with the Pd catalyst. The activity of the bimetallic catalyst was shown to be dependent on the composition.

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Section: The Consequent Classification Of Bromate By the Internationamentioning

confidence: 99%

Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water

et al. 2015

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“…37 Bromate can be reduced by direct reaction with hydrogen in solution, by adsorption and reduction by hydrogen on the surface of the zeolite and also by adsorption and reduction by hydrogen on the surface of the metallic particles.…”

Section: View Article Onlinementioning

confidence: 99%

“…To complete the cycle, hydrogen also reduces the metal phases, which are available again to further interact with bromate and hydrogen. 37…”

Section: Catalytic Testsmentioning

confidence: 99%

Highly efficient reduction of bromate to bromide over mono and bimetallic ZSM5 catalysts

et al. 2015

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The reduction of bromate to bromide was successfully catalyzed by mono and bimetallic catalysts based on ZSM5 zeolites. This reaction is important since the presence of bromate in water is potentially carcinogenic to humans. The catalysts were prepared by ion-exchange and incipient wetness methods with different metals (copper, palladium, rhodium and thorium) using ZSM5. Several analytical techniques (N 2 adsorption, TPR experiments, NH 3 -TPD, FTIR, XRD, SEM/EDX and TEM/EDX) were used to characterize the mono and bimetallic catalysts prepared by the two methods. The catalytic tests were carried out in a semi-batch reactor under hydrogen, working at room temperature and pressure. All catalysts prepared are undeniably effective in achieving the complete conversion of bromate into bromide. The most promising among the catalysts tested in this work are the palladium bimetallic catalysts.

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“…Catalytic reduction of bromate to bromide can be a sustainable alternative to these methods. Duonghong et al [17] showed that ruthenium dioxide supported on TiO 2 catalysed the bromate reduction whilst water molecules were oxidised. They studied the pH influence in the reaction and concluded that an acidic pH was necessary in order to increase the reaction rate, but if the pH was too low Br 2 instead of Br − was formed.…”

Section: Introductionmentioning

confidence: 99%

The Influence of the Support Nature and the Metal Precursor in the Activity of Pd‐based Catalysts for the Bromate Reduction Reaction

et al. 2021

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Palladium catalysts supported on different materials (alumina, activated carbon and mixed oxide derived from hydrotalcite) and prepared with different metal precursors (nitrate, chloride and acetate) have been characterized and tested for the bromate reduction reaction. The catalytic behavior depends on the support nature and on the metallic precursor used for the catalyst preparation. Pd catalyst supported on a mixed oxide has a low activity due to the high affinity of the reconstructed support for the Br− formed, preventing the reactants to approximate the active Pd sites. Pd catalyst supported on activated carbon has a surface negative charge and a microporous structure, making difficult the interaction of the active sites with the reactants. The best results are obtained with the catalyst supported on alumina due to its physical‐chemical properties, i. e. mesoporosity, positive surface charge and reversible adsorption of reactants and products. These characteristics make easy bromate and H2 adsorption on the active sites and subsequent reaction, thus resulting in a better activity. The Pd precursor salt also influences the catalytic activity as it has an effect on the Pd nanocrystal size. The best results are obtained with the metal precursor that produces homogeneous and large Pd metallic crystallites.

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Efficient redox catalysis by RuO2 in the generation of oxygen and bromine from aqueous bromate solutions

Cited by 17 publications

References 8 publications

Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water

Bimetallic activated carbon supported catalysts for the hydrogen reduction of bromate in water

Highly efficient reduction of bromate to bromide over mono and bimetallic ZSM5 catalysts

The Influence of the Support Nature and the Metal Precursor in the Activity of Pd‐based Catalysts for the Bromate Reduction Reaction

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