Efficient hydrogen peroxide decomposition on bimetallic Pt–Pd surfaces

Hasnat, Mohammad A.; Rahman, Mohammed M.; Borhanuddin, S. M.; Siddiqua, Ayesha; Bahadur, Newaz Mohammed; Karim, Mohammad Razaul

doi:10.1016/j.catcom.2010.10.001

Cited by 55 publications

(29 citation statements)

References 37 publications

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“…These systems include bimetallic alloys [120], mixed-metal oxides [121], or even nanosized perovskite oxides [122]. In this sense, the combined use of mixed metal oxides (including perovskites) with noble metal catalysts has recently yielded excellent results [123].…”

Section: Use Of Metalsmentioning

confidence: 99%

Hydrogen Peroxide in Biocatalysis. A Dangerous Liaison

Hernández

Berenguer-Murcia²,

Rodrigues³

et al. 2012

COC

140

107

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Hydrogen peroxide is a substrate or side-product in many enzyme-catalyzed reactions. For example, it is a side-product of oxidases, resulting from the re-oxidation of FAD with molecular oxygen, and it is a substrate for peroxidases and other enzymes. However, hydrogen peroxide is able to chemically modify the peptide core of the enzymes it interacts with, and also to produce the oxidation of some cofactors and prostetic groups (e.g., the hemo group). Thus, the development of strategies that may permit to increase the stability of enzymes in the presence of this deleterious reagent is an interesting target. This enhancement in enzyme stability has been attempted following almost all available strategies: site-directed mutagenesis (eliminating the most reactive moieties), medium engineering (using stabilizers), immobilization and chemical modification (trying to generate hydrophobic environments surrounding the enzyme, to confer higher rigidity to the protein or to generate oxidation-resistant groups), or the use of systems capable of decomposing hydrogen peroxide under very mild conditions. If hydrogen peroxide is just a side-product, its immediate removal has been reported to be the best solution. In some cases, when hydrogen peroxide is the substrate and its decomposition is not a sensible solution, researchers coupled one enzyme generating hydrogen peroxide "in situ" to the target enzyme resulting in a continuous supply of this reagent at low concentrations thus preventing enzyme inactivation.This review will focus on the general role of hydrogen peroxide in biocatalysis, the main mechanisms of enzyme inactivation produced by this reactive and the different strategies used to prevent enzyme inactivation caused by this "dangerous liaison". Outlook

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Section: Use Of Metalsmentioning

confidence: 99%

Hydrogen Peroxide in Biocatalysis. A Dangerous Liaison

Hernández

Berenguer-Murcia²,

Rodrigues³

et al. 2012

COC

140

107

View full text Add to dashboard Cite

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“…The formation of by‐product 17 (Scheme ) can be explained by the scavenging of an ortho ‐bonded aryl intermediate by perhydroxide, as shown in Scheme . Adsorbed perhydroxide (PtOOH) is one of the expected intermediates in the decomposition of H 2 O 2 on platinum surfaces 22…”

Section: Resultsmentioning

confidence: 99%

Oxidative Coupling of 1‐Naphthols over Noble and Base Metal Catalysts

2013

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Bismuth‐promoted platinum catalysts were tested for the oxidative coupling of 2‐ and 4‐substituted 1‐naphthols at different temperatures and ambient pressure. The principal final products are the 3,3′‐substituted 1,1′‐binaphthalenylidene‐4,4′‐diones and the 4,4′‐substituted 2,2′‐binaphthalenylidene‐1,1′‐diones, respectively. Hydrogen peroxide was used as the oxidant. Only naphthols with electron‐donating substituents reacted. The corresponding binaphthalenyl diols can be considered as reaction intermediates. Yields of up to 99 % were obtained from 2‐methyl‐1‐naphthol as the starting material within 20 minutes. Probably for steric reasons, the diol is the final product obtained from 2‐ethyl‐1‐naphthol. For 4‐methoxy‐1‐naphthol the outcome is determined by the reaction temperature. At 25 °C the expected 1,1′‐dione is the major product, whereas at 60 °C 1′‐hydroxy‐4′‐methoxy‐2,2′‐binaphthalenyl‐1,4‐dione is formed; the loss of one methoxy unit and the preservation of the hydroxy group can be explained by the competitive cleavage of one of the two OMe bonds at higher temperature. Unpromoted platinum and a range of other metallic catalysts, including gold and Raney nickel, were also found to be active. The products obtained are brightly colored solids that could be used as dyes. The method described is truly catalytic and environmentally benign. The potential of the technique justifies further research to expand on the applicability of this novel method.

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“…(3) (Figure 2c could lead to catalytic site isolation and optimum negative charge distribution on the more electronegative Pt surface,w hich increases the catalytic rate of H 2 O 2 decomposition. [17] The increased surface area after Ag deposition also contributes to an increased H 2 O 2 decomposition rate on the SiO 2 /Pt surface. [18] Thec ommunication of two motors depends on the dissolution and deposition of silver in the H 2 O 2 solution.…”

Section: Innaturethe Communication Between Living Organisms Ismentioning

confidence: 99%

“…[16] Recent studies demonstrate the remarkable catalytic activity of bimetallic structures in several reactions. [17] According to EleyRideal mechanism for H 2 O 2 decomposition on an oble metal surface, the initial step involves the adsorption of one oxygen atom from H 2 O 2 on the catalytic site [Eq. (3) …”

Section: Innaturethe Communication Between Living Organisms Ismentioning

confidence: 99%

Bioinspired Chemical Communication between Synthetic Nanomotors

et al. 2017

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While chemical communication plays ak ey role in diverse natural processes,the intelligent chemical communication between synthetic nanomotors remains unexplored. The design and operation of bioinspired synthetic nanomotors is presented. Chemical communication between nanomotors is possible and has an influence on propulsion behavior.A chemical "message" is sent from am oving activator motor to anearby activated (receiver) motor by release of Ag + ions from aJ anus polystyrene/Ni/Au/Ag activator motor to the activated Janus SiO 2 /Pt nanomotor.T he transmitted silver signal is translated rapidly into adramatic speed change associated with the enhanced catalytic activity of activated motors.S elective and successive activation of multiple nanomotors is achieved by sequential localized chemical communications.The concept of establishing chemical communication between different synthetic nanomotors paves the way to intelligent nanoscale robotic systems that are capable of cooperating with eachother.

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Efficient hydrogen peroxide decomposition on bimetallic Pt–Pd surfaces

Cited by 55 publications

References 37 publications

Hydrogen Peroxide in Biocatalysis. A Dangerous Liaison

Hydrogen Peroxide in Biocatalysis. A Dangerous Liaison

Oxidative Coupling of 1‐Naphthols over Noble and Base Metal Catalysts

Bioinspired Chemical Communication between Synthetic Nanomotors

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