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Mallát, Tamás; Baiker, Alfons

doi:10.1023/a:1019132304828

Cited by 31 publications

(19 citation statements)

References 40 publications

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“…The recombination of the H ad on the surface is strongly hindered and an intermediate is going to be formed as XH species (in our case HCOO). These type of reactions obey often a simple radical mechanism without forming any ionic intermediates [32]. The cathodic charge transfer reactions are hydrogen adsorption (Volmer) and evolution reaction (Heyrowsky).…”

Section: Hcoo + H 2 O ! Hcooh + Ohmentioning

confidence: 99%

Reduction of CO2 under high pressure and high temperature on Pb-granule electrodes in a fixed-bed reactor in aqueous medium

Köleli

Balun

2004

Applied Catalysis A: General

101

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Section: Hcoo + H 2 O ! Hcooh + Ohmentioning

confidence: 99%

Reduction of CO2 under high pressure and high temperature on Pb-granule electrodes in a fixed-bed reactor in aqueous medium

Köleli

Balun

2004

Applied Catalysis A: General

101

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“…Besides acidity measurements the tested catalysts were characterized by several other methods (TEM, SEM, nitrogen adsorption, chemisorption) and by in-situ measurement of the electrochemical potential of the catalyst. This method [6] was used as an extra tool to obtain deeper insight into surface processes. When organic reactions are carried out with heterogeneous catalysts in the presence of a polar solvent, an electrochemical double-layer is formed on the metallic surface; in this double-layer charged species are balanced by an opposite charge of the metal.…”

mentioning

confidence: 99%

Lactose oxidation over palladium catalysts supported on active carbons and on carbon nanofibres

et al. 2009

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Liquid-phase lactose oxidation was investigated over supported Pd/C and Pd-carbon nanofibre catalysts, which were characterized by several methods. A complex relationship between catalyst activity and catalyst acidity was established, i.e. optimum catalyst acidity resulted in the highest activity in lactose oxidation. In-situ catalyst potential measurements during lactose oxidation gave information about the extent of accumulation of oxygen on the metal surface. These results could be correlated with catalyst deactivation, which was extensive over the most acidic catalysts at low reaction temperatures. Selectivity for the desired product, lactobionic acid, was a maximum of approximately 83% at 93% conversion. The main side-product was lactulose formed via isomerisation of lactose. Lower selectivity toward lactobionic acid was obtained when the rate of oxidation of lactose was low.

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“…a nitro compound), that shifts the mixed potential of the system. 216,217 In addition, the presence of a good ligand for the metal (typically N-, S-, and P-containing compounds and carboxylic acids) can stabilize the oxidized (ionic) state. Hydrogenolysis of a Cl-, Br-and I-containing solvent or substrate leads also to the stabilization of the metal ion in solution as halogen-complexes (in the order Cl o Br o I).…”

Section: 6mentioning

confidence: 99%

Reactions in “sacrificial” solvents

Mallát

Baiker

2011

Catal. Sci. Technol.

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The involvement of organic solvents in redox reactions and their influence on the efficiency and ''greenness'' of the desired chemical transformation are critically reviewed. Some representative examples are presented on the co-oxidation and co-reduction of widely used solvents (alcohols, ethers, nitriles, amides, sulfoxides, hydrocarbons, dense CO 2 ), and on the impact of these frequently hidden reactions. The transformation of the solvent may be limited to its unintended consumption leading to an increase in the E-factor, but it may also play a critical role in the reaction investigated and lead to false interpretation of reaction mechanisms. In fact, the approach of using a ''sacrificial'' solvent as a part of the oxidizing system may be an attractive-but surely not a green-alternative in synthetic chemistry. Finally, the crucial but often unrecognized role of the solvent in stabilizing or destabilizing catalytic metal nanoparticles is discussed. Surface redox reactions involving the solvent can be decisive for switching between heterogeneous and homogeneous catalytic pathways.

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Untitled

Cited by 31 publications

References 40 publications

Reduction of CO2 under high pressure and high temperature on Pb-granule electrodes in a fixed-bed reactor in aqueous medium

Reduction of CO2 under high pressure and high temperature on Pb-granule electrodes in a fixed-bed reactor in aqueous medium

Lactose oxidation over palladium catalysts supported on active carbons and on carbon nanofibres

Reactions in “sacrificial” solvents

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