The adsorption of cyclohexanone on aluminum oxide  hydroxide powders in relation to its electrocatalytic hydrogenation

Laplante, François; Bouchard, Nicolas-Alexandre; Dubé, Patrick; Ménard, Hugues; Brossard, L.

doi:10.1139/v03-127

Cited by 8 publications

(14 citation statements)

References 16 publications

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“…The effect of the aluminate ion is more important in the supersaturated solution where the efficiency drops to less than 10%. Studies have shown that adsorption of organic molecules on the catalyst is a key parameter of ECH [14]. In situ modification of the catalyst surface by adsorption of molecules greatly influences the efficiency of ECH [19].…”

Section: Electrocatalytic Hydrogenation (Ech) Pathwaysmentioning

confidence: 99%

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Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Bouchard¹,

Brisach-Wittmeyer

Breault³

et al. 2007

J Appl Electrochem

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Selective reactions of catechol have been studied in regard to its inhibition properties towards alumina hydrate crystallization. Electrochemical reactions of the inhibitor leading to products without inhibition behaviour have been obtained using different conditions. First, a pure sodium hydroxide solution (1.0 M NaOH) was used to electrochemically react the catechol. The inhibitor reactions were then carried out in both saturated and supersaturated sodium aluminate solutions (NaAl(OH) 4 ). Electrocatalytic hydrogenation (ECH) of the aromatic ring over rhodium-based catalysts leads to the saturated non-inhibiting molecule, 1,2-cyclohexanediol. Temperature shows no significant influence on the ECH process within the temperature range where the alumina hydrate crystallization is normally carried out. The presence of aluminate ions in solution has, however, a detrimental effect on the current efficiency. Electro-oxidation of the catechol produces muconic acid by cleavage of the carbon-carbon bound. It also produces other oxidation products and, eventually, may lead to total mineralization of catechol into carbonate, which is a less inhibiting molecule. A detrimental effect of the presence of aluminate on the electro-oxidation is also observed. Electrochemical techniques are proposed as new pathways for organic control in caustic medium.

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Section: Electrocatalytic Hydrogenation (Ech) Pathwaysmentioning

confidence: 99%

“…This technique allows the testing of a broad family of catalysts in a short period of time. It was also possible to show a correlation between adsorption of the molecules on the catalyst and hydrogenation efficiencies [14].…”

Section: Introductionmentioning

confidence: 97%

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Bouchard¹,

Brisach-Wittmeyer

Breault³

et al. 2007

J Appl Electrochem

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“…Therefore, more emphasis is placed on improving the nature of the building material of the electrodes in order to increase ECH efficiency. A variety of materials have been developed; including: Raney Ni/Ni, Raney Ni/Hg pool, Pt/Pt, Pt/C, Rh/C [7], Pt/Pt and Pt/C with different concentrations of Pt [8]; different types of composite materials incorporated in reticulated vitreous carbon (RVC) like fractal nickel (Ni), crystalline nickel boride (Ni 2 B), and metallic nanoaggregates deposited on non-conductive powders like alumina, aluminum hydroxide, barium carbonate, and barium sulphate [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Competitive reactions such as production of molecular hydrogen can also take place (steps 5 or 6). Thus, in the case of supported electrocatalysts, the matrix (inorganic powder), which supports the metallic nanoaggregates and which monitors the adsorption of unsaturated molecules, was non-conductive until now [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of support conductivity of catalytic powder on electrocatalytic hydrogenation of phenol

et al. 2008

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Metallic nanoaggregates deposited on nonconductive oxides powders as catalysts have shown good efficiency in electrocatalytic hydrogenation (ECH). In this process, the polarization of the metallic nanoaggregates is very important. This polarization can be improved when the electrode material is conductive. Thus, the goal of this work was to study the effect of the conduction of the supported material on the ECH process. Tin dioxide was chosen as oxide because it can be obtained in non-conductive or conductive form by doping with fluorine. Palladium supported catalysts powders were prepared by the sol-gel method. These electrocatalysts were characterized by XRD, SEM, TGA/DSC, FTIR and electrical conductivity. The effects of temperature and time of calcination were also investigated. Comparison of nonconductive and conductive catalysts for ECH of phenol shows that conductive F-doped SnO 2 increases the rate of electrohydrogenation.

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“…The most frequent aim of the adsorption investigation is the removal of arsenic ions from drinking water [16][17][18]. Only several publications deal with the adsorption of organic compounds [24,25] or drugs [26,27].…”

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confidence: 99%

Absorbability of Highly Porous Aluminum Oxide Ceramics

Sinkó¹

2017

JMSE-A

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Highly porous aluminum oxide ceramics were synthesized by various low energy consumption techniques. This work demonstrates the efficiency of the preparation technique to tailor the structure of the materials. The drying method was varied and applied in vacuum (freeze drying), under supercritical conditions, and at atmospheric pressure. The pore system and the absorbability can be significantly affected by the conditions of the drying process. The absorbability of porous materials was compared basically for organic compounds. The gas and liquid adsorption measurements were carried out on a gas chromatography and mass spectrometry instrument. The absorbability of several porous aluminum oxide materials was compared to the adsorption data of pure carbon.

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The adsorption of cyclohexanone on aluminum oxide hydroxide powders in relation to its electrocatalytic hydrogenation

Cited by 8 publications

References 16 publications

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Effect of support conductivity of catalytic powder on electrocatalytic hydrogenation of phenol

Absorbability of Highly Porous Aluminum Oxide Ceramics

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The adsorption of cyclohexanone on aluminum oxide  hydroxide powders in relation to its electrocatalytic hydrogenation

Cited by 8 publications

References 16 publications

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Selective electrochemical reactions of an alumina hydrate crystallization inhibitor

Effect of support conductivity of catalytic powder on electrocatalytic hydrogenation of phenol

Absorbability of Highly Porous Aluminum Oxide Ceramics

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The adsorption of cyclohexanone on aluminum oxide hydroxide powders in relation to its electrocatalytic hydrogenation