Catalytic Oxidation of Glucose on Bismuth-Promoted Palladium Catalysts

Бессон, М.; Lahmer, F.; Gallezot, P.; Fuertès, Patrick; Flèche, G.

doi:10.1006/jcat.1995.1065

Cited by 224 publications

(135 citation statements)

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“…Furthermore, the product distribution can be influenced by the use of promoter [3,6]. Besson et al [7] showed an increase of the reaction rate with bimetallic catalysts (Pd-Bi/C). They assumed that over-oxidation is avoided by bismuth because of the higher affinity towards oxygen compared to platinum metal catalyst.…”

Section: Introductionmentioning

confidence: 98%

Kinetic Study of Heterogeneously Catalyzed Glucose Oxidation in a Stirred Cell

Ablasser

Hilger

Hinrichsen

2014

Chemie Ingenieur Technik

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Liquid phase oxidation of glucose to gluconic acid using Bi promoted Pd catalysts was studied in a stirred cell. Gas-liquid mass transfer limitations are observed at lower but not at higher rotational speeds. The conversion and the deactivation of the Pd catalyst depend on the O 2 concentration in the liquid phase. With decreasing glucose concentration, the reaction rate decreases leading to higher oxygen concentration in the liquid, which deactivates the catalyst due to over-oxidation.Severe mass transfer limitations even at low Pd loadings could be attributed to intraparticle or liquid-to-solid mass transfer.

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Section: Introductionmentioning

confidence: 98%

Kinetic Study of Heterogeneously Catalyzed Glucose Oxidation in a Stirred Cell

Ablasser

Hilger

Hinrichsen

2014

Chemie Ingenieur Technik

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“…[7,8] Doped with small amounts of Bi, the catalytic activity was improved, but the partial leaching observed from the catalyst surface into the reaction medium is not appropriate for food or pharmaceutical applications. [9,10] Some traces of byproducts were also obtained.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Selective Oxidation of D‐Glucose into Gluconic acid under Low‐Frequency Ultrasonic Irradiation

2014

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The subtle interplay of several different effects means that the interpretation and analysis of experimental spectra in terms of structural and dynamic characteristics is a challenging task. In this context, theoretical studies can be helpful, and as such, computational spectroscopy is rapidly evolving from a highly specialized research field toward a versatile and widespread tool. However, in the case of electronic spectra (e.g. UV/Vis, circular dichroism, photoelectron, and X‐ray spectra), the most commonly used methods still rely on the computation of vertical excitation energies, which are further convoluted to simulate line shapes. Such treatment completely neglects the influence of nuclear motions, despite the well‐recognized notion that a proper account of vibronic effects is often mandatory to correctly interpret experimental findings. Development and validation of improved models rooted into density functional theory (DFT) and its time‐dependent extension (TD‐DFT) is of course instrumental for the optimal balance between reliability and favorable scaling with the number of electrons. However, the implementation of easy‐to‐use and effective procedures to simulate vibrationally resolved electronic spectra, and their availability to a wide community of users, is at least equally important for reliable simulations of spectral line shapes for compounds of biological and technological interest. Here, such an approach has been applied to the study of the UV/Vis spectra of chlorophyll a. The results show that properly tailored approaches are feasible for state‐of‐the‐art computational spectroscopy studies, and allow, with affordable computational resources, vibrational and environmental effects on the spectral line shapes to be taken into account for large systems.

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“…The dependence of the reaction by the pH rate is determined by the fact that in basic conditions, the carbohydrate is present in the open linear form, in which it is present an aldehyde group, which is much more reactive towards oxidation than hydroxyl. The selectivity problems can be overcome by promoting catalysis, by the Pt or Pd [18], with metals such as Bi or Pb, but these catalysts are not stable since they suffer from leaching.…”

Section: Introductionmentioning

confidence: 99%

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

et al. 2016

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Abstract:New gold catalysts supported on CeO 2 , ZrO 2 and TiO 2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60˝C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts' activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too.

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Catalytic Oxidation of Glucose on Bismuth-Promoted Palladium Catalysts

Cited by 224 publications

References 0 publications

Kinetic Study of Heterogeneously Catalyzed Glucose Oxidation in a Stirred Cell

Kinetic Study of Heterogeneously Catalyzed Glucose Oxidation in a Stirred Cell

Efficient and Selective Oxidation of D‐Glucose into Gluconic acid under Low‐Frequency Ultrasonic Irradiation

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

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