Mechanisms for hydrogenation of acetone to isopropanol and of carbon oxides to methanol over copper-containing oxide catalysts

Yurieva, T. M.; Plyasova, L. M.; Макарова, О. В.; Krieger, Tamara

doi:10.1016/s1381-1169(96)00272-5

Cited by 60 publications

(31 citation statements)

References 12 publications

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“…An increase of the oxidation potential in the operating gas can lead to more spherical Cu particles with larger particle size. In contrast, flat dish-like Cu particles can be obtained when the operating gaseous condition is reduced as shown in Figure 1a [20,21]. The metallic copper model also argues that Cu-Zn alloy may play a role in the Cu/ZnO system, but Cu-Zn alloy is only formed at extreme reducing operating conditions.…”

Section: Copper-based Catalystsmentioning

confidence: 96%

Review on Copper and Palladium Based Catalysts for Methanol Steam Reforming to Produce Hydrogen

Shuai

2017

Catalysts

110

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Abstract:Methanol steam reforming is a promising technology for producing hydrogen for onboard fuel cell applications. The methanol conversion rate and the contents of hydrogen, carbon monoxide and carbon dioxide in the reformate, significantly depend on the reforming catalyst. Copper-based catalysts and palladium-based catalysts can effectively convert methanol into hydrogen and carbon dioxide. Copper and palladium-based catalysts with different formulations and compositions have been thoroughly investigated in the literature. This work summarized the development of the two groups of catalysts for methanol steam reforming. Interactions between the activity components and the supports as well as the effects of different promoters were discussed. Compositional and morphological characteristics, along with the methanol steam reforming performances of different Cu/ZnO and Pd/ZnO catalysts promoted by Al 2 O 3 , CeO 2 , ZrO 2 or other metal oxides, were reviewed and compared. Moreover, the reaction mechanism of methanol steam reforming over the copper based and palladium based catalysts were discussed.

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Section: Copper-based Catalystsmentioning

confidence: 96%

Review on Copper and Palladium Based Catalysts for Methanol Steam Reforming to Produce Hydrogen

Shuai

2017

Catalysts

110

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“…Cu 0 , Cu 1+ and a Cu/Zn alloy [1][2][3]. Depending on the gas phase and temperature, dynamic behaviour of the structure has been observed for which various models have been developed [4]: wetting/non-wetting phenomena of ZnO by metallic Cu [5], flat epitaxial Cu particles on top of ZnO balanced by dissolved protons [6], and coverage of Cu particles or mixed oxide by ZnO [7].…”

Section: Introductionmentioning

confidence: 99%

The effect of the reduction temperature on the structure of Cu/ZnO/SiO2 catalysts for methanol synthesis

Batyrev

Heuvel

Beckers

et al. 2005

Journal of Catalysis

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The effect of the reduction temperature on the structure of Cu/ZnO/SiO2 catalysts for methanol synthesis Batyrev, E.; van den Heuvel, J.C.; Beckers, J.; Jansen, W.P.A.; Castricum, H.L. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Abstract: The structure of Cu/SiO 2 and Cu/ZnO/SiO 2 catalysts was studied after reduction at 450-1300 K. The influence of the ZnO promoter on the exposed Cu surface area and metal cluster size was determined by N 2 O chemisorption and X-ray diffraction. After reduction at 450 K, the metal surface area amounted to 9 m 2 /g cat for both catalysts. Oxygen uptake during N 2 O chemisorption increased significantly up to reduction temperatures of 800-900 K. This increase was most prominent for the ZnO-promoted catalyst, although no oxygen uptake was observed for a similarly treated ZnO/SiO 2 sample. The behaviour of the promoted catalyst can be explained by formation of Zn 0 , surface alloying, and segregation of ZnO x species on top of Cu clusters. The high thermostability of the catalysts was confirmed by in-situ XRD measurements. The Cu crystallite size in both catalysts was about 4 nm, and did not increase when the reduction temperature was raised to 1100 K for 1 hour.

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“…In the study of the catalytic properties of the copper chromite CuCr 2 O 4 (normal tetragonal spinel; a = 6.033 Å, c = 7.782 Å, space group I 4 2d), it was shown that, in the hydrogenation of acetone into isopropyl alcohol (IPA), the maximum activity was observed at temperatures of its activation by hydrogen at 250-320°C. Therefore, we have studied this catalyst in detail in the conditions of interaction with hydrogen by in situ X-ray diffraction [83][84][85].…”

Section: A Study Of the Interaction Of Oxide Catalysts With Hydrogen mentioning

confidence: 99%

In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

Plyasova

Kardash

2012

J Struct Chem

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When characterizing the phase composition and structure of catalysts, researchers are faced with the problem of reversible effects of temperature and gas medium during their preparation, activation, or operation. Therefore, particular attention is paid to the methods of their research in appropriate conditions, i.e., in situ high-temperature X-ray diffraction. The theoretical framework and experimental features of high-temperature X-ray diffraction techniques are examined. Examples are given of their effective application to the study of the structural features of oxide catalysts under close-to-real conditions. Keywords: in situ high-temperature X-ray diffraction, thermal X-ray diffraction, oxide catalysts, phase composition, structure in the model conditions of preparation, activation, and operation.

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Mechanisms for hydrogenation of acetone to isopropanol and of carbon oxides to methanol over copper-containing oxide catalysts

Cited by 60 publications

References 12 publications

Review on Copper and Palladium Based Catalysts for Methanol Steam Reforming to Produce Hydrogen

Review on Copper and Palladium Based Catalysts for Methanol Steam Reforming to Produce Hydrogen

The effect of the reduction temperature on the structure of Cu/ZnO/SiO2 catalysts for methanol synthesis

In situ high-temperature X-ray diffraction measurements: Application to the study of heterogeneous catalysts

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