Characterization of dioxymethylene species over cu-zn catalysts

Idriss, Hicham; Hindermann, J. P.; Kieffer, R.; Kiennemann, A.; Vallet, Ana; Chauvin, Camille; Lavalley, Jean‐Claude; Chaumette, P.

doi:10.1016/0304-5102(87)85027-7

Cited by 44 publications

(20 citation statements)

References 20 publications

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“…Recent studies agree that CO 2 rather than CO is the direct precursor to CH 3 OH on Cu-containing catalysts, based on the initial appearance of 13 CH 3 OH from CO/ 13 CO 2 /H 2 mixtures [6], on infrared spectra of adsorbed intermediates [7,8], and on transient kinetic studies [9]. It has even been reported that methanol synthesis from mixtures of H 2 and CO does not occur on Cu/SiO 2 [10].…”

Section: Introductionmentioning

confidence: 90%

New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

Meitzner¹,

Iglesia

1999

Catalysis Today

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X-ray absorption spectroscopic studies from several different groups provide a consistent structural picture of methanol synthesis catalysts. Copper metal is the principal Cu species detected in all in-situ XAS studies. A small amount of Cu(II) persisted in many samples reduced below 600 K, but it appears to be catalytically irrelevant. Cu(I) was not detected in any of the in-situ XAS studies. The Zn structure did not change in response to chemical treatments in any of the ZnO-containing methanol synthesis catalysts.We conclude that the slow approach to steady-state rate of methanol synthesis from CO/H 2 mixtures cannot result from changes in the Cu metal component of Cu/SiO 2 catalysts. By eliminating this possibility, we provide indirect evidence for the proposal that initial induction periods reflect slow changes in the surface of the SiO 2 or ZnO component in the catalysts. A bifunctional mechanism involving the formation of formate from CO on support hydroxyl groups would increase methanol synthesis rates as OH groups are formed by hydrolysis of Si-O bonds using the H 2 O formed in slow methanation side reactions. The bifunctional mechanism is not required for the synthesis of methanol from CO 2 -containing mixtures, because formate can form on Cu directly from CO 2 and H 2 .

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Section: Introductionmentioning

confidence: 90%

New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

Meitzner¹,

Iglesia

1999

Catalysis Today

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“…This shows that, under these conditions, the reduced catalyst provides some hydrogen to CO giving rise to most steps of methanol synthesis. The component at 1113 cm −1 may be associated to the CO stretching of a dioxymethylene species [44,45], which may be an intermediate in methoxy groups formation.…”

Section: Ir Study Of High Temperature Co Adsorptionmentioning

confidence: 98%

An IR study of methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

Vargas

Busca

Costantino

et al. 2007

Journal of Molecular Catalysis A: Chemical

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“…As formaldehyde is either the product or an intermediate of important organic catalytic reactions [1][2][3][4][5][6], its adsorption and reaction have been frequently studied on single crystal surfaces of metal oxides [7][8][9][10][11], on polycrystalline oxides [12][13][14] and on single crystal metal surfaces [13,[15][16][17].…”

Section: Introductionmentioning

confidence: 99%

FTIR and mass spectrometric studies on the interaction of formaldehyde with TiO2 supported Pt and Au catalysts

Kecskés

Raskó

Kiss

2004

Applied Catalysis A: General

131

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The interaction of formaldehyde with Pt/TiO 2 and Au/TiO 2 catalysts was investigated at 300-473 K by Fourier transform infrared spectroscopy and mass spectrometry. The effects of the pretreatments and the metal content of the catalysts, as well as the effects of the reaction temperature on the formation of the surface species and on the gas phase products were studied. Molecularly adsorbed formaldehyde, formic acid, formate, dioxymethylene and polyoxymethylene surface species are formed during formaldehyde adsorption at 300-473 K. The main gas phase products were H 2 and CO; their amounts increased with the increase of the metal content of the catalysts and with the increase of the reaction temperature. Gas phase ethylene, acetylene, as well as formic acid were detected on pure TiO 2. On metal-containing TiO 2 no ethylene, acetylene and formic acid were observed, which could be connected with the limited surface concentration of oxygen vacancies on these surfaces.

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Characterization of dioxymethylene species over cu-zn catalysts

Cited by 44 publications

References 20 publications

New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

New insights into methanol synthesis catalysts from X-ray absorption spectroscopy

An IR study of methanol steam reforming over ex-hydrotalcite Cu–Zn–Al catalysts

FTIR and mass spectrometric studies on the interaction of formaldehyde with TiO2 supported Pt and Au catalysts

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