FT-IR study of methanol, formaldehyde and methyl formate adsorption on the surface of Mo/Sn oxide catalyst

Lochař, Václav

doi:10.1016/j.apcata.2006.04.030

Cited by 71 publications

(61 citation statements)

References 10 publications

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“…Upon adsorption at room temperature, surface -OCH 3 species was readily formed by condensation of methanol with surface OH of the catalyst. The bands at 2,930 and 2,821 cm -1 corresponded to the bond vibration of m s (CH 3 ) and the Fermi resonance of 2d s (CH 3 ), respectively, in the methoxy group [5,[13][14][15][16][17][18]. The bands at 2,955 and 2,849 cm -1 could be assigned to the same mode occurring in the undissociatively adsorbed methanol.…”

Section: Methanol Oxidationmentioning

confidence: 83%

Methanol Selective Oxidation to Methyl Formate over ReOx/CeO2 Catalysts

et al. 2007

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Methanol selective oxidation to methyl formate was investigated over ReO x /CeO 2 catalysts in terms of Re loading and reaction mechanism. It was found that Re loading with monolayer dispersion on ceria exhibited promising reaction rate of methanol of 16 mmol g cat.-1 h -1 and methyl formate selectivity of about 90% at 513 K. The surface reaction of methanol, formaldehyde, and methyl formate over the ReO x /CeO 2 catalyst was investigated by in situ Fourier transform infrared spectroscopy and it was revealed that the formate species, formed by the oxidation of adsorbed -OCH 3 species, could act as the key reaction intermediate, which further reacted with gaseous methanol to form methyl formate and/or decompose into CO and CO 2 , depending on the reaction temperature.

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Section: Methanol Oxidationmentioning

confidence: 83%

Methanol Selective Oxidation to Methyl Formate over ReOx/CeO2 Catalysts

et al. 2007

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“…The band of adsorbed methane shows an increasing trend during the reaction. There are also other peaks in these regions which are indexed to other compounds and were detected in very small amounts in GC-MS (as mentioned above): methyl formate (MF) 39,50,51 , ethyl methyl ether (EME) 52 , ethanol [53][54][55] , propane [56][57][58] and butane 59 . This can be the result of random formation in the gas phase rather than the catalyst's activity.…”

Section: Resultsmentioning

confidence: 99%

Time evolution of the CO2 hydrogenation to fuels over Cu-Zr-SBA-15 catalysts

Atakan

Erdtman

Mäkie

et al. 2018

Journal of Catalysis

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The self-archived postprint version of this journal article is available at Linköping University Institutional Repository (DiVA): http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-147297 N.B.: When citing this work, cite the original publication.Atakan, A., Erdtman, E., Mäkie, P., Ojamäe, L., Odén, M., (2018) ABSTRACT: Time evolution of catalytic CO2 hydrogenation to methanol and dimethyl ether (DME) has been investigated in a hightemperature high-pressure reaction chamber where products accumulate over time. The employed catalysts are based on a nano-assembly composed of Cu nanoparticles infiltrated into a Zr doped SiOx mesoporous framework (SBA-15): Cu-Zr-SBA-15. The CO2 conversion was recorded as a function of time by gas chromatography-mass spectrometry (GC-MS) and the molecular activity on the catalyst's surface was examined by diffuse reflectance in-situ Fourier transform infrared spectroscopy (DRIFTS). The experimental results showed that after 14 days a CO2 conversion of 25% to methanol and DME was reached when a DME selective catalyst was used which was also illustrated by thermodynamic equilibrium calculations. With higher Zr content in the catalyst, greater selectivity for methanol and a total 9.5 % conversion to methanol and DME was observed, yielding also CO as an additional product. The time evolution profiles indicated that DME is formed directly from methoxy groups in this reaction system. Both DME and methanol selective systems show the thermodynamically highest possible conversion.

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“…Once again acetates appear under reaction, as evidenced by the peak at 1444 cm -1 . In addition, peaks at 1566 and 1369 cm -1 are identified as belonging to the m asym (OCO) and m sym (OCO) stretch of adsorbed formate [38]. Formate has been identified as a potential intermediate in methanol synthesis catalysts, which suggests that at a reaction temperature of 180°C, the addition of Fe to Rh/ TiO 2 improves the catalyst's ability to produce methanol.…”

Section: Co Hydrogenation On Ferh/tio 2 and Ferh/ Ceomentioning

confidence: 97%

Infrared Spectroscopy Investigation of Fe-Promoted Rh Catalysts Supported on Titania and Ceria for CO Hydrogenation

Magee¹,

Palomino²,

White³

2016

Catal Lett

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The nature of the promotional effect of Fe addition to Rh/TiO 2 and Rh/CeO 2 catalysts for CO hydrogenation was investigated using FT-IR spectroscopy in an ultrahigh vacuum compatible transmission IR cell. CO adsorption experiments on Rh and FeRh showed vibrational signatures characteristic of linear and bridge bound CO on Rh 0 as well as geminal-dicarbonyl species associated with Rh ? . Compared to TiO 2 , the CeO 2 -supported catalysts show increased dispersion, reflected by decreased particle size, and a lower signal for linear versus geminal-dicarbonyl bonded CO . The absorption frequencies for CO on Rh/CeO 2 are also redshifted relative to Rh/ TiO 2 , which results from a weaker Rh-CO interaction, likely due to the increased reducibility of the CeO 2 support. Upon addition of Fe, a new spectral feature is observed and attributed to CO bound to Rh in close contact with Fe, likely as a surface alloy. CO hydrogenation on (Fe)Rh catalysts on both supports was also studied. Compared to bare Rh, Fe containing catalysts promote formate and methoxy species on the surface at lower temperature (180°C), which suggests an enhancement in methanol selectivity by Fe addition. At higher temperatures (220°C), the spectral features appear similar, further confirming the role of Fe as a disrupter of large Rh 0 crystallites and regulator of CO dissociation and CH 4 formation. Graphical Abstract

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FT-IR study of methanol, formaldehyde and methyl formate adsorption on the surface of Mo/Sn oxide catalyst

Cited by 71 publications

References 10 publications

Methanol Selective Oxidation to Methyl Formate over ReOx/CeO2 Catalysts

Methanol Selective Oxidation to Methyl Formate over ReOx/CeO2 Catalysts

Time evolution of the CO2 hydrogenation to fuels over Cu-Zr-SBA-15 catalysts

Infrared Spectroscopy Investigation of Fe-Promoted Rh Catalysts Supported on Titania and Ceria for CO Hydrogenation

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