Desorption of Dimethyl Ether from a Methoxy Species Formed on a CeO<sub>2</sub> Surface

Hara, Michikazu; Kawamura, Miyuki; Kondo, Junko N.; Domen, and Kazunari; Maruya, Ken‐ichi

doi:10.1021/la960364y

Cited by 2 publications

(4 citation statements)

References 15 publications

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“…We may assign these to dimethyl ether CH 3 OCH 3 and its fragments A similar reaction was reported by Hara et al for the methoxyl species on the CeO 2 surface . The FT-IR spectral changes do not clearly show the presence of these species after heating in these temperature ranges.…”

Section: Resultssupporting

confidence: 78%

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Interaction of Alcohols with Surface Hydroxyls on Chromium(III) Oxide

Kittaka¹,

Umezu²,

Ogawa³

et al. 1998

Langmuir

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Physical and chemical adsorption of methanol and ethanol on the hydroxylated chromium oxide surface was studied. Surface hydroxyls were classified into three groups according to their reactivity with alcohols. Both methanol and ethanol are physisorbed on the first group surface hydroxyls which can be adsorption sites for H2O molecules giving rise to the two-dimensional (2D) condensation. The second ones are active hydroxyls for H2O adsorption and also are reactive with alcohol adsorption to give surface alkoxides. The third one is inactive to both alcohol and H2O adsorptions. Upon heating, chemisorbed alcohols are desorbed at first as molecules by recombination of alkoxyls and hydroxyls. Surface reactions occurred to give the dimethyl ether and ethylene from surface methoxide. Molecular ethanol is desorbed from the surface ethoxide as in the case from surface methoxide. Ejection of ethylene is remarkable after molecular ethanol desorption. Butene and its fragments are observed in a desorbed gas with molecular methanol, indicating that a combination reaction of decomposition products occurs on the chromium oxide surface.

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Section: Resultssupporting

confidence: 78%

“…A similar reaction was reported by Hara et al for the methoxyl species on the CeO 2 surface. 23 The FT-IR spectral changes do not clearly show the presence of these species after heating in these temperature ranges. The oxygen which is evolved as the fragment of CO 2 should be extracted from the metal oxide surface.…”

Section: Resultsmentioning

confidence: 93%

Interaction of Alcohols with Surface Hydroxyls on Chromium(III) Oxide

Kittaka¹,

Umezu²,

Ogawa³

et al. 1998

Langmuir

View full text Add to dashboard Cite

show abstract

“…There were three desorption peaks at 370-380, 470-500, and 570 K in the spectra of the DME-adsorbed CeO 2 , and all three desorption peaks were the desorption of DME. 1,2 The desorption peak at 470-500 K as a major peak increased in intensity, shifting to lower temperatures with increasing DME exposure. 1,2 Such a desorption is explained well in terms of second-order desorption.…”

mentioning

confidence: 99%

“…1,2 The desorption peak at 470-500 K as a major peak increased in intensity, shifting to lower temperatures with increasing DME exposure. 1,2 Such a desorption is explained well in terms of second-order desorption. 3 The equation of Redhead for secondorder desorption indicates that the increase of the amount of mobile adsorbate results in the recombination between adsorbates at lower temperature.…”

mentioning

confidence: 99%