Mechanism and active sites for the partial oxidation of methanol to formaldehyde over an electrolytic silver catalyst

Waterhouse, Geoffrey I. N.; Bowmaker, Graham A.; Metson, James B.

doi:10.1016/j.apcata.2004.01.016

Cited by 69 publications

(127 citation statements)

References 60 publications

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“…5, and, for comparison, there were selected the most intense and characteristic (bench mark) bands for the expected silver compounds [2][3][4][5][6][7].…”

Section: Resultsmentioning

confidence: 99%

“…The wide bands with the clear maxima within the frequency range 200 to 600 cm -1 [2,5] The performed analysis of the Raman spectra of silver chemical compounds using the literature data caused the choice of the benchmark bands that were presented in Table. Table information obtained using the method of comparison of the obtained spectrum of porAg films and selected benchmark spectra of silver chemical compounds allow determining the possible nature of vibrations in the measured Raman spectra.…”

Section: Resultsmentioning

confidence: 99%

“…The accuracy of determination of the frequency of phonon bands was equal to 0.15 cm -1 . In this work, identification of silver chemical compounds in Ag NP shell in the por-Ag films by their vibrational bands in the Raman spectra was performed using the data of works [2][3][4][5][6][7]. The Raman spectra were mainly analyzed being based on comparison with the basic spectra presented in [2].…”

Section: Methodsmentioning

confidence: 99%

“…As a result, it was proposed the catalogue of Raman spectra of the mentioned silver compounds, which allows characterization of silver oxidation processes. Today a substantial amount of the works is devoted to Raman investigations, for example of the processes of chemical interaction of polycrystalline silver with О 2 , Н 2 О, СО 2 , ethylene, methanol [3], thermal dissociation of silver oxide [4], to study mechanisms of chemisorptions of oxygen on the silver analytic catalyzer [5], on the thermal-induced transformation of different silver oxides in the films of electrolytic silver [6], plasmon-active catalyzers of the reactions with H 2 , O 2 , CO, hydro-carbonates based on Ag/AgO x NPs [7], etc. But due to characterization by different set of silver compounds of the investigation objects prepared under different technological conditions, using these Raman spectra is rather limited, although they also contain much important information.…”

Section: Introductionmentioning

confidence: 99%

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Micro-Raman study of nanocomposite porous films with silver nanoparticles prepared using pulsed laser deposition

Strelchuk¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Nanocomposite porous films with silver nanoparticle (Ag NP) arrays were prepared by the pulsed laser deposition from the back flux of erosion torch particles in argon atmosphere on the substrate placed at the target plane. Preparation conditions of the films were set by argon pressure, energy density of laser pulses, their amount and substrate position relatively to the torch axis. The films were prepared with gradient thickness, variable Ag NP sizes and distance between them along the length of substrate as well as corresponding maxima in the spectra of local surface plasmon absorption. Plasmon effects of the Raman scattering enhance in the matter of the Ag NP shell gave the opportunity to register the spectral bands caused by an extremely small quantity of silver compounds with oxygen and carbon. The possible nature of individual bands in the Raman spectrum was analyzed. The obtained results are important for interpretation of the Raman spectra of analytes based on the prepared SERS substrates.

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“…5, and, for comparison, there were selected the most intense and characteristic (bench mark) bands for the expected silver compounds [2][3][4][5][6][7].…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Micro-Raman study of nanocomposite porous films with silver nanoparticles prepared using pulsed laser deposition

Strelchuk¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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“…CH 3 O (a) species may lead to the creation of formaldehyde (reaction 3) or CO 2 (reactions 4 and 5). Hydrogen atoms released in the various reaction steps (reactions 3-5) can be recombined to produce hydrogen 18 . CH 3 OH (a) + O (a) → CH3O (a) +OH (a) (1)…”

Section: Introductionmentioning

confidence: 99%

Oxidative decomposition of methanol in a vibroacoustic fluidized bed of Ag-coated cenosphere core-shell catalyst

Berkowicz

Żukowski

Baron

2016

Polish Journal of Chemical Technology

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The paper presents results of a study of oxidative decomposition of methanol in a fl uidized bed of silver catalyst. The process of methanol oxidation was carried out on Ag-coated cenospheres core-shell catalyst. The catalyst was obtained by precipitation of silver from methanolic solution of silver nitrate on cenospheres. Cenospheres are lightweight, inert, hollow spheres, which can be easily introduced into a fl uidized bed. Application of the catalyst in a form of fl uidized bed should ensure good temperature equalization which is very important at low temperatures due to the possibility of generation of formaldehyde. It turned out that local hot points occur in that kind of a catalyst (in the form of a fl uidized bed but with very low density), thus use of additional acoustic wave is necessary to ensure good control over the temperature of the process. The products of the process of methanol oxidation were monitored on-line by Fourier transform infrared spectroscopy (FTIR). The catalyst has proven to be highly active in the oxidative decomposition of methanol. Full of methanol conversion in reaction of complete oxidation was achieved at 350 o C.

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Catalytic Oxidations of Inorganic and Organic Compounds

Bartholomew

Farrauto²

2005

Fundamentals of Industrial Catalytic Processes

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Mechanism and active sites for the partial oxidation of methanol to formaldehyde over an electrolytic silver catalyst

Cited by 69 publications

References 60 publications

Micro-Raman study of nanocomposite porous films with silver nanoparticles prepared using pulsed laser deposition

Micro-Raman study of nanocomposite porous films with silver nanoparticles prepared using pulsed laser deposition

Oxidative decomposition of methanol in a vibroacoustic fluidized bed of Ag-coated cenosphere core-shell catalyst

Catalytic Oxidations of Inorganic and Organic Compounds

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