Kinetics of vapor-phase oxidation of methanol on reduced silver catalyst

Bhattacharyya, Souvik; Nag, Nabinkrishna; Ganguly, N.D.

doi:10.1016/0021-9517(71)90037-6

Cited by 24 publications

(13 citation statements)

References 6 publications

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“…Indeed, many catalytic processes exist which occur either directly on or through the intimate involvement of a metal oxide phase; several (e.g., methanol synthesis, automotive exhaust combustion, etc.) are of great practical significance. − The breadth of oxygenate catalysis arises in part from the slate of adsorbed species which may be found on metal oxides. Alcohols typically form surface alkoxides − while carboxylic acids often result in carboxylate formation − via simple dissociative adsorption.…”

Section: Introductionmentioning

confidence: 99%

Competition between Acetaldehyde and Crotonaldehyde during Adsorption and Reaction on Anatase and Rutile Titanium Dioxide

1999

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The adsorption of acetaldehyde and crotonaldehyde on the anatase and rutile polymorphs of TiO2 has been investigated with Fourier transform infrared spectroscopy (FTIR). Chemisorption of acetaldehyde on TiO2 involves a strong interaction between the surface and the carbonyl oxygen, causing a significant shift in the location of the ν(CO) vibrational mode to lower frequencies; no interaction with surface hydroxyl groups was observed. Capacities for acetaldehyde and crotonaldehyde adsorption under conditions relevant to aldolization reactions were determined in a novel reactor system providing simultaneous mass measurements and mass spectral analysis of gas-phase products. The coverage of acetaldehyde irreversibly adsorbed on TiO2 was similar to values previously reported for the adsorption of alcohols; coverages of crotonaldehyde were approximately 60% of those for acetaldehyde. Both gas-phase and surface analyses indicate that formation of crotonaldehyde by aldol condensation of acetaldehyde occurs on rutile TiO2 at temperatures as low as 313 K. This reaction was not observed on anatase at these conditions; higher temperatures were required. The production of crotonaldehyde on rutile at 313 K diminished with increasing exposure of acetaldehyde. Acetaldehyde and crotonaldehyde adsorbed in a similar fashion on both anatase and rutile, and either aldehyde could displace the other from the surface layer. Accordingly, the surface concentrations of adsorbed acetaldehyde and crotonaldehyde mirror those in the gas phase. Upon heating an adsorbed layer of acetaldehyde, small amounts of ethoxide and acetate species were formed, possibly from a Cannizzaro-type disproportionation reaction. The similarity of these results to those of studies on TiO2 single crystals illustrates the applicability of properly chosen metal oxide single-crystal surfaces as models for polycrystalline powders. Both demonstrate that the chemistry of aldehydes on TiO2 can be successfully explained in terms of the reactions of a few key surface species.

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Section: Introductionmentioning

confidence: 99%

Competition between Acetaldehyde and Crotonaldehyde during Adsorption and Reaction on Anatase and Rutile Titanium Dioxide

1999

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“…Water plays an important role in increasing the selectivity towards the desired product [6,[8][9][10]. The addition of water or not at reactor feed differ the two major variation of formaldehyde industrial process: Water Ballast Process and Methanol Ballast Process, respectively.…”

Section: Introductionmentioning

confidence: 99%

Hybrid training approach for artificial neural networks using genetic algorithms for rate of reaction estimation: Application to industrial methanol oxidation to formaldehyde on silver catalyst

Filho

2010

Chemical Engineering Journal

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“…[8][9][10] There exist various kinetic studies of MeOH oxidation on different catalysts. [11][12][13][14][15][16][17][18] The main product mentioned in the literature is FA because of its industrial interest. Nevertheless, important quantities of dimethyl ether (DME), dimethoxymethane (DMM), and MF have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…The apparent activation energies reported are about 20 kcal/mol. 1,13,15,17 The rate-determining step (RDS) in FA formation determined by isotopic kinetic measurement is the breaking of the C-H bond from an adsorbed methoxy group to produce an adsorbed FA form. 18 Several authors have investigated the effect of W as an inhibitor of MeOH oxidation.…”

Section: Introductionmentioning

confidence: 99%

“…The apparent kinetic orders found in O 2 and MeOH have been positive in most cases. Their values depended on the kind of catalyst and on the experimental conditions in which the kinetic study was performed (conversion, temperature, and pressure range). − However, Pernicone et al , have reported that by using pure MoO 3 and MoO 3 −Fe 2 (MoO 4 ) 3 catalysts the reaction rate of MeOH oxidation does not depend on the partial pressures of the reactants, except for the lowest ones.…”

Section: Introductionmentioning

confidence: 99%

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Partial Oxidation of Methanol on a Sn−Mo−O Catalyst. A Kinetic Study

Ardissone

Valente

Cadús

et al. 2000

Ind. Eng. Chem. Res.

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A Sn-Mo-O catalyst was prepared, characterized, and tested in the partial oxidation of methanol under different experimental conditions. A kinetic model which assumes that the reaction involves different active sites such as terminal and bridged oxygen vacancy sites, terminal oxygen (ModO), and dual dioxo sites (two adjacent surface dioxo units) has been selected. The experimental observations and the predictions of the model show a rather good agreement.

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Kinetics of vapor-phase oxidation of methanol on reduced silver catalyst

Cited by 24 publications

References 6 publications

Competition between Acetaldehyde and Crotonaldehyde during Adsorption and Reaction on Anatase and Rutile Titanium Dioxide

Competition between Acetaldehyde and Crotonaldehyde during Adsorption and Reaction on Anatase and Rutile Titanium Dioxide

Hybrid training approach for artificial neural networks using genetic algorithms for rate of reaction estimation: Application to industrial methanol oxidation to formaldehyde on silver catalyst

Partial Oxidation of Methanol on a Sn−Mo−O Catalyst. A Kinetic Study

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