Kinetics of ethylene combustion in the synthesis of vinyl acetate over a Pd/SiO2 catalyst

A kinetic study of vinyl acetate (VA) synthesis over a Pd(100) catalyst is described, and the effect of particle-size on this reaction ascertained by comparing the single crystal data with data from supported Pd catalysts (5 wt% Pd/SiO 2 , d Pd =4.2 nm, and 1 wt% Pd/SiO 2 , d Pd =2.5 nm). A negative reaction order with respect to ethylene and a positive order with respect to oxygen were found for the model and supported catalytic systems, whereas the catalytic stability was strongly dependent on the particle size. The mechanism for VA synthesis is proposed to be identical on all catalysts studied based on the similarities of the kinetic parameters. Carbon-containing species on the poisoned Pd(100) catalyst were investigated by X-ray photoelectron spectroscopy (XPS), and the coverage was estimated to be approximately 1.5 ML after VA synthesis.KEY WORDS: kinetics of vinyl acehate synthesis; Pd(100) catalysts.

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“…The present results are discussed in the context of previous data reported from our laboratories for VA synthesis [12][13][14].…”

Section: Introductionsupporting

confidence: 76%

Kinetic and Spectroscopic Studies of Vinyl Acetate Synthesis Over Pd(100)

et al. 2006

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“…It is one of the most used organic acids in the chemical industry [14]. The largest consumption of acetic acid is for the production of vinyl acetate [15], which is a monomer building block. About 33% of the world production of acetic acid in 2008 was used for the manufacture of vinyl acetate.…”

Section: Introductionmentioning

confidence: 99%

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

Lomate

Katryniok

Dumeignil

et al. 2015

sustain chem process

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In this paper, we report for the first time a one-pot reaction enabling total transformation of lactic acid to acetic acid over a Mo-V-Nb mixed oxide catalyst having an optimal atomic ratio 19:5:1. The mechanism of the reaction consists in two parallel ways leading to acetic acid: (i) oxi-dehydrogenation of lactic acid to pyruvic acid followed by decarboxylation and (ii) decarbonylation of lactic acid to acetaldehyde followed by oxidation. In the operating conditions we used, the catalyst is very active (total conversion of lactic acid) and selective towards acetic acid (100% selectivity). A 100% yield into acetic acid is hence obtained.

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“…The increase of the reaction rate with increase of cationic property of a metal attached to acetate (as in promoters) is another reason consistent with the given postulation. Moreover, if metallic acetate promoters were to form a layer on the catalyst surface as proposed by Augustine et al, 9 the effect of such promoters on the reaction rate must be reduced with the increase of cationic property from the top elements of the alkali group to the bottom due to higher dissociation and reduction of acetic acid concentration, however this is not the case as presented from above observation in this work. In addition to theories provided in the discussion part on the effect of Au in the palladium catalyst by Chen et al, 24 our observation also complies with this theory while suggesting that Au imposes the distribution of palladium particles by decreasing the particle's diameter.…”

Section: Effect Of Promoters On Ethylene Conversion and Selectivitymentioning

confidence: 57%

Effect of Acetate Promotor on the Pd-Au/SiO₂-catalyzed Synthesis of Vinyl Acetate from the Reaction of Ethylene with Acetic Acid

Atashi¹,

Motahari²,

Tabrizi³

et al. 2011

Journal of the Korean Chemical Society

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ABSTRACT. The effect of Group I alkali acetate promoters on vinyl acetate (VA) synthesis was evaluated. Catalyst product selectivity and ethylene conversion are compared to the unpromoted catalyst in the fixed-bed reactor with oxidation reaction of ethylene and acetic acid in gaseous phase over Pd-Au/SiO2 catalyst. It was found that: a) the promoters were stabilized on the catalyst surface, b) common effect for the alkali promoted Pd-Au catalysts increaseed in product selectivity and ethylene conversion compared to unpromoted catalyst (these effects increase from top to the bottom of Group I). These promoting effect is due to the common-ion effect of acetate, present in the reaction, resulting in an increase in the activity of the catalyst. In addition a complementary theory for the effect of Au in the structure of the catalyst is proposed the imposition of distribution of palladium particles through decreasing the particle's diameter.

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Kinetics of ethylene combustion in the synthesis of vinyl acetate over a Pd/SiO2 catalyst

Cited by 69 publications

References 52 publications

Kinetic and Spectroscopic Studies of Vinyl Acetate Synthesis Over Pd(100)

Kinetic and Spectroscopic Studies of Vinyl Acetate Synthesis Over Pd(100)

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

Effect of Acetate Promotor on the Pd-Au/SiO₂-catalyzed Synthesis of Vinyl Acetate from the Reaction of Ethylene with Acetic Acid

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Kinetics of ethylene combustion in the synthesis of vinyl acetate over a Pd/SiO2 catalyst

Cited by 69 publications

References 52 publications

Kinetic and Spectroscopic Studies of Vinyl Acetate Synthesis Over Pd(100)

Kinetic and Spectroscopic Studies of Vinyl Acetate Synthesis Over Pd(100)

High yield lactic acid selective oxidation into acetic acid over a Mo-V-Nb mixed oxide catalyst

Effect of Acetate Promotor on the Pd-Au/SiO2-catalyzed Synthesis of Vinyl Acetate from the Reaction of Ethylene with Acetic Acid

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Effect of Acetate Promotor on the Pd-Au/SiO₂-catalyzed Synthesis of Vinyl Acetate from the Reaction of Ethylene with Acetic Acid