Particle size effects in vinyl acetate synthesis over Pd/SiO

Han, Yi‐Fan; Kumar, Deepak; Goodman, D. W.

doi:10.1016/j.jcat.2004.12.018

Cited by 99 publications

(84 citation statements)

References 27 publications

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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%

“…The Pd-5 and Pd-1 catalysts, at 443 K and p O 2 =7.6 Torr, p C 2 H 4 =57.0 Torr, p AcOH =12.0 Torr, showed a $120 min induction period after which the rates became stable. TEM shows the average particle size of Pd to be 4.2 and 2.5 nm for the Pd-5 and Pd-1 catalysts, respectively [12]. These results show that the stability of the catalysts is independent of the Pd particle size.…”

Section: Kineticsmentioning

confidence: 73%

“…The reaction was carried out in a micro fixed-bed reactor connected to an online GC. The methodology for preparation of the supported catalyst and carrying out the reactivity measurements have been described in detail elsewhere [12,14]. The morphology, particle size, and chemical composition of the Pd catalysts, both fresh and used, were determined using transmission electron microscopy (TEM), X-ray diffraction (XRD) and XPS.…”

Section: Supported Catalystsmentioning

confidence: 99%

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

et al. 2006

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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%

Section: Kineticsmentioning

confidence: 73%

Section: Supported Catalystsmentioning

confidence: 99%

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

et al. 2006

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“…Pd is an active catalyst for the acetoxylation of ethylene to vinyl acetate (VA), see equation (1) [2,3,[24][25][26][27][28][29][30][31][32][33][34][35][36]. However Pd is also an active catalyst for the combustion of ethylene and acetic acid and thus exhibits a low selectivity for VA synthesis (equations (2) and (3) 3) The addition of small amounts of Au to a supported Pd catalysts can significantly enhance its selectivity and activity for this reaction, as shown in Fig.…”

mentioning

confidence: 99%

“…However Pd is also an active catalyst for the combustion of ethylene and acetic acid and thus exhibits a low selectivity for VA synthesis (equations (2) and (3) 3) The addition of small amounts of Au to a supported Pd catalysts can significantly enhance its selectivity and activity for this reaction, as shown in Fig. 1 [2,3,[28][29][30][31]. Silica supported Pd-Au bimetallic catalysts promoted with potassium acetate have been used as commercial catalysts for VA synthesis for more than 40 years.…”

mentioning

confidence: 99%