The structure sensitivity of cyclohexane dehydrogenation and hydrogenolysis catalyzed by platinum single crystals at atmospheric pressure

Gillespie, Walter D.; Herz, Richard K.; Petersen, Eugene E.; Somorjai, Gábor A.

doi:10.1016/0021-9517(81)90297-9

Cited by 119 publications

(40 citation statements)

References 26 publications

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“…In contrast, the PDSP support is physically rigid and provides stable immobilization of the PtNPs without removal or agglomeration under the reaction conditions for cyclohexane dehydrogenation and maintains the catalytic activity. It should be noted that cyclohexane dehydrogenation at Pt is known to be a structure-sensitive reaction 36 . However, in the present case, the Pt particle size estimated by XRD was larger than the particle size range where the particle size effect on the catalytic activity is apparent (1–4 nm) 36 .…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that cyclohexane dehydrogenation at Pt is known to be a structure-sensitive reaction 36 . However, in the present case, the Pt particle size estimated by XRD was larger than the particle size range where the particle size effect on the catalytic activity is apparent (1–4 nm) 36 . Thus, per-site activity at least in the initial stage should be comparable between PtNP@PDSP and Pt/C catalysts.…”

Section: Resultsmentioning

confidence: 99%

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Platinum Nanoparticle-embedded Porous Diamond Spherical Particles as an Active and Stable Heterogeneous Catalyst

Kondo

Morimura

Tsujimoto

et al. 2017

Sci Rep

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Platinum nanoparticle-embedded porous diamond spherical particles (PtNP@PDSPs), as an active and stable catalyst, were fabricated by spray-drying of an aqueous slurry containing nanodiamond (ND) particles, platinum nanoparticles (PtNP), and polyethylene glycol (PEG) to form ND/PtNP/PEG composite spherical particles, followed by removal of PEG and a short-time diamond growth on the surface. The average diameter of the PtNP@PDSPs can be controlled in the range of 1–5 μm according to the spray-drying conditions. The Brunauer-Emmett-Teller (BET) surface area and average pore diameter of the PtNP@PDSPs were estimated to be ca. 170–300 m2 g−1 and ca. 4–13 nm, respectively. When ND with the size of 20–30 nm was used, the size of PtNP in the PtNP@PDSP was almost unchanged at 5–6 nm even after high temperature processes and reuse test for catalytic reaction, showing stable supporting. The catalytic activity of the PtNP@PDSPs for the dehydrogenation of cyclohexane was higher than that for a Pt/C catalyst, which is attributed to the stable PtNP support by the three-dimensional packing of ND and efficient mass transfer via the interconnected through-hole pores in the PDSPs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Platinum Nanoparticle-embedded Porous Diamond Spherical Particles as an Active and Stable Heterogeneous Catalyst

Kondo

Morimura

Tsujimoto

et al. 2017

Sci Rep

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show abstract

“…The product of the dehydrogenation on the oxidised catalyst was also benzene with traces of hydrogenolysis products. Equation (14) was used to analyse the deactivation data of cyclohexane and cyclohexene dehydrogenation. Figure 5 shows that plot of In In(I/(1 -x;}) against (i -1) for the dehydrogenation of cyclohexane in helium at the three temperatures investigated.…”

Section: Resultsmentioning

confidence: 99%

“…For catalyst deactivation with first order kinetics, the quantity In In (1/(1-Xi» is plotted against (i -1) as indicated in Eq. (14). The slope of the plot gives kdT from which k d may be extracted if T is known.…”

Section: Regeneration Of Catalyst By Reactant Pulsementioning

confidence: 99%

Analysis of Pulse Microcatalytic Technique for Catalyst With Variable Activity I Power Law Deactivation and Regeneration

Ayo

Susu

1988

Chemical Engineering Communications

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A model is proposed for evaluating rate parameters for catalyst deactivation and regeneration based on the pulse kinetic scheme. For catalyst decay, the variable catalyst activity as a function of pulse number is related to the deactivation rate constant. Catalyst regeneration analysis is presented for a regenerative pulse where the important parameter for catalyst regeneration is the residence time of the pulse. The proposed deactivation model is tested on the deactivation of Pt-Re/AI 2 0 3 catalyst by cyclohexane and cyclohexene dehydrogenation to benzene. Agreement with the model was reasonably good.

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“…At the same time, analysis of the literature shows that the difficulty of achieving the equilibrium due to the reversible nature of the dehydrogenation reaction of polycyclic naphthenes causes great differences in the description of kinetic mechanisms, as well as the determination of the order of these reactions. Among the studied substrates, the kinetics of dehydrogenation is understood only for cyclohexane, in the description of which the 1st reaction order is established [ 11 , 12 , 13 , 14 , 15 ]. There is no reliable information in the literature for more complex naphthenic substrates.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Modeling of Hydrogen Production by Dehydrogenation of Polycyclic Naphthenes with Varying Degrees of Condensation

Каленчук

Кustov

2022

Molecules

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The kinetics of reactions of dehydrogenation of polycyclic naphthenes (cyclohexane, decalin, bicyclohexyl, ortho-, meta-, and para-isomers of perhydroterphenyl) is modeled on the basis of a formal comparison of kinetic equations of the 1st and 2nd orders based on real experimental data. It is shown that the reaction of the 1st order is predominating in the series of cyclohexane–bicyclohexyl–perhydroparatherphenyl. For all other substrates, the probability of describing the reaction in accordance with the equation of the 2nd order increases markedly, and for trans-decalin it becomes the predominant form of describing the kinetics of the reaction.

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The structure sensitivity of cyclohexane dehydrogenation and hydrogenolysis catalyzed by platinum single crystals at atmospheric pressure

Cited by 119 publications

References 26 publications

Platinum Nanoparticle-embedded Porous Diamond Spherical Particles as an Active and Stable Heterogeneous Catalyst

Platinum Nanoparticle-embedded Porous Diamond Spherical Particles as an Active and Stable Heterogeneous Catalyst

Analysis of Pulse Microcatalytic Technique for Catalyst With Variable Activity I Power Law Deactivation and Regeneration

Kinetic Modeling of Hydrogen Production by Dehydrogenation of Polycyclic Naphthenes with Varying Degrees of Condensation

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