n-Butene Skeletal Isomerization to Isobutylene on Shape Selective Catalysts: Ferrierite/ZSM-35

Xu, Wenqing; Ye, Yin; Suib, Steven L.; Edwards, John C.; O’Young, Chi-Lin

doi:10.1021/j100023a022

Cited by 107 publications

(58 citation statements)

References 3 publications

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“…However, our previous NH 3 TPD experiments have revealed no significant differences in the distribution of acid strengths between H-TNU-10 and H-ferrierite [14]. According to the IR investigations reported so far, in addition, the acidity associated with framework Al atoms is stronger in ZSM-5 than in ferrierite or its high-silica analog, i.e., ZSM-35 [26][27][28], suggesting that the formation of well-dispersed PdO particles within TNU-10 and ferrierite cannot be correlated solely to the zeolite acidity. Further study is necessary to better elucidate the role of zeolite pore structure in the stabilization of intracrystalline PdO particles.…”

Section: Characterizationmentioning

confidence: 80%

Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

et al. 2008

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Methane combustion was conducted over Pd catalysts supported on medium (ZSM-5, ferrierite, TNU-9, TNU-10) and large (USY, mordenite, beta) pore zeolites. Among the catalysts studied here, Pd/H-TNU-10 exhibited the highest combustion activity, together with excellent durability in the presence of water vapor. A combination of TEM and Pd K-edge XAFS measurements reveals the formation of highly dispersed PdO particles within the TNU-10 pores. This is also the case of Pd/H-ferrierite, while frequently there are large particles (60-100 Å ) on its outer surface. In contrast, most of PdO on zeolites other than these two medium pore materials were found to exist as aggregated particles ([50 Å ) on their outer crystallite surface. It appears that zeolite structures with intersecting 10-and 8-ring pores may be better supports for stabilizing nanometric PdO particles than those with the uniform 10-ring size or with the 12-ring pore system.

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Section: Characterizationmentioning

confidence: 80%

Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

et al. 2008

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“…isomerization of 1-butene to iso-butene [5][6][7][8] and the trans-cis isomerization of 2-butene [9][10][11][12]. Some earlier studies [13] focused on the thermodynamic date and reaction mechanism of 1-butene isomerization reaction.…”

Section: Introductionmentioning

confidence: 99%

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Yang

et al. 2016

Chemical Engineering Journal

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“…Selectivity to isobutene (a), propene plus pentenes (b) during n-butene transformation over FER, EU-1, TON, MFI and alumina. monomolecular mechanism [13,23,26,27], this increase in the yield in isobutene, i.e., the conversion of n-butene into isobutene, would be due to the suppression of the secondary transformations of isobutene. However, this seems most unlikely as the formation of propene plus pentenes is slower from isobutene than from n-butenes.…”

Section: Origin Of the Increase With Time On-stream Of The Selectivitmentioning

confidence: 99%

Selective Skeletal Butene Isomerization Through a Bimolecular Mechanism

Benazzi

Travers

Gnep

et al. 1999

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Isomérisation bimoléculaire sélective du n-butene en isobutene -La transformation du n-butène a été étudiée en réacteur dynamique à 350°C sur des zéolithes à taille de pore intermédiaire (H-FER, H-TON, H-EU-1 et H-MFI) et à 500°C sur alumine. Sur les catalyseurs frais, l'isobutène mais aussi le propène et les pentènes sont directement formés (produits primaires), ce qui démontre que l'isomérisation de squelette du n-butène se produit au moins en partie par des étapes successives d'oligomérisation, isomérisation et craquage (mécanisme bimoléculaire). Les différences importantes de sélectivité entre les catalyseurs sont dues à de nombreux facteurs : participation ou non d'intermédiaires trimères, limitations dans la désorption des produits branchés, etc. Sur tous les catalyseurs, la sélectivité en isobutène augmente avec le temps de travail. Cette augmentation s'explique par un nouveau mode d'isomérisation très sélectif impliquant comme intermédiaires des triméthylpentènes formés par réaction du n-butène sur des molécules d'isobutène retenues dans les pores de la ferrierite. Cette réaction autocatalytique rend très sélective en isobutène la transformation bimoléculaire du n-butène.Mots-clés : butènes, isomérisation de squelette, mécanisme, zéolithe, alumine, sites actifs. Abstract -Selective Skeletal Butene Isomerization through a Bimolecular Mechanism -n-Butene transformation was carried out at 350°C over medium pore size zeolites (H-FER, H-TON, H-EU-1 and H-MFI) and at 500°C over alumina. With fresh catalysts, not only isobutene but also propene and pentenes are primary products, which indicates that at least some of the butene isomerization occurs through oligomerizationisomerization-cracking steps (bimolecular mechanism). The large differences in selectivity are due to many factors, including whether or not trimer intermediates participate in the mechanism and limited product desorption. All the catalysts exhibit increasing isobutene selectivity with increasing time on-stream. This increase in selectivity can be explained by the selective isomerization of n-butene through a reaction process whose first step is the formation of trimethylpentene intermediates from isobutene product and n-butene reactant. This autocatalytic reaction can render the bimolecular transformation of n-butenes very selective to isobutene.

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n-Butene Skeletal Isomerization to Isobutylene on Shape Selective Catalysts: Ferrierite/ZSM-35

Cited by 107 publications

References 3 publications

Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

Methane Combustion over Pd Catalysts Loaded on Medium and Large Pore Zeolites

Room-temperature isomerization of 1-butene to 2-butene over palladium-loaded silica nanospheres catalyst

Selective Skeletal Butene Isomerization Through a Bimolecular Mechanism

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