Effect of support acid–basic properties on activity and selectivity of Pt catalysts in reaction of methylcyclopentane ring opening

Galperin, L.B.; Bricker, Jeffery C.; Holmgren, Jeniffer

doi:10.1016/s0926-860x(02)00416-7

Cited by 54 publications

(42 citation statements)

References 23 publications

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“…Galperin et al [17] inhibited the activity of the acid sites of a bifunctional platinum catalyst by addition of potassium. They showed that the catalyst acted then like a monofunctional metallic catalyst, which enabled a high selectivity for ring opening products.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

et al. 2012

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The hydrogenation and ring opening of model hydrocarbons and of naphtha was studied over commercial noble metal (Ir, Pt, Rh)/Al 2 O 3 catalysts. The experiments were performed in a fixed bed reactor at temperatures between 220 and 350°C and pressures of 1.1 and 5.0 MPa, respectively. The product distribution was determined and the cetane number was calculated. The Pt catalyst is very active for hydrogenation of aromatics but does not catalyse the ring opening of naphthenes. The Ir and Rh catalysts are active for both hydrogenation of aromatics and ring opening of naphthenes. Experiments with toluene, mxylene, propyl-benzene, and methylcyclohexane indicate that ring opening follows a selective mechanism, where the cleavage of bisecondary carbon bonds is favoured. This results in predominant formation of branched paraffins. The product distribution as well as cracking of long-chain hydrocarbons, which increase at temperatures above 260°C, lead to an insignificant boost in the cetane number, as confirmed by experiments using real naphtha as feedstock.

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Section: Introductionmentioning

confidence: 99%

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

et al. 2012

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“…Zeolite-supported transition metals have been found to be active catalysts for many processes [1][2][3][4]. Since the pioneering work of Li and Armor [5] on the catalytic activity of Co-ZSM-5, metal exchanged ZSM-5 have appeared to be promising catalysts for the catalytic reduction of NO x by methane in the presence of excess O 2 .…”

Section: Introductionmentioning

confidence: 99%

“…Since the pioneering work of Li and Armor [5] on the catalytic activity of Co-ZSM-5, metal exchanged ZSM-5 have appeared to be promising catalysts for the catalytic reduction of NO x by methane in the presence of excess O 2 . Recently, zeolitesupported Pd catalysts; especially, Pd-ZSM-5 and Pd-H-ZSM-5 have drawn a lot of worldwide attention [6][7][8][9][10][11] due to their excellent catalytic activity in methane combustion [12][13][14], NO reduction by CH 4 [15] and many organic reactions [16]. The findings of Nishizaka and Misono [17] suggest that Brønsted acid sites may play an important role in stabilizing Pd in a highly dispersed state, and this form of Pd is required to achieve high activity and selectivity for NO reduction by CH 4 in the presence of O 2 .…”

Section: Introductionmentioning

confidence: 99%

Nature of CO and NO Interactions with Pd-H-ZSM-5 Catalyst: A Comparative Study of DFT-Based Cluster and ONIOM Methods

Kalita

Deka

2010

Catal Lett

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The binding of CO and NO to Pd atom supported on H-ZSM-5 zeolite have been studied with density functional theory using both simple cluster and embedded cluster models. The adsorption energies of CO and NO are found to be 2-3 kcal/mol stronger in embedded cluster approach than those that are in cluster model. We discuss trends in bond lengths, adsorption energies and vibrational frequencies of the adsorbed species with relation to the magnitude of charges using NPA scheme of NBO method.

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“…Fine metal particles supported on different oxides such as silica, alumina and zeolites are highly active in dehydrogenation, isomerization and hydrocracking of alkanes [1][2][3][4][5][6][7][8][9]. It is generally accepted that in a dual-function catalyst, hydrogenation and dehydrogenation occur on a metal particle, whereas isomerization proceeds on an acid site [10,11].…”

Section: Introductionmentioning

confidence: 99%

The State and Reactivity of Pt6 Particles in ZSM-5 Zeolite

2007

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The density functional theory (DFT/B3LYP) calculations were applied to investigate the interaction of a Pt 6 particle with the ZSM-5 zeolite framework. The electronic structure of the metal particle is strongly affected by the interaction with basic framework oxygens and acid sites of the zeolite support. Adsorption on basic sites (E ads = 6 kcal/mol) favors the formation of the electron enriched metal cluster. Interaction of the platinum cluster with the acid site characterized by stabilization energy of 47 kcal/mol results in oxidation of the metal particle and suppression of Brønsted acidity of the support. The hypothesis is put forward that the oxidized platinum particle can function as an active site for the alkane isomerisation on platinum supported high silica zeolites.

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Effect of support acid–basic properties on activity and selectivity of Pt catalysts in reaction of methylcyclopentane ring opening

Cited by 54 publications

References 23 publications

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

Hydrogenation and Ring Opening of Aromatic and Naphthenic Hydrocarbons Over Noble Metal (Ir, Pt, Rh)/Al2O3 Catalysts

Nature of CO and NO Interactions with Pd-H-ZSM-5 Catalyst: A Comparative Study of DFT-Based Cluster and ONIOM Methods

The State and Reactivity of Pt6 Particles in ZSM-5 Zeolite

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