Catalytic properties of H2-reduced MoO3 and Pt/zeolites for the isomerization of pentane, hexane, and heptane

Matsuda, Takeshi; Watanabe, Kazuhiro; Sakagami, Hirotoshi; Takahashi, Naohiko

doi:10.1016/s0926-860x(02)00531-8

Cited by 42 publications

(35 citation statements)

References 17 publications

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“…n-Heptane was the selected starting feedstock for all processes as widely used in literature [26][27][28] and more reactive raw material as compared to n-hexane or n-pentane [29]. This compound is also present in the gasoline fraction.…”

Section: Catalytic Testsmentioning

confidence: 99%

Continuous-Flow Hydroisomerization of C5–C7 Alkanes Using Mechanochemically Synthesized Supported Pt and Pd-SBA-15 Materials

Hidalgo

Pineda²,

Arancon³

et al. 2015

J Flow Chem

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SBA-15 materials exhibit important properties including large surface area, highly ordered mesopores, and high stability in a variety of catalytic reactions. In this study, Al and Zr-loaded SBA-15 materials (Si/Zr = 30, Si/Al = 30), 50 molar ratio with Pd (1, 2, and 4% (w/w)) and Pt (0.5 and 1% (w/w)) were tested in the isomerization of C5-C7 linear alkanes. These solids were characterized using thermal gravimetric analysis-differential thermal analysis (TGA-DTA), nitrogen physisorption, and energy dispersive X-ray (EDX). Interestingly, the low porosity SBA-15 materials loaded with 2% (w/w) Pd were most active catalysts for n-heptane isomerization. The mechanochemical addition of tungsten also resulted in the increase of catalytic activity for the reaction. The results herein demonstrate the possibilities of SBA-15 catalysts as a commercial catalyst alternative in the catalytic isomerization of hydrocarbons.

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Section: Catalytic Testsmentioning

confidence: 99%

Continuous-Flow Hydroisomerization of C5–C7 Alkanes Using Mechanochemically Synthesized Supported Pt and Pd-SBA-15 Materials

Hidalgo

Pineda²,

Arancon³

et al. 2015

J Flow Chem

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“…5 This discrepancy could be related to the difference of reactivity of the corresponding alkenes, i.e. the isomerisation of butene is less favourable, possibly because of the higher energy requirements associated with C 4 carbonium intermediates.…”

Section: T H I S J O U R N a L I S © T H E R O Y A L S O C I E T Y O mentioning

confidence: 99%

“…[1][2][3][4][5] These materials can be more selective than zeolite-supported platinum (in particular at high conversions), are more resistant to sulfur and nitrogen poisoning and do not catalyse the formation of significant levels of aromatics. [3][4][5] However, industrial applications based on reduced MoO 3 are not yet viable, partly due to the low intrinsic activity of these materials. 5 Further catalyst development has been hampered by the structural complexity of the material and by contradictory statements regarding the associated mechanism of reaction.…”

mentioning

confidence: 99%

“…[3][4][5] However, industrial applications based on reduced MoO 3 are not yet viable, partly due to the low intrinsic activity of these materials. 5 Further catalyst development has been hampered by the structural complexity of the material and by contradictory statements regarding the associated mechanism of reaction. Katrib et al 6 and Matsuda et al 5 have proposed that a traditional bifunctional mechanism operates, whereas Bouchy et al 7 have proposed a metallacyclobutane intermediate-based mechanism.…”

mentioning

confidence: 99%

“…Katrib et al 6 and Matsuda et al 5 have proposed that a traditional bifunctional mechanism operates, whereas Bouchy et al 7 have proposed a metallacyclobutane intermediate-based mechanism. In the case of the isomerisation of C 5 -C 7 alkanes over reduced MoO 3 , Matsuda et al 5 proposed that the dehydrogenation/hydrogenation process was the rate-determining step. The comparison of basic thermodynamic data with the proportions of reaction products, even at the trace level, has proven a valuable tool in unravelling reaction mechanisms.…”

mentioning

confidence: 99%

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New insights into the reaction mechanism and the rate-determining step of n-butane hydroisomerisation over reduced MoO3 catalystsElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b304978g/

Meunier

2003

Chem. Commun.

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Crystal‐size–dependent external surface diffusion barriers in Pt/ZSM‐5 catalyzed n‐pentane isomerization

Chen

Zhang

et al. 2022

AIChE Journal

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Surface barriers persist in the molecular transport across external crystal surface of zeolites, which brings strong influences on zeolite catalysis. This study probes the role of crystal-size-dependent surface barriers in zeolite catalysis, with n-pentane isomerization catalyzed by Pt/ZSM-5 as a model reaction system. Chemical liquid deposition of SiO 2 is performed to reduce surface barriers on ZSM-5 crystals with different sizes. After SiO 2 deposition, surface barriers on both small (266 nm) and large (1304 nm) crystals are significantly reduced, while the improvement in catalytic activity for the large crystals (76.1%-129.1%) is much higher than that for the small ones (À17.4% to 16.7%). For the large ZSM-5 crystals, diffusion limitation is stronger, and thus the effect of surface barriers on catalytic activity is more important. This study reveals the unique role of crystal-size-dependent surface barriers in zeolite catalysis, and understanding this is important for the optimal design of zeolite catalysts.

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Catalytic properties of H2-reduced MoO3 and Pt/zeolites for the isomerization of pentane, hexane, and heptane

Cited by 42 publications

References 17 publications

Continuous-Flow Hydroisomerization of C5–C7 Alkanes Using Mechanochemically Synthesized Supported Pt and Pd-SBA-15 Materials

Continuous-Flow Hydroisomerization of C5–C7 Alkanes Using Mechanochemically Synthesized Supported Pt and Pd-SBA-15 Materials

New insights into the reaction mechanism and the rate-determining step of n-butane hydroisomerisation over reduced MoO3 catalystsElectronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/cc/b3/b304978g/

Crystal‐size–dependent external surface diffusion barriers in Pt/ZSM‐5 catalyzed n‐pentane isomerization

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