Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst: Is it closer to a silica- or an alumina-supported system?

Erwan Le Roux; Mostafa Taoufik; Anne Baudouin; Christophe Copéret; Jean Thivolle-Cazat; Jean Marie Basset; Barry M. Maunders; Glenn J. Sunley

doi:10.1002/adsc.200600436

Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst: Is it closer to a silica- or an alumina-supported system?

Erwan Le Roux, Mostafa Taoufik^*, Anne Baudouin, Christophe Copéret, Jean Thivolle-Cazat, Jean Marie Basset, Barry M. Maunders, Glenn J. Sunley

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

Grafting of [W(≡C-t-Bu)(CH₂-t-Bu)₃] (1) on silica-alumina partially dehydroxylated at 500°C generates a surface complex [(≡SiO)W(≡C-t-Bu)-(CH₂-t-Bu)₃] (2) as evidenced by mass balance analysis, IR, and NMR spectroscopy. Upon treatment of this species under H₂, a tungsten hydride derivative, [(≡SiO)(EO)W(H)_x] (3), (E=Si or Al), is formed. Both of these complexes are active as alkane metathesis catalysts. The activity of this hydride is similar to that observed for the tungsten hydride-supported on alumina and much greater than that obtained on silica. Noteworthy are the selectivities in higher alkane homologues, that is C_n+1>C _n+2, which are fully consistent with olefin metathesis being the key homologation process.

Original language	English (US)
Pages (from-to)	231-237
Number of pages	7
Journal	Advanced Synthesis and Catalysis
Volume	349
Issue number	1-2
DOIs	https://doi.org/10.1002/adsc.200600436
State	Published - Jan 2007
Externally published	Yes

Keywords

Alkanes
Hydrides
Metathesis
Silica-alumina
Tungsten

ASJC Scopus subject areas

Catalysis
Organic Chemistry

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10.1002/adsc.200600436

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title = "Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst: Is it closer to a silica- or an alumina-supported system?",

abstract = "Grafting of [W(≡C-t-Bu)(CH2-t-Bu)3] (1) on silica-alumina partially dehydroxylated at 500°C generates a surface complex [(≡SiO)W(≡C-t-Bu)-(CH2-t-Bu)3] (2) as evidenced by mass balance analysis, IR, and NMR spectroscopy. Upon treatment of this species under H2, a tungsten hydride derivative, [(≡SiO)(EO)W(H)x] (3), (E=Si or Al), is formed. Both of these complexes are active as alkane metathesis catalysts. The activity of this hydride is similar to that observed for the tungsten hydride-supported on alumina and much greater than that obtained on silica. Noteworthy are the selectivities in higher alkane homologues, that is Cn+1>C n+2, which are fully consistent with olefin metathesis being the key homologation process.",

keywords = "Alkanes, Hydrides, Metathesis, Silica-alumina, Tungsten",

author = "{Le Roux}, Erwan and Mostafa Taoufik and Anne Baudouin and Christophe Cop{\'e}ret and Jean Thivolle-Cazat and Basset, {Jean Marie} and Maunders, {Barry M.} and Sunley, {Glenn J.}",

year = "2007",

month = jan,

doi = "10.1002/adsc.200600436",

language = "English (US)",

volume = "349",

pages = "231--237",

journal = "Advanced Synthesis and Catalysis",

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TY - JOUR

T1 - Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst

T2 - Is it closer to a silica- or an alumina-supported system?

AU - Le Roux, Erwan

AU - Taoufik, Mostafa

AU - Baudouin, Anne

AU - Copéret, Christophe

AU - Thivolle-Cazat, Jean

AU - Basset, Jean Marie

AU - Maunders, Barry M.

AU - Sunley, Glenn J.

PY - 2007/1

Y1 - 2007/1

N2 - Grafting of [W(≡C-t-Bu)(CH2-t-Bu)3] (1) on silica-alumina partially dehydroxylated at 500°C generates a surface complex [(≡SiO)W(≡C-t-Bu)-(CH2-t-Bu)3] (2) as evidenced by mass balance analysis, IR, and NMR spectroscopy. Upon treatment of this species under H2, a tungsten hydride derivative, [(≡SiO)(EO)W(H)x] (3), (E=Si or Al), is formed. Both of these complexes are active as alkane metathesis catalysts. The activity of this hydride is similar to that observed for the tungsten hydride-supported on alumina and much greater than that obtained on silica. Noteworthy are the selectivities in higher alkane homologues, that is Cn+1>C n+2, which are fully consistent with olefin metathesis being the key homologation process.

AB - Grafting of [W(≡C-t-Bu)(CH2-t-Bu)3] (1) on silica-alumina partially dehydroxylated at 500°C generates a surface complex [(≡SiO)W(≡C-t-Bu)-(CH2-t-Bu)3] (2) as evidenced by mass balance analysis, IR, and NMR spectroscopy. Upon treatment of this species under H2, a tungsten hydride derivative, [(≡SiO)(EO)W(H)x] (3), (E=Si or Al), is formed. Both of these complexes are active as alkane metathesis catalysts. The activity of this hydride is similar to that observed for the tungsten hydride-supported on alumina and much greater than that obtained on silica. Noteworthy are the selectivities in higher alkane homologues, that is Cn+1>C n+2, which are fully consistent with olefin metathesis being the key homologation process.

KW - Alkanes

KW - Hydrides

KW - Metathesis

KW - Silica-alumina

KW - Tungsten

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DO - 10.1002/adsc.200600436

M3 - Article

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SN - 1615-4150

VL - 349

SP - 231

EP - 237

JO - Advanced Synthesis and Catalysis

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IS - 1-2

ER -

Silica-alumina-supported, tungsten-based heterogeneous alkane metathesis catalyst: Is it closer to a silica- or an alumina-supported system?

Abstract

Keywords

ASJC Scopus subject areas

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