The structure of rhenium oxide–alumina metathesis catalysts

Coverdale, A. K.; Dearing, P.F.; Ellison, A.

doi:10.1039/c39830000567

Cited by 18 publications

(4 citation statements)

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“…, reactions as depicted in Eq. Methyltrioxorhenium, CH 3 ReO 3 , prepared from Re 2 O 7 and (CH 3 ) 4 Sn, anchored to an SiO 2 -Al 2 O 3 support is a moderately active catalyst without any additive [114]. Both 119 Sn NMR and Mössbauer data accounted for the presence of species A.…”

Section: Modified Re 2 O 7 /Al 2 O 3 Catalystsmentioning

confidence: 98%

Metathesis of Alkenes

Mol

Leeuwen

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction Scope of the Reaction Acyclic Alkenes Alkadienes Cyclic Alkenes Ring‐Opening Metathesis Metathesis Catalysts Solid Metathesis Catalysts Mechanism Molybdenum Catalysts Mo O 3 / Al 2 O 3 Effect of Impurities Mo O 3 / Si O 2 Tungsten Catalysts WO 3 / Al 2 O 3 WO 3 / Si O 2 Rhenium Re 2 O 7 / Al 2 O 3 A Catalyst Characterization B Particle Size C Catalytic Activity D Selectivity Modified Re 2 O 7 / Al 2 O 3 Catalysts A Role of the Promoter B Catalyst Deactivation Kinetics Industrial Applications The P hillips T riolefin Process The Meta‐4 Process Production of 1‐Hexene Production of Neohexene SHOP Production of Fine Chemicals Conclusions

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Section: Modified Re 2 O 7 /Al 2 O 3 Catalystsmentioning

confidence: 98%

Metathesis of Alkenes

Mol

Leeuwen

2008

Handbook of Heterogeneous Catalysis

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“…It is generally agreed that the monomeric tetrahedral structure of ReO 4 -, is stabilized over the alumina surface: the metal centre forms three equivalent Re=O moieties and a Re-O-Al bond with an acidic OH group on the support. 18,30 Although the nature of this last interaction is not fully understood, a high surface area (S A ) of the solid alumina is crucial to increase the dispersion of the active phase and to improve the catalytic performance. 31 This reason may account for the behaviour reported in Table 2: in the presence of both scCO 2 and n-heptane as a solvent, the Re-A 1 sample supported on a g-Al 2 O 3 of 257 m 2 /g, allows a higher conversion with respect to the Re-A 2 catalyst prepared on a g-Al 2 O 3 of 200 m 2 /g.…”

Section: The Influence Of the Catalystmentioning

confidence: 99%

“…Both products were not isolated: their structures were assigned by GC-MS and by comparison to an authentic commercial sample (5-decene: Aldrich # 110485). (15), 57 (30), 56 ([M -(CH 2 ) 8 ] + , 53), 55 (82), 54 (18). Database Wiley: Rif.…”

Section: Self-metathesis Of 1-hexene and 1-heptenementioning

confidence: 99%

The metathesis of α-olefins over supported Re-catalysts in supercritical CO₂

et al. 2009

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At 35 • C, in the presence of supercritical carbon dioxide (80-150 bar) as a solvent, a-olefins (RCH=CH 2 , R = C4-C6) undergo highly selective self-metathesis catalyzed by supported Re-oxide (7%). To the best of our knowledge, this is the first procedure for the metathesis of alkenes, in which heterogeneous catalysts are combined with the use of dense CO 2 . The intrinsic eco-compatibility and the unique physicochemical properties of this medium offer both environmental and synthetic advantages: not only conventional toxic solvents (e.g. n-heptane and toluene) can be replaced, but the reaction is faster. For instance, after 2 h, the average conversion of 1-octene is 67% and 40% in scCO 2 and n-heptane, respectively. The product of self-methatesis, 7-tetradecene, can be isolated in yields up to 68%. At 90 bar, the reaction is rather sensitive to the mole fraction of the olefin (in scCO 2 ); though, the enhancement of the pressure (and the density) of the supercritical medium does not induce significant effects on either the rate or the selectivity of the process. The nature of the catalytic support also greatly affects the reaction outcome: Re-oxide shows good activity if dispersed over g-Al 2 O 3 , while silica-based systems are ineffective.

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“…Pt–Re‐based catalysts, for example, are used for the catalytic reforming of low‐octane naphtha to high‐octane petrol, because of their excellent resilience to poisoning from sulfur and phosphorous . Rhenium is also used for olefin metathesis, where typically Re 2 O 7 is supported on alumina, partial oxidation and dehydrogenation reactions . Clearly, the diverse uses of rhenium require an exact knowledge of the surface species present, if the chemistry is to be fully understood.…”

Section: Introductionmentioning

confidence: 99%