Methanation with [Re(CO)3OH]4/Al2O3. Evidence for spillover species

Lane, Philip D.; Shapley, John R.

doi:10.1016/0304-5102(93)e0157-c

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…Insight into what this fundamental difference might be is obtained by examination of the TPDE profile of {Re(CO) 3 (μ 3 -OH)} 4 supported on alumina (Figure ) . As mentioned previously, supporting {Re(CO) 3 (μ 3 -OH)} 4 on alumina is believed to quantitatively produce a mononuclear rhenium tricarbonyl species, nominally written as Re(CO) 3 {O−Al}{HO−Al} 2 .…”

Section: Discussionmentioning

confidence: 85%

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

et al. 1996

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A set of supported bimetallic catalysts, designated [Re7Ir−N], [Re7Ir−P], [Re5IrRe2−N], and [Re5IrRe2−P], has been prepared from two structural isomers (1 and 2) of the cluster compound [Z]2[Re7IrC(CO)23] (Z+ = NEt4 +, N(PPh3)2 +) by deposition onto high surface area alumina (≤1% Re) and activation in H2 at 773 K. The specific activities of the catalysts for ethane hydrogenolysis at 500 K vary significantly (3−63 mmol of CH4/mol of Re7Ir per s) and depend on both the metal framework structure and the counterion present in the precursor. Interpretation of EXAFS data (from both Re and Ir L3-edges) has enabled the development of specific models for the catalyst particle nanostructures that correlate with the catalytic activities. The more active catalysts ([Re7Ir−N] and [Re5IrRe2−N]) are modeled by a hemisphere of close-packed (hcp) metal atoms (average diameter 1 nm) with Ir at the core. On the other hand, the less active catalysts ([Re7Ir−P] and [Re5IrRe2−P]) are better described as two-dimensional layer structures. A combination of techniques, TPDE, IR, XANES, and EXAFS, applied under temperature-programmed conditions, has demonstrated that evolution of the final catalyst particle nanostructure depends on significant initial fragmentation of the cluster framework followed by preferential nucleation at iridium centers.

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Section: Discussionmentioning

confidence: 85%

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

et al. 1996

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“…This set of compounds, in which the ratio of rhenium and platinum varies systematically (3:1, 2:2, 1:3), may prove useful as precursors for the formation of bimetallic metal particles in model heterogeneous catalysts. 27,28 …”

Section: Resultsmentioning

confidence: 99%

“…We have synthesized and characterized the set of heterobimetallic hydroxy cubanes {Re(CO) 3 } 4 - n {PtMe 3 } n (OH) 4 , ( n = 1−3). This set of compounds, in which the ratio of rhenium and platinum varies systematically (3:1, 2:2, 1:3), may prove useful as precursors for the formation of bimetallic metal particles in model heterogeneous catalysts. , …”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of {Re(CO)₃}₄_-_n{PtMe₃}_n(OH)₄, (n = 1−3). A Set of Heterobimetallic Hydroxy Cubane Complexes

1999

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Annual survey of organometallic metal cluster chemistry for the year 1994

Richmond

1996

Coordination Chemistry Reviews

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Methanation with [Re(CO)3OH]4/Al2O3. Evidence for spillover species

Cited by 3 publications

References 17 publications

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

Synthesis and Characterization of {Re(CO)₃}₄_-_n{PtMe₃}_n(OH)₄, (n = 1−3). A Set of Heterobimetallic Hydroxy Cubane Complexes

Annual survey of organometallic metal cluster chemistry for the year 1994

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Methanation with [Re(CO)3OH]4/Al2O3. Evidence for spillover species

Cited by 3 publications

References 17 publications

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

Bimetallic Catalyst Particle Nanostructure. Evolution from Molecular Cluster Precursors

Synthesis and Characterization of {Re(CO)3}4-n{PtMe3}n(OH)4, (n = 1−3). A Set of Heterobimetallic Hydroxy Cubane Complexes

Annual survey of organometallic metal cluster chemistry for the year 1994

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Synthesis and Characterization of {Re(CO)₃}₄_-_n{PtMe₃}_n(OH)₄, (n = 1−3). A Set of Heterobimetallic Hydroxy Cubane Complexes