Influence of the precursor and the support on the catalytic properties of ruthenium for alkane hydrogenolysis

Coq, Bernard; Bittar, A.; Dutartre, R.; Figuéras, F.

doi:10.1016/s0166-9834(00)82170-3

Cited by 32 publications

(19 citation statements)

References 25 publications

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“…The effect of tin on Ru particles size is quite controversial: Coq and co-workers observed an increase in the size of Ru ensembles (while the metal particle size does not change) in Ru-Sn/Al 2 O 3 catalysts at low Sn/Ru ratios, whereas the size of the Ru ensembles is decreased at higher Sn content (Sn/Ru > 0.63). [21,22] The method employed for tin deposition on preformed Ru NPs is expected to be selective for the deposition on the metal surface rather than on support and, moreover, the formation of several alloys could occur. [23] These two phenomena could lead to particle enlargement, but also a sintering of extremely dispersed Ru species and/or smaller Ru NPs can be operative.…”

Section: Tem Characterizationmentioning

confidence: 99%

Hydrogen Production by Glycerol Steam Reforming with Ru‐based Catalysts: A Study on Sn Doping

Gallo

Pirovano

Marelli

et al. 2010

Chemical Vapor Deposition

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Bimetallic Ru-Sn heterogeneous catalysts for glycerol steam reforming (SR) to hydrogen-rich mixtures are developed using organometallic (OM)CVD of commercial metal precursors as the preparation technique of choice. This methodology produces monometallic Ru nanoparticles (NPs) supported on Mg(Al)O mixed oxide with high activity and selectivity for glycerol SR. The effect of tin doping is studied on a set of catalysts with various Sn loadings. Materials produced are characterized by high resolution transmission electron microscopy (HRTEM) and by diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)-quadrupole mass spectrometry (QMS) of adsorbed CO and tested in glycerol SR. At low load, tin is almost selectively deposited on Ru NP faces, and resulting Ru-exposed sites show a higher specific activity than Ru exposed sites in monometallic catalysts.

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Section: Tem Characterizationmentioning

confidence: 99%

Hydrogen Production by Glycerol Steam Reforming with Ru‐based Catalysts: A Study on Sn Doping

Gallo

Pirovano

Marelli

et al. 2010

Chemical Vapor Deposition

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“…However, the pure metals are not only expensive but also prone to be poisoned by reactive intermediates such as carbon monoxide and become inactive. Recently, many studies have shown that addition of some other elements such as Sn, Pb, Ge and Si, into the noble metals may improve on the catalytic properties [1][2][3] and reduce cost. In order to better understand the role of Ge and Si in Ru-Ge-Si catalysts, study on the Ru-Ge-Si phase diagram is necessary.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic description of Ru–Ge–Si ternary system

Long¹,

Liu²,

Jin³

2009

Journal of Alloys and Compounds

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“…Rhodium catalysts are much less sensitive to the metallic dispersion in the conversion of MCP [7,17,18,19]. The reaction conditions may have exerted more significant effect on the product distribution than particle size [7,14,20]: as the temperature increased and the hydrogen excess decreased, multiple hydrogenolysis -yielding <C 6 fragments -became more and more important.…”

Section: Introductionmentioning

confidence: 99%

Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction

Teschner

Piraúlt-Roy

Naud

et al. 2003

Applied Catalysis A: General

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The reaction mechanism of methylcyclopentane (MCP) ring opening on Rh catalysts (the participation of each intermediate in further hydrogenolysis vs. their desorption) was studied on a special series of Rh(Ge)/Al 2 O 3 catalysts. These were obtained by wet impregnation and adding different amounts of Ge by anchoring of Ge(n-C 4 H 9 ) 4 on the surface of Rh with preadsorbed hydrogen. As shown earlier [1], low amounts of Ge were deposited selectively on low-Miller-index microfacets, whereas excess use of Ge(n-C 4 H 9 ) 4 caused statistical deposition on Rh. This difference was also reflected in the ring-opening pattern: the sample with randomly located Ge behaved like the parent catalyst with dispersion of 80%. Each ring-opening intermediate hydrogenolyzed further nearly to the same extent; the ring opening product distribution (ROPD) showing thus no variation as a function of reaction conditions. The catalyst with selective Ge deposition followed, however, the pattern of a sintered sample: the surface intermediate of 2-methylpentane underwent preferential hydrogenolysis to smaller fragments. Thus, changing the position of Ge deposits (without modifying the particle size) induced changes in the prevailing reaction route.

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Influence of the precursor and the support on the catalytic properties of ruthenium for alkane hydrogenolysis

Cited by 32 publications

References 25 publications

Hydrogen Production by Glycerol Steam Reforming with Ru‐based Catalysts: A Study on Sn Doping

Hydrogen Production by Glycerol Steam Reforming with Ru‐based Catalysts: A Study on Sn Doping

Thermodynamic description of Ru–Ge–Si ternary system

Methylcyclopentane reactions on Rh-Ge/Al2O3 catalysts prepared by controlled surface reaction

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