A study of Ru–Mo/Al2O3 catalysts

Scott, Carlos E.; Betancourt, Paulino; Zurita-Gotor, Mauricio; Bolívar, C.; Goldwasser, J.

doi:10.1016/s0926-860x(99)00529-3

Cited by 23 publications

(15 citation statements)

References 41 publications

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“…This was previously observed for mixed Ru/Mo precursors 49. 50 One reason for the lowering of the reduction temperature is that Ru metal dissociates H 2 , which then spills over to Mo sites and makes reduction easier 51…”

Section: Resultssupporting

confidence: 56%

Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

et al. 2007

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We use polyoxometalates as precursors for the preparation of heterogeneous catalysts. In the starting molecular precursor [{Ru(C6Me6)}(2)Mo5O18{Ru(C6Me6)(H2O)}], three ruthenium arene fragments are supported on a formally lacunary Lindqvist-type polyoxomolybdate. This species was introduced by incipient wetness impregnation into the porosity of a SBA-15-type mesoporous silica. The evolution of the system under reducing atmosphere is followed by several methods, such as temperature-programmed reduction (TPR), Raman, and X-ray absorption spectroscopy (XAS). The results indicate that the polyoxometalate structure is retained after grafting on silica and allows the stabilization of Ru(0) nanoparticles after reduction. The resulting system exhibits interesting catalytic activity in benzene hydrogenation.

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Section: Resultssupporting

confidence: 56%

Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

et al. 2007

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“…40 When Ru and MoO x species was close on the support, the H 2 spillover facilitated the reduction of MoO x . 39,[41][42][43] This behavior increased a possible electronic transfer between Ru and MoO x .…”

Section: Catalyst Characterizationmentioning

confidence: 91%

“…These results suggested that Ru facilitated to the reduction of Mo species, 39 in which H 2 was adsorbed on Ru and dissociated to highly reactive hydrogen atoms. 40 When Ru and MoO x species was close on the support, the H 2 spillover facilitated the reduction of MoO x .…”

Section: Catalyst Characterizationmentioning

confidence: 93%

“…In addition, over the reduced 5% Ru/C catalyst, the binding energy of metal Ru shied to higher binding energy compared to the reduced 5% Ru-10% MoO x /C catalyst, which indicated that there have some electrons was transferred from MoO x to Ru. 39 On the other hand, the chemical status of Mo 3d was measured and the results were shown in Fig. 2b.…”

mentioning

confidence: 99%

“…A higher electronic density over Ru increased the hydrogenolysis of the minimum electron density C-OH bond since Ru electron-donating properties. 39 On the other hand, the mutual electronic impact maybe was attributed to the synergistic activity. Considering the highest DMF yield a Reaction condition: 180 C, 1.5 MPa of H 2 , 1 h, HMF 0.5 g, n-butyl alcohol 40 ml and 0.1 g catalyst; the Ru and Mo loading were dened by the mass fraction on support.…”

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confidence: 99%

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Selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran on Ru–MoO_x/C catalysts

Yang

Liu

et al. 2017

RSC Adv.

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Selective hydrogenation of 5-hydroxymethylfurfural (HMF) has potential application in high quality biofuels.Herein, the catalytic hydrodeoxygenation (HDO) of HMF to 2,5-dimethylfuran (DMF) was investigated using bi-functional Ru-MoO x /C catalyst prepared by initial wetness impregnation. The high dispersion and electronic transfer between Ru and MoO x were demonstrated by a series of characterization techniques.During this HDO process, the synergy effect between metallic Ru and acidic MoO x species in the RuMoO x /C catalyst plays an essential role in obtaining maximized target product DMF (79.4%) via effective aldehyde group hydrogenation by Ru followed by dehydration over MoO x . This work also elucidated that DMF production proceeded through two distinct pathways: the 2,5-hydroxymethyl furan intermediate was preferable by the aldehyde group hydrogenation of HMF over the Ru-MoO x /C catalyst. Over MoO x / C catalyst, comparatively, 5-methyl furfural was the key intermediate by direct hydrogenolysis of the hydroxyl group in HMF. This kind of catalyst is stable for the first two runs by maintaining the target product yield. After the third run, the catalyst showed deactivation gradually but could be almost completely recovered after regeneration by H 2 reduction.

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Catalytic Hydrogenation/Hydrogenolysis of 5‐Hydroxymethylfurfural to 2,5‐Dimethylfuran

2020

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Recent developments in transformations of biobased 5hydroxymethylfurfural to 2,5-dimethylfuran, a potential liquid fuel, are critically summarized. The highest yield of 2,5-dimethylfuran (more than 98 %) from 5-hydroxymethylfurfural are obtained over bimetallic CuÀ Co supported on carbon at 180°C under 5 bar hydrogen in 2-propanol and over Ni supported on mesoporous carbon at 200°C under 30 bar hydrogen in water in a batch reactor. The desired catalyst should have relatively high metal dispersion and some acidity to facilitate both hydrogenation and hydrogenolysis. However, overhydrogenation and overhydrogenolysis forming 2,5-dimeth-yltetrahydrofuran and methylfuran, respectively, should be suppressed. Furthermore, a hydrophobic support is more selective than oxide-based support. After a careful adjustment of the residence time in a continuous reactor it is also possible to produce high yields of 2,5-dimethylfuran even over Pt/C. The main challenges limiting the industrial feasibility of these reactions are relatively low initial reactant concentration, catalyst deactivation by sintering, leaching and coking. In addition to selection of optimum reaction conditions and catalyst properties, kinetic modelling was also summarized.

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A study of Ru–Mo/Al2O3 catalysts

Cited by 23 publications

References 41 publications

Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran on Ru–MoO_x/C catalysts

Catalytic Hydrogenation/Hydrogenolysis of 5‐Hydroxymethylfurfural to 2,5‐Dimethylfuran

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A study of Ru–Mo/Al2O3 catalysts

Cited by 23 publications

References 41 publications

Polyoxomolybdate‐Stabilized Ru0 Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Polyoxomolybdate‐Stabilized Ru0 Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran on Ru–MoOx/C catalysts

Catalytic Hydrogenation/Hydrogenolysis of 5‐Hydroxymethylfurfural to 2,5‐Dimethylfuran

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Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Polyoxomolybdate‐Stabilized Ru⁰ Nanoparticles Deposited on Mesoporous Silica as Catalysts for Aromatic Hydrogenation

Selective hydrodeoxygenation of 5-hydroxymethylfurfural to 2,5-dimethylfuran on Ru–MoO_x/C catalysts