Hydroisomerisation of n-alkanes over partially reduced MoO3: Promotion by CoAlPO-11 and relations to reaction mechanism and rate-determining step

Meunier, Frédéric; Cavallaro, F.; Goaziou, T. Le; Goguet, Alexandre; Rioche, C.

doi:10.1016/j.cattod.2005.11.029

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…The reduction procedure and the presence of the H 2 atmosphere are key factors for the formation of this active molybdenum phase, along with oxygen vacancies, 44 resulting in the production of metallic/acidic bi-functional catalysts. [45][46][47]…”

Section: Catalytic Resultsmentioning

confidence: 99%

One-step propylene formation from bio-glycerol over molybdena-based catalysts

2015

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This work presents a novel, one-step catalytic process, enabling highly selective propylene formation via glycerol hydro-deoxygenation (HDO) reactions. Fe-Mo catalysts, supported on black and activated carbons, are selective towards C-O bond cleavage, thus converting glycerol to propylene with high yields. BET, XRD, TPD-NH 3 and TPD-He methods have been employed for the characterization of the samples. Molybdenum oxide, at its reduced state, is essential for driving selectively the reaction towards complete deoxygenation. The only product of glycerol HDO is propene, in the gas phase, while 2-propenol, propanols and propylene glycol have been detected, among others, in the liquid phase. Under the standard reaction conditions (300°C temperature, 8.0 MPa hydrogen pressure), glycerol conversion exceeds 88% and selectivity to propene reaches 76% after 6 hours of reaction. This study includes the investigation of the operating conditions effect (i.e. reaction time, reaction temperature, catalyst loading and H 2 pressure) regarding glycerol HDO towards propene formation.

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Section: Catalytic Resultsmentioning

confidence: 99%

One-step propylene formation from bio-glycerol over molybdena-based catalysts

2015

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“…One-dimensional metal oxide nanostructures have been actively studied due to their unique properties. Among these nanostructured metal oxides, molybdenum oxide (MoO 3 ) is a very attractive material and has been used extensively in chemical industry. , Molybdenum oxide thin films and its nanostructures offer a wide spectrum of potential applications, including field emission devices, − batteries, − electrochromic devices, − gas sensors, − and catalysts. ,− Moreover, large-scale synthesis of molybdenum oxide nanostructures is readily achievable using various techniques ranging from direct thermal heating of Mo in a furnace, infrared radiation heating of the Mo foil, and hydrothermal , and sol−gel methods …”

Section: Introductionmentioning

confidence: 99%

“…1,2 Molybdenum oxide thin films and its nanostructures offer a wide spectrum of potential applications, including field emission devices, [3][4][5] batteries, [6][7][8][9] electrochromic devices, [9][10][11][12] gas sensors, [13][14][15][16] and catalysts. 1,[17][18][19] Moreover, large-scale synthesis of molybdenum oxide nanostructures is readily achievable using various techniques ranging from direct thermal heating 3 of Mo in a furnace, infrared radiation heating of the Mo foil, 4 and hydrothermal 20,21 and sol-gel methods. 10 Thermal evaporation of Mo onto substrates is an easy way to synthesize MoO 3 nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Rainbow-like MoO₃ Nanobelts Fashioned via AFM Micromachining

et al. 2009

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Single-crystalline MoO3 nanobelts were prepared on a wide variety of substrates by a simple evaporation and deposition process using a thermal hot plate. This cost-effective technique has the potential for large-scale production of MoO3 nanobelts with a unique layered structure. The MoO3 nanobelts dispersed on silicon substrates exhibited a wide variety of colors attributable to the difference in the thicknesses of the nanobelts. Due to the weak interlayer binding, partial and localized removal of the layered nanobelts was readily achieved via atomic force microscope micromachining, resulting in multicolored patterns on individual nanobelts.

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“…These fi ndings indicate that the isomerization activity of partially reduced MoO3 can be controlled by the activity as an acid catalyst. Menuier suggested from some experimental facts that butane isomerization on partially reduced MoO3 occured through a bifunctional mechanism, and the rate-determining step may be the isomerization of n-butene intermediate to isobutene 21), 22) . Partially reduced MoO3 with high catalytic activities for heptane isomerization and 2-propanol dehydration has a surface area of about 180 m 2 /g and average Mo valence of 3.5 to 2.5.…”

Section: Introductionmentioning

confidence: 99%

Reduction of MoO<sub>3</sub> to Porous Molybdenum Oxides and Its Catalytic Properties for Alkane Isomerization

Matsuda

Ohno

Sakagami

et al. 2007

J. Jpn. Petrol. Inst.

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The catalytic activity of partially reduced Pt/MoO3 for alkane isomerization was investigated. The surface area of Pt/MoO3 was markedly enlarged by H2 reduction to a maximum after reduction at 673 K for 12 h. Enlargement of the surface area was caused by formation of pores with diameters of 0.6-3 nm. The catalytic activity of partially reduced Pt/MoO3 for heptane isomerization increased with reduction temperature, and reached a maximum at 723 K. The catalytic activity for 2-propanol dehydration was very similar to that of heptane isomerization. The isomerization and dehydration activities of partially reduced Pt/Na _ MoO3 rapidly decreased with increasing content of Na. In contrast, the hydrogenation of cyclohexene was promoted on catalysts containing Na. The isomerization and dehydration activities were related to the number of acid sites, determined by NH3-TPD. Therefore, the isomerization activity of partially reduced Pt/MoO3 depends on the activity as an acid catalyst. H2 reduction at 673 K enlarged the surface areas of H1.55MoO3 and Pt/MoO3, but not the surface area of MoO3. H1.55MoO3 and Pt/MoO3 reduced at 673 K had comparable activity for pentane isomerization, and were much more active than MoO3 reduced at 673 K, even after considering the differences in surface areas. Molybdenum oxyhydride, MoOxHy, was formed after the decomposition of hydrogen molybdenum bronze in the reduction of H1.55MoO3 and Pt/MoO3. On the other hand, MoO3 was reduced to MoO2 without the formation of hydrogen bronze. These results show that surface area and isomerization activity were improved by the formation of MoOxHy from HxMoO3.

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Hydroisomerisation of n-alkanes over partially reduced MoO3: Promotion by CoAlPO-11 and relations to reaction mechanism and rate-determining step

Cited by 13 publications

References 19 publications

One-step propylene formation from bio-glycerol over molybdena-based catalysts

One-step propylene formation from bio-glycerol over molybdena-based catalysts

Rainbow-like MoO₃ Nanobelts Fashioned via AFM Micromachining

Reduction of MoO<sub>3</sub> to Porous Molybdenum Oxides and Its Catalytic Properties for Alkane Isomerization

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Hydroisomerisation of n-alkanes over partially reduced MoO3: Promotion by CoAlPO-11 and relations to reaction mechanism and rate-determining step

Cited by 13 publications

References 19 publications

One-step propylene formation from bio-glycerol over molybdena-based catalysts

One-step propylene formation from bio-glycerol over molybdena-based catalysts

Rainbow-like MoO3 Nanobelts Fashioned via AFM Micromachining

Reduction of MoO<sub>3</sub> to Porous Molybdenum Oxides and Its Catalytic Properties for Alkane Isomerization

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Product

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Rainbow-like MoO₃ Nanobelts Fashioned via AFM Micromachining