Catalytic reactions of methylcyclohexane (MCH) on partially reduced MoO3

Belatel, H.; Al-Kandari, H.; Al-Khorafi, F.; Katrib, A.; Garin, F.

doi:10.1016/j.apcata.2004.07.029

Cited by 57 publications

(25 citation statements)

References 10 publications

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“…We have reported in previous works [15,16] the catalytic reactions of MCH on the bifunctional MO 2-x (OH) y (M = Mo, W) and Pt-Ir/ZrO 2 -SO4 2-catalysts. Two types of reactions were observed.…”

Section: Methylcyclohexane (Mch) Reactantmentioning

confidence: 99%

Surface Electronic Structure–Catalytic Activity of Different Mo Oxidation States for Olefins and Saturated Hydrocarbon Molecules

2010

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Different catalytic reactions of olefin and saturated hydrocarbon molecules, present in light naphtha require specific catalytic function(s). The relationship of these catalytic reaction(s) and surface electronic structure of different molybdenum oxidation states characterized by XPS-UPS techniques enabled us to identify the nature of the catalytic active phase in each system. Catalytic reactions of 1-pentene, cyclopentene, n-pentane, cyclopentane, 1-heptene, n-heptane and methyl cyclohexane molecules were studied on different MoO 3 , MoO 2-x (OH) y and Mo(0) surfaces as a function of reaction temperatures.

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Section: Methylcyclohexane (Mch) Reactantmentioning

confidence: 99%

Surface Electronic Structure–Catalytic Activity of Different Mo Oxidation States for Olefins and Saturated Hydrocarbon Molecules

2010

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“…It was demonstrated that Mo 4? existed in the form of Mo-OH and acted as a Brønsted acid adsorption site [39,44]. In this case, oxygenates were adsorbed on Brønsted acid site via the donation of a lone electron pair from the oxygen and then the C-O bond was polarized.…”

Section: Hdo Activity Testmentioning

confidence: 99%

Preparation and hydrodeoxygenation properties of Co–Mo–O–B amorphous catalyst

Wang

Yang

Luo

et al. 2010

Reac Kinet Mech Cat

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Co-Mo-O-B amorphous catalysts were prepared by the chemical reduction method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma (ICP) and X-ray photoelectron spectroscopy (XPS). The hydrodeoxygenation (HDO) properties of these catalysts were tested using phenol as the model compound. The catalyst preparation time had no influence on their amorphous structure but a great effect on the catalyst surface composition and the HDO activity. With the prolongation of preparation time, the catalyst particle size and the relative content of Co on the catalyst surface were increased gradually. The conversion of phenol could be as high as 100% with a selectivity of 99.6% for deoxygenation. The aromatics content in the products could be decreased to below 2% and the total H/C atomic ratio could be improved to 1.98. The pseudo first-order reaction rate constant of the phenol transformation on Co-Mo-O-B amorphous catalyst was high to 0.67 mL/(g catalyst s). The main reaction route in the HDO of phenol on Co-Mo-O-B amorphous catalyst proceeded with hydrogenation-dehydration rather than direct hydrogenolysis.

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“…Beside the different oxidation states, which characterize a given Mo oxide (XPS), the presence of a DOS structure at 0.4 eV as well as the s bond at 1.4 eV, measured by UPS, confirm the presence MoO 2 in the upper four to five atomic layers. Moreover, the presence of Brönsted acidic (-OH) groups on the sample surface is observed by XPS in the form of O 1s at 531.6 eV as compared to the oxide O 1s at $530.5 eV [10]. These characterization parameters help to identify the reduction temperatures at which different Mo oxidation states are formed.…”

Section: Introductionmentioning

confidence: 96%

“…In previous publications, a bifunctional MO 2 (H x ) ac phase system (M = Mo, W) has been outlined [9][10][11]. The metallic function in this phase is attributed to delocalized p electrons formed between each two M-M atoms placed along the Caxis of the deformed rutile structure of the MO 2 phase, obtained following the reduction of MO 3 by hydrogen.…”

Section: Introductionmentioning

confidence: 99%

“…These delocalized p electrons are observed as a density of state (DOS) at the Fermi level. The other two free electrons form a s bond between the adjacent M-M atoms, measured at 1.4 eV in the case of MoO 2 [10][11][12][13]. The metallic function of MoO 2 phase, formed in the reduction process, dissociates hydrogen molecules to active hydrogen atoms.…”

Section: Introductionmentioning

confidence: 99%

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