Mo/γ-Al2O3 catalysts for the oxidative dehydrogenation of propane.

Abello, M. Cristina; Gómez, Manuel F.; Ferretti, Osmar A.

doi:10.1016/s0926-860x(00)00680-3

Cited by 121 publications

(54 citation statements)

References 40 publications

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“…From the previous discussions, it was also evident that the anatase to rutile phase transformation occurred in the vanadia-based samples. The lower anatase to rutile transformation temperature observed in the high vanadia containing samples is suggested to be due to: (i) the high mobility of V in the structure, (ii) incorporation of V in the titania anatase structure, and (iii) introduction of distortions into the respective structures 36,37 . The reduction behavior of the catalysts investigated by the H 2 -TPR technique and the results for the nanomaterials prepared are presented in Figure 5.…”

Section: Catalyst Characterization Resultsmentioning

confidence: 95%

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Kazemeini

Nikkhah

Fattahi

et al. 2016

Chem.Biochem.Eng.Q.

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Samples of V 2 O 5 catalysts supported on nanostructures of TiO 2 and γ-Al 2 O 3 were synthesized through the hydrothermal method and used for the oxidative dehydrogenation of propane (ODHP) to propylene. The TiO 2 support was utilized in both commercial microstructure and synthesized nanostructure forms. Moreover, the γ-Al 2 O 3 support was synthesized through chemical and precipitation methods. The vanadium catalyst was then deposited onto the hybrid of the TiO 2 and γ-Al 2 O 3 materials. All prepared catalysts were characterized through the BET, FESEM, FTIR, XRD and TPR techniques. Performances of the synthesized catalysts were subsequently examined in a fixed-bed reactor. The main products were propylene, ethylene and CO x . The prepared catalysts over TiO 2 and γ-Al 2 O 3 were evaluated under reactor test conditions of 500 °C, feed of C 3 H 8 /air with molar ratio of 0.6, and total feed flow rate of 90 mL min -1 . These resulted in optimum values of 35.53 and 23.88 % for the propylene selectivity and propane conversion, respectively 6 h after the start of the reaction. The comparison of performances made between the synthesized materials and those available in the open literature for the ODHP reaction was indeed satisfactory.

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Section: Catalyst Characterization Resultsmentioning

confidence: 95%

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Kazemeini

Nikkhah

Fattahi

et al. 2016

Chem.Biochem.Eng.Q.

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“…The decrease in Lewis acidity can be associated with the coordination of VO X species on the support, and the increase in Brönsted acidity to the V-OH groups of the VOH 4 -2 and V 2 O 7 H 2 -2 species on the support (Ferreira and Volpes, 1999). In studies on TPD of NH 3 adsorption on Mo/γ-Al 2 O 3 , some authors (Abello et al, 2001) Brazilian Journal of Chemical Engineering Vol. 23, No.…”

Section: Resultsmentioning

confidence: 99%

Characterization and catalytic behavior of MoO3/V2O5/Nb2 O5 systems in isopropanol decomposition

Paiva

Monteiro

Zacharias

et al. 2006

Braz. J. Chem. Eng.

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-The influence of molybdenum oxide as a promoter on the V 2 O 5 /Nb 2 O 5 system was investigated. A series of MoO 3 /V 2 O 5 /Nb 2 O 5 catalysts, with MoO 3 loading ranging from 1 to 3 wt% MoO 3 and fixed V 2 O 5 content (21 wt%), were prepared by impregnation of the Nb 2 O 5 support with an aqueous solution of ammonium metavanadate and ammonium molybdate. The acid-base properties of the catalysts were investigated to determine of the selectivity of the isopropanol decomposition reaction. The X-ray diffraction results showed the presence of the β-(Nb,V) 2 O 5 phase. The temperature-programmed reduction profiles showed that the reducibility of vanadium was affected by the presence of molybdenum oxide. Activity results for isopropanol decomposition revealed that the acid-base properties of V 2 O 5 /Nb 2 O 5 catalysts are affected upon incorporation of MoO 3 , specifically for loadings of 3 wt %. For this catalyst composition both propylene and acetone formation rates decreased.

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“…The structures of the supported Mo have been extensively investigated utilizing a variety of structural characterization techniques [1,[5][6][7][8][9]. Mo/Al 2 O 3 catalysts are often referred to as monolayer systems, due to the tendency of the active phase to spread over the support at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Catalytic dehydrogenation of cyclohexene over MoO3/γ-Al2O3 catalysts

Kady

Shaban

Naga

2011

Transition Met Chem

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A series of MoO 3 /c-Al 2 O 3 catalysts with different Mo surface densities (Mo atoms/nm 2 ) has been prepared by incipient wetness impregnation method. Structural characteristics of the prepared catalysts were investigated by atomic absorption spectroscopy, X-ray diffraction, Fourier Transform Infrared spectroscopy, N 2 adsorption at -196°C, and temperature-programmed reduction (TPR). The catalytic activities of the prepared catalysts were tested by cyclohexene conversion between 200 and 400°C. XRD results indicated that molybdenum oxide species were dispersed as a monolayer on the support up to 4.04 Mo atoms/nm 2 , and the formation of crystalline MoO 3 was observed above this loading. FTIR and TPR results showed that molybdenum oxide species were present predominantly in tetrahedral form at lower loading, and polymeric octahedral forms were dominant at higher loading. Cyclohexene conversion reaction proceeded mainly through the simple dehydrogenation pathway in the studied temperature range 200-400°C and was found to be highly dependent on MoO 3 dispersion.

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Mo/γ-Al2O3 catalysts for the oxidative dehydrogenation of propane.

Cited by 121 publications

References 40 publications

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Physicochemical Properties and Catalytic Performances of Nanostructured V2O5 over TiO2 and γ-Al2O3 for Oxidative Dehydrogenation of Propane

Characterization and catalytic behavior of MoO3/V2O5/Nb2 O5 systems in isopropanol decomposition

Catalytic dehydrogenation of cyclohexene over MoO3/γ-Al2O3 catalysts

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