Effect of the Support on the Oxidation of Heptane Using Vanadium Supported on Alkaline Earth Metal Hydroxyapatites

Dasireddy, Venkata D.B.C.; Singh, Sooboo; Friedrich, Holger B.

doi:10.1007/s10562-014-1424-0

Cited by 7 publications

(4 citation statements)

References 61 publications

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“…In addition, Friedrich et coll. observed similar decrease of specific surface areas on the vanadium impregnated hydroxyapatites (Ca, Sr, Mg, Ba) and they mentioned that corresponding pyrovanadate phase was formed in the as prepared samples for V2O5 weight loading higher than 10% (corresponding to 3 wt% V loading, Table 2, entries 12, 13) [89][90][91]. They evaluated the performance of these catalysts for n-heptane or n-octane oxidative dehydrogenation reactions (Table 2, entries, 12-14) [89][90][91][92].…”

Section: Modifications By Vanadate Anionssupporting

confidence: 56%

“…observed similar decrease of specific surface areas on the vanadium impregnated hydroxyapatites (Ca, Sr, Mg, Ba) and they mentioned that corresponding pyrovanadate phase was formed in the as prepared samples for V2O5 weight loading higher than 10% (corresponding to 3 wt% V loading, Table 2, entries 12, 13) [89][90][91]. They evaluated the performance of these catalysts for n-heptane or n-octane oxidative dehydrogenation reactions (Table 2, entries, 12-14) [89][90][91][92]. The vanadium pentoxide, which is the dominant dispersed phase in the lower loading (2.5 wt% in V2O5, corresponding to 0.7 wt% in vanadium) gave high selectivity towards octenes and low selectivity towards aromatics [90].…”

Section: Modifications By Vanadate Anionssupporting

confidence: 56%

“…Although greatly dependent on the synthesis conditions, the highest propylene selectivity was obtained for the vanadium system. The vanadium impregnated system was also used for the oxidative dehydrogenation of n-heptane (Table 2, entry 12) and n-octane (Table 2, entries 13, 14) that were taken as models for medium chain length linear paraffins [89][90][91][92]. Beside octenes, other mild oxidation products were formed in increasing proportions as the vanadium loading increases.…”

Section: Catalytic Performance Of the Metal Modified Hydroxyapatite I...mentioning

confidence: 99%

“…In the HA structure, among the two types of lattice oxygen species present in phosphate and hydroxyl groups, the involvement of O 2from PO4 3was discarded on the basis on the much lower activity of Ca3(PO4)2 compound compared to that of hydroxyapatite [113]. On the contrary, based on the progressive deactivation associated with the conversion of hydroxyapatite into corresponding chloroapatites in the presence of tetrachloromethane in the feed stream and to the rather low activities observed on chloroapatite [113,114], it was inferred that hydroxyl groups must somehow participate to the activation process of light alkanes [58,89,95,104]. However, hydroxyl groups being weak bases [115,116], it was also underlined that it would be surprising that OHgroups of HA directly contribute to hydrogen abstraction of alkanes [95,104].…”

Section: Activation Site and Mechanismmentioning

confidence: 99%

See 3 more Smart Citations

Aerobic Selective Oxidation of Alcohols and Alkanes overHydroxyapatite‐BasedCatalysts

Costentin

Launay

2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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Selective oxidation catalysis is of prime importance for the production of many key intermediates. The control of selectivity in the presence of gaseous oxygen is quite challenging and requires the development of efficient catalysts. Thanks to their large composition range, resulting from the modulation of their stoichiometry and substitution ability, hydroxyapatites can be modified by many metals which make them original catalytic systems gathering both tunable acid-base properties and redox properties. In this chapter, we will show the interest of metal modified hydroxyapatite catalysts for various classes of oxidation reactions. Due to their large range of stability, they can be implemented either in liquid phase for aerobic oxidation of alcohols (Pd, Ru), or at very high temperature (> 600°C) for gas phase alkane oxidation, partial oxidation of methane (Rh, Ni) and oxidative dehydrogenation of other alkanes (V, Co…). The influence of the metal incorporation method (ion exchange, impregnation in excess of solution, or coprecipitation) on the metal dispersion and catalytic performance will be discussed. Finally, the role of the basic properties of hydroxyapatites in the alkane activation will be discussed.

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Section: Modifications By Vanadate Anionssupporting

confidence: 56%

Section: Modifications By Vanadate Anionssupporting

confidence: 56%

Section: Catalytic Performance Of the Metal Modified Hydroxyapatite I...mentioning

confidence: 99%

Section: Activation Site and Mechanismmentioning

confidence: 99%

See 2 more Smart Citations

Aerobic Selective Oxidation of Alcohols and Alkanes overHydroxyapatite‐BasedCatalysts

Costentin

Launay

2022

Design and Applications of Hydroxyapatite‐Based Catalysts

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Activation of C−H Bond of Propane by Strong Basic Sites Generated by Bulk Proton Conduction on V‐Modified Hydroxyapatites for the Formation of Propene.

et al. 2020

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Insights into the catalytic transformation of propane to propene on V-apatite catalysts are provided based on structure-reactivity relationships. Substitution of phosphates by vanadates in the hydroxyapatite structure leads to the formation of Ca 10 (PO 4 ) 6-x (VO 4 ) x (OH) 2-y O y V-oxy-hydroxy-apatite solid solutions (x = 0!6). Bulk vanadium incorporation promotes (i) calcium rich terminations (XPS, CO adsorption), (ii) proton deficiency inside the OH À channels ( 1 H NMR) giving rise to O 2À native species, (iii) the thermally-activated formation of additional O 2À species along the OH À channels resulting in H-bonding interaction (in situ DRIFT) and (iv) the proton conduction process that eventually results in the surface exposure of O 2À species (in situ impedance spectroscopy). The exposure of Ca 2 + À O 2À surface acid-base pairs allows the dissociation of hydrogen, emphasizing the strong basicity of the related O 2À species. Whereas an increasing vanadium content is beneficial to propene selectivity, it scarcely impacts propane conversion. The reaction proceeds mainly upon oxidative dehydrogenation, even if the minor dehydrogenation route is also observed. Surface O 2À generated thanks to proton mobility are involved in the CÀ H bond activation, as shown by the synergistic effect between the oxidative dehydrogenation of propane reaction and the bulk proton conduction measured under operando conditions. This puts emphasis on the key role of strong basic sites for propane activation.the temperature was cooled down to 673 K and the conductivity set-up was fed with the reacting feed. The H + ion-conductivity of the working catalyst was measured after 2 hours on stream at 673, 723 and 773 K.

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Life cycle sustainability assessment of optimized biodiesel production from used rice bran oil employing waste derived-hydroxyapatite supported vanadium catalyst

Pradhan

Karan

Chakraborty

2021

Environ Sci Pollut Res

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Effect of the Support on the Oxidation of Heptane Using Vanadium Supported on Alkaline Earth Metal Hydroxyapatites

Cited by 7 publications

References 61 publications

Aerobic Selective Oxidation of Alcohols and Alkanes overHydroxyapatite‐BasedCatalysts

Aerobic Selective Oxidation of Alcohols and Alkanes overHydroxyapatite‐BasedCatalysts

Activation of C−H Bond of Propane by Strong Basic Sites Generated by Bulk Proton Conduction on V‐Modified Hydroxyapatites for the Formation of Propene.

Life cycle sustainability assessment of optimized biodiesel production from used rice bran oil employing waste derived-hydroxyapatite supported vanadium catalyst

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