Control of the crystal morphology of vohpo4 center dot 0. 5h(2)o precursors prepared via light alcohols-assisted solvothermal synthesis and influence on the selective oxidation of n-butane - Université de Lille Accéder directement au contenu
Article Dans Une Revue Journal of Catalysis Année : 2019

Control of the crystal morphology of vohpo4 center dot 0. 5h(2)o precursors prepared via light alcohols-assisted solvothermal synthesis and influence on the selective oxidation of n-butane

M. T. Nguyen Dinh
  • Fonction : Auteur
T. L. Nguyen
  • Fonction : Auteur
M. D. Phan
  • Fonction : Auteur
L. Nguyen Dinh
  • Fonction : Auteur
Q. D. Truong
  • Fonction : Auteur

Résumé

The catalytic performance of vanadyl pyrophosphate (VPP) catalysts in the oxidation of n-butane to maleic anhydride (MA) depends strongly on the display of the active and selective {0 0 1} faces, that may be controlled during the preparation of VOHPO4·0.5H2O precursor by solvothermal technique using C2 to C4 alkanoic alcohols. Intercalated metastable vanadyl-alkyl-phosphates were formed when linear alcohols (ethanol, n-butanol) were used, at variance with iso-alcohols. {0 0 1} platelets of VOHPO4·0.5H2O yielded {2 0 0} platelets to (VO)2P2O7 in nitrogen or in situ in the reactor, as revealed by structural analyses. The catalysts prepared in ethanol or n-butanol in situ activated at 440 °C were more active and selective to MA than in iso-alcohols, but if the equilibration was performed at 380 °C the influence of alcohol was mitigated. The highest MA yield was obtained with the ethanol-derived catalyst, which exhibited the smallest platy crystallites of (VO)2P2O7, as well as surface V5+ species as seen by XPS.
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Dates et versions

hal-04442647 , version 1 (06-02-2024)

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Citer

M. T. Nguyen Dinh, T. L. Nguyen, M. D. Phan, L. Nguyen Dinh, Q. D. Truong, et al.. Control of the crystal morphology of vohpo4 center dot 0. 5h(2)o precursors prepared via light alcohols-assisted solvothermal synthesis and influence on the selective oxidation of n-butane. Journal of Catalysis, 2019, Journal of Catalysis, 377, pp.638-651. ⟨10.1016/j.jcat.2019.08.004⟩. ⟨hal-04442647⟩
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