Characterization and evaluation of Mo‒V‒Te‒Nb mixed metal oxide catalysts fabricated via hydrothermal process with ultrasonic pretreatment for propane partial oxidation

Xiu Juan Yang, Ru Ming Feng, Wei Jie Ji*, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Mo1.00VxTe0.20Nb0.16On (x = 0.35 - 0.50) mixed-metal oxide catalysts were synthesized through ultrasonic and hydrothermal treatments. Both TeO2 and H6TeO6 were used as tellurium sources. The enhanced dispersion of TeO2 by ultrasonic treatment is crucial for obtaining an active and selective Mo{single bond}V{single bond}Te{single bond}Nb{single bond}O catalyst for acrylic acid (AA) formation from propane oxidation. The TeO2-derived Mo1.00VxTe0.20Nb0.16On (x = 0.35 - 0.41) are superior to their H6TeO6-derived counterparts; propane conversion and AA selectivity over the Mo1.00V0.41Te0.20Nb0.16On is 55% and 60 mol% at 380 °C, respectively, giving an AA formation rate of 22.3 μmol g-1 min-1. Based on the physicochemical properties of the catalysts, we propose that the ultrasonic treatment can give rise to (i) enhanced presence of the orthorhombic Te2M20O57 (M = Mo, V, Nb) and hexagonal Te0.33MO3.33 (M = Mo, V, Nb) phases, (ii) surface enrichment of Te, (iii) enhanced reactivity of lattice oxygen, (iv) an increase in Mo{single bond}O{single bond}Te and V{single bond}O{single bond}Te entities, and (v) better isolation of active sites.

Original languageEnglish
Pages (from-to)57-65
Number of pages9
JournalJournal of Catalysis
Volume253
Issue number1
DOIs
Publication statusPublished - 1 Jan 2008

Scopus Subject Areas

  • Catalysis
  • Physical and Theoretical Chemistry

User-Defined Keywords

  • Acrylic acid
  • Hydrothermal synthesis
  • Mixed metal oxide
  • Propane
  • Ultrasonic treatment

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