TY - JOUR
T1 - Characterization and evaluation of Mo‒V‒Te‒Nb mixed metal oxide catalysts fabricated via hydrothermal process with ultrasonic pretreatment for propane partial oxidation
AU - Yang, Xiu Juan
AU - Feng, Ru Ming
AU - Ji, Wei Jie
AU - Au, Chak Tong
N1 - Funding Information:
Financial support was provided by Hong Kong Baptist University (FRG/06-07/I-08). The research activities conducted at NJU were financed by the NSFC (20673052) and JSNSF (BK2006112). X.J.Y. thanks Dr. Na Zhang for her kind help and fruitful discussions.
PY - 2008/1/1
Y1 - 2008/1/1
N2 - 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.
AB - 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.
KW - Acrylic acid
KW - Hydrothermal synthesis
KW - Mixed metal oxide
KW - Propane
KW - Ultrasonic treatment
UR - http://www.scopus.com/inward/record.url?scp=36849041491&partnerID=8YFLogxK
U2 - 10.1016/j.jcat.2007.10.020
DO - 10.1016/j.jcat.2007.10.020
M3 - Journal article
AN - SCOPUS:36849041491
SN - 0021-9517
VL - 253
SP - 57
EP - 65
JO - Journal of Catalysis
JF - Journal of Catalysis
IS - 1
ER -