WOx nanoclusters highly dispersed on titania nanofibers
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
WOx-TiO2 catalysts with different W contents on titanium oxide nanofibers were prepared by impregnation of (NH4)2WO4 aqueous solution and annealed in air at 400 oC. X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and Raman spectroscopy were used for chemical and structural characterization. The results revealed that the support consisted of β-titanium oxide nanofibers with WOx species highly dispersed on the nanofibers saturating the surface at a concentration around 30 wt%. With an increase in the W concentration to 40 and 50 wt%, a crystalline WO3 phase segregates from the support, growing as large WO3 crystallites, whereas the support remains homogeneously decorated by WOx nanoclusters with dimensions around 1.0 nm. The W atoms remained octahedrally coordinated with a W = O Raman vibrating band at 974 cm−1.
Abstract
WOx-TiO2 catalysts with different W contents on titanium oxide nanofibers were prepared by impregnation of (NH4)2WO4 aqueous solution and annealed in air at 400 oC. X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and Raman spectroscopy were used for chemical and structural characterization. The results revealed that the support consisted of β-titanium oxide nanofibers with WOx species highly dispersed on the nanofibers saturating the surface at a concentration around 30 wt%. With an increase in the W concentration to 40 and 50 wt%, a crystalline WO3 phase segregates from the support, growing as large WO3 crystallites, whereas the support remains homogeneously decorated by WOx nanoclusters with dimensions around 1.0 nm. The W atoms remained octahedrally coordinated with a W = O Raman vibrating band at 974 cm−1.
참고문헌 (18)
- M.C. Daniel, , Chem. Rev, 104, pp.293~346 (2004)
- T.V.W. Janssens, "A. Puig-Molina and B.S. Clausen", J. Catal, 240, pp.108~113 (2006)
- N. Lopez, , J. Catal, 223, pp.232~235 (2004)
- C.H. Lin, , Catal. Lett, 98(1), pp.61~66 (2004)
- H. Borchert, , J. Catal, 247, pp.145~154 (2007)
- M.A. Cortes-Jacome, , J. Solid State Chem, 179, pp.2663~2673 (2006)
- T. Kim, , J. Catal, 246, pp.370~381 (2007)
- D.G. Barton, , J. Catal, 181, pp.57~72 (1999)
- S. Eibl, , Langmuir, 17, pp.107~115 (2001)
- M.A. Cortes-Jacome, , Appl. Catal, 318, pp.178~189 (2007)
- M.A. Cortes-Jácome, , Chem. Mater, 19, pp.6605~6614 (2007)
- M.A. Cortes-Jacome, , Catal. Today, 126, pp.248~255 (2007)
- J.A. Toledo-Antonio, , J. Phys. Chem. C, 111, pp.10799~10805 (2007)
- P.M. Voyles, , Nature, 416, pp.826~829 (2002)
- R. Ma, , J. Phys. Chem. B, 109, pp.6210~6214 (2005)
- D.V. Bavykin, , Chem. Mater, pp.1124~1129 (2006)
- S. Loridant, , J. Phys. Chem. B, 109, pp.5631~5637 (2005)
- B. Xu, , J. Catal, 193, pp.88~95 (2000)