Effect of the sol-gel conditions on the morphology and SCR performance of electrospun V-W-TiO2 catalysts. (July 2018)

• Record Type: Journal Article
• Authors: Marani, Debora; Silva, Rafael Hubert; Dankeaw, Apiwat; Gudik-Sørensen, Mads; Norrman, Kion; Hansen, Kent Kammer; Esposito, Vincenzo
• Is Part Of: Journal of physics and chemistry of solids. Volume 118(2018)
• Page Start: 255
• Page End: 261
• Publication Date: 2018-07
• Subjects: Nanofibers -- Electrospinning -- Titania -- SCR; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2018.03.018
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: V-W-TiO2 catalysts are prepared as nanofibers for the removal of the NOx in exhausts via the NH3 Selective Catalytic Reduction (SCR) method. By combining electrospinning and soft chemistry, materials are processed as nanofibers with the catalytic components ( e. g. V2 O5 -WO3 ) incorporated as dopants into the supporting anatase phase ( e. g TiO2 ). The conditions for the chemical synthesis were investigated by varying the molar ratios between titanium alkoxide (tetraisopropoxide) and the chelating agent (acetic acid). Catalytic characterization clearly shows an impact of the starting precursor coordination on the final nanostructure, and thus on the catalytic performances. Superior NOx conversion are obtained for nanofibers formed by high coordination level, i.e. [Acetic acid]/[Ti cation] > 2, with high stability and control over the processing route. Highlights: V-W-doped titania nanofibers were synthesized via electrospinning. Spinning solutions were prepared starting from alkoxides precursors. The effect of the chelating agent content on morphology and performances was explored. Optimized nanofibers exhibited remarkable high performances.