Effect of V2O5 particles size on oxidation of m-xylene: Vapor-phase oxidation of m-xylene by using V2O5 encapsulated into the TiO2 lattice as an efficient and reusable catalyst. (23rd November 2018)

• Record Type: Journal Article
• Authors: Farahmand, Shohreh; Ghiaci, Mehran
• Is Part Of: Chemical engineering science. Volume 190(2018)
• Page Start: 5
• Page End: 13
• Publication Date: 2018-11-23
• Subjects: Vanadium pentoxide -- Titanium dioxide -- Polyvinylpyrrolidone -- m-xylene -- Isophthalic acid; Chemical engineering -- Periodicals; Génie chimique -- Périodiques; Chemical engineering; Periodicals; Electronic journals; 660
• DOI: 10.1016/j.ces.2018.06.013
• Languages: English
• ISSNs: 0009-2509

Abstract

Graphical abstract: Highlights: V2 O5 @TiO2 catalyst, with V2 O5 loadings from 10 to 20 wt% in matrix of mesoporous TiO2 . V2 O5 nanoparticles in a matrix of mesoporous TiO2 instead of immobilizing on TiO2 . The TiO2 network prevents leaching of the vanadium pentoxide nanoparticles. Abstract: The selectivity and over-oxidation obtained in the oxidation of m -xylene to isophthalic acid by V2 O5 nanoparticles encapsulated in TiO2 matrix are controlled by the size of the V2 O5 nanoparticles. In this reaction when the size of V2 O5 nanoparticles was less than 45 nm at least 16–30% of the m -xylene was lost as carbon oxides. In this work, V2 O5 @TiO2 catalysts, with V2 O5 loadings from 10 to 20 wt% were prepared by trapping V2 O5 nanoparticles in a matrix of mesoporous TiO2 . We demonstrate herein results of m -xylene oxidation in a fixed-bed reactor (i.d. = 10 mm) for production of isophthalic acid. The air-calcined samples of the catalysts were characterized by different techniques such as FT-IR, XRD, Diffuse-reflectance UV–Vis, FE-SEM, EDX, BET, XPS, and TEM. This novel configuration of V2 O5 particles in the TiO2 matrix not only prevents leaching of the catalyst but also improves the catalyst reusability. The optimal amount of V2 O5 trapped in the TiO2 matrix was 15 wt%. The best V2 O5 @TiO2 catalyst activation temperature was 350 °C.