Organic materials have seldom been used in vapor-phase reaction due to their poor thermal stability. To solve this problem, toluene vapor-phase oxidation catalyst was fabricated by supporting vanadium oxide onto graphitic carbon nitride (g-C3N4), an organic material with excellent thermal and oxidative stability. The nitrogen-rich property provides g-C3N4 with abundant anchoring sites, leading to high dispersion of vanadium oxide. When used as catalysts for the oxidation of toluene, V-g-C3N4 exhibited greatly improved activity and selectivity to benzaldehyde compared to traditional catalyst. After the vapor-phase reaction at 330 A degrees C for 6 h, no marked deactivation was observed. The TGA, XRD, FT-IR and XPS results revealed that V-g-C3N4 keeps constant during this high-temperature process. [GRAPHICS] .