Bubble-template synthesis of WO 3 ·0.5H 2 O hollow spheres as a high-activity catalyst for catalytic oxidation of benzyl alcohol to benzaldehyde

Well-shaped WO ₃ ·0.5H ₂ O hollow spheres are successfully prepared by a facile bubble-template method and they show high activity in catalytic oxidation of benzyl alcohol to benzaldehyde.