Kobayashi M, Miyoshi K. WO3-TiO2 monolithic catalysts for high temperature SCR of NO by NH3: Influence of preparation method on structural and physico-chemical properties, activity and durability [J]. Applied Catalysis B: Environmental, 2007, 72(3-4): 253-261. 这是一篇博士论文中写的,WO3小于4nm无法测出。