The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N...The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N2 absorption-desorption and NH3-TPD.The results showed that the composite H6P2W18O62/TiO2 was mesoporous material(ca.3.3 nm),and large surface area(99.78 m2/g).Additionally,the aggregation of TiO2 particles was effectively inhibited,and the surface acidity was increased substantially.The photocatalytic elimination of monochlorobenzene was used as model reaction to evaluate the photocatalytic activity of the composite catalyst under visible light separately.Photocatalytic experimental results showed that the composite H6P2W18O62/TiO2 can effectively degradate monochlorobenzene.展开更多
In the paper, the author addresses the Lyapunov characteristic spectrum of an ergodic autonomous ordinary differential system on a complete riemannian manifold of finite dimension such as the d-dimensional euclidean s...In the paper, the author addresses the Lyapunov characteristic spectrum of an ergodic autonomous ordinary differential system on a complete riemannian manifold of finite dimension such as the d-dimensional euclidean space ? d , not necessarily compact, by Liaowise spectral theorems that give integral expressions of Lyapunov exponents. In the context of smooth linear skew-product flows with Polish driving systems, the results are still valid. This paper seems to be an interesting contribution to the stability theory of ordinary differential systems with non-compact phase spaces.展开更多
文摘The H6P2W18O62/TiO2composite catalyst was prepared by the combination of nonionic surfactant C18H37(OCH2CH2)10OH(Brij-76)as the template and the sol-gel method.As-synthesized composite was characterized by FT-TR,SEM,N2 absorption-desorption and NH3-TPD.The results showed that the composite H6P2W18O62/TiO2 was mesoporous material(ca.3.3 nm),and large surface area(99.78 m2/g).Additionally,the aggregation of TiO2 particles was effectively inhibited,and the surface acidity was increased substantially.The photocatalytic elimination of monochlorobenzene was used as model reaction to evaluate the photocatalytic activity of the composite catalyst under visible light separately.Photocatalytic experimental results showed that the composite H6P2W18O62/TiO2 can effectively degradate monochlorobenzene.
基金supported by the National Natural Science Foundation of China (Grant No. 10671088)the Major State Basic Research Development Program of China (Grant No. 2006CB805903)
文摘In the paper, the author addresses the Lyapunov characteristic spectrum of an ergodic autonomous ordinary differential system on a complete riemannian manifold of finite dimension such as the d-dimensional euclidean space ? d , not necessarily compact, by Liaowise spectral theorems that give integral expressions of Lyapunov exponents. In the context of smooth linear skew-product flows with Polish driving systems, the results are still valid. This paper seems to be an interesting contribution to the stability theory of ordinary differential systems with non-compact phase spaces.
