Catalysts and related methods for photocatalytic production of H
Catalysts, catalytic systems and related synthetic methods for in situ production of H 2 O 2 and use thereof in reaction with oxidizable substrates.
1. A composition comprising a nanoparticulate TiO 2 core component, the nanoparticulate TiO 2 core component having a surface; a SiO 2 shell component coupled to and partially coating the surface of said core component; and transition metal moieties coupled to said shell component, said composition comprising pores comprising TiO 2 surface areas.
2. The composition of claim 1 wherein said transition metal moieties are selected from V, Ti, Cr, Mn, Co, Cu, Zn, Mo, Nb, Ta, W, Os, Re, Ir, and Sn moieties.
3. The composition of claim 2 wherein said transition metal moieties are Ti.
4. The composition of claim 1 wherein said SiO 2 shell component has a thickness dimension of about 1.5 nm to about 3.5 nm.
5. The composition of claim 4 wherein said transition metal moieties are Ti.
6. A composition comprising a nanoparticulate TiO 2 core component, the nanoparticulate TiO 2 core component having a surface; a porous SiO 2 shell component coupled to and partially coating the surface of said core component; and transition metal moieties coupled to said shell component, said composition comprising pores comprising TiO 2 surface areas.
7. The composition of claim 6 wherein said transition metal moieties are selected from V, Ti, Cr, Mn, Co, Cu, Zn, Mo, Nb, Ta, W, Os, Re, Ir, and Sn moieties.
8. The composition of claim 7 wherein said transition metal moieties are Ti.
9. The composition of claim 6 wherein said SiO 2 shell component has a thickness dimension of about 1.5 nm to about 3.5 nm.
10. The composition of claim 9 wherein said transition metal moieties are Ti.
11. A composition comprising a crystalline anatase nanoparticulate TiO 2 core component, the nanoparticulate TiO 2 core component having a surface; a porous SiO 2 shell component coupled to and partially coating the surface of said core component; and transition metal moieties coupled to said shell component, said composition comprising pores comprising TiO 2 surface areas.
12. The composition of claim 11 wherein said transition metal moieties are selected from V, Ti, Cr, Mn, Co, Cu, Zn, Mo, Nb, Ta, W, Os, Re, Ir, and Sn moieties.
13. The composition of claim 12 wherein said transition metal moieties are Ti.
14. The composition of claim 11 wherein said SiO 2 shell component has a thickness dimension of about 1.5 nm to about 3.5 nm.
15. The composition of claim 14 wherein said transition metal moieties are Ti.
16. The composition of claim 1 , wherein the transition metal moieties are grafted to the SiO 2 shell at dispersed sites.
17. The composition of claim 1 , wherein the transition metal moieties comprise transition metal cations.
18. The composition of claim 17 , wherein the transition metal moieties are thermocatalytically active for the epoxidation of an alkene in the presence of the alkene and H 2 O 2 .
19. The composition of claim 1 , where the transition metal moieties comprise tetrahedral Ti.
20. The composition of claim 16 , wherein the transition metal moieties comprise tetrahedral Ti and are thermocatalytically active for the epoxidation of an alkene in the presence of the alkene and H 2 O 2 .