NSC94-EPA-Z-008-004

exhibit different structures and reactivity for the photocatalytic reduction of CO 2 and H 2 O.Ti-FSM-16 photocatalysts (Ti contents: 1%) were synthesized by four preparation methods,discriminated from (1) TiO2/FSM-16, (2) imp-Ti/FSM-16, (3) anc-Ti/FSM-16, (4)Ti/FSM-16.Figure 2.7 XAFS spectra of the Ti/FSM-16 photocatalysts prepared by various methods. Ticontent: 1 wt%. N: Coordination number. R: Ti-O bond distances (Å).In the XAFS spectra, Ti/FSM-16 and anc-Ti/FSM-16 showed an intense single pre-edgepeak which indicates that the Ti-oxide species of this photocatalysts exists in tetrahedralcoordination. The imp-Ti/FSM-16 and TiO2/FSM-16 exhibited a weak pre-edge, and thismeans there were octahedrally coordinated Ti-oxide on these photocatalysts.According to the EXAFS (FT-EXAFS) spectra of the photocatalysts, Ti-FSM-16 andanc-Ti/FSM-16 exhibited only Ti-O peaks, pointed out the isolated Ti-oxide species on thesephotocatalysts. For imp-Ti/FSM-16 and TiO2/FSM-16, an intense peak around 2.7Å as wellas Ti-O peak assigned to the neighboring Ti atoms (Ti-O-Ti).Through UV irradiation of these four photocatalysts, anc-Ti/FSM-16 and Ti-FSM-16with a highly dispersion of tetrahedrally coordinated Ti-oxide species showed highphotocatalytic reactivity and high yield of CH 3 OH formation.Ti-β zeolite is one of Anpo’s research. There are two types of Ti-β zeolites usinghydrothermal synthesis under different conditions using OH- and F- ion as anions of thestructure-directing agents (SDA). It was found that the Ti-β zeolites using OH- ions (Ti-β6