通过不同制备方法合成的Ti/FSM-16上CO₂与H₂O的表征及光催化还原
Characterization and photocatalytic reduction of CO2 with H2O on Ti/FSM-16 synthesized by various preparation methods.
作者信息
Ikeue K, Mukai H, Yamashita H, Inagaki S, Matsuoka M, Anpo M
机构信息
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, Sakai, Japan.
出版信息
J Synchrotron Radiat. 2001 Mar 1;8(Pt 2):640-2. doi: 10.1107/s0909049500013674.
Ti/FSM-16 photocatalysts were prepared by various methods and their reactivity for the photocatalytic reduction of CO2 with H2O at 323 K was investigated. UV irradiation of Ti/FSM-16 in the presence of CO2 and H2O led to the formation of CH4 and CH3OH. The photocatalytic reactivity and selectivity differed remarkably by variations in the preparation method. Analyses of the UV-Vis absorption and XAFS spectra showed that the dispersion and local structure of the Ti-oxide species greatly depended on the preparation method. The formation of CH3OH was found to be related to the local structure of the Ti-oxide species while the yield of the photoluminescence was attributed to the charge transfer excited state of the highly dispersed tetrahedrally coordinated Ti-oxide species. Methanol formation was found to be more efficient on Ti/FSM-16 having such highly dispersed tetrahedrally coordinated Ti-oxide species.
通过多种方法制备了Ti/FSM - 16光催化剂，并研究了它们在323K下光催化用H₂O还原CO₂的反应活性。在CO₂和H₂O存在下对Ti/FSM - 16进行紫外线照射会导致CH₄和CH₃OH的形成。制备方法的变化导致光催化反应活性和选择性有显著差异。紫外 - 可见吸收光谱和XAFS光谱分析表明，氧化钛物种的分散情况和局部结构很大程度上取决于制备方法。发现CH₃OH的形成与氧化钛物种的局部结构有关，而光致发光的产率归因于高度分散的四面体配位氧化钛物种的电荷转移激发态。发现在具有这种高度分散的四面体配位氧化钛物种的Ti/FSM - 16上甲醇的形成效率更高。
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