中文摘要：

用水热法得到的钛酸纳米纤维前体，通过不同后处理方法合成了多种纳米结构的TiO2,采用N2等温吸附和BET比表面、X射线衍射、透射电镜和能量分散X射线分析表征了TiO2及负载Ru催化剂的微结构，包括比表面、晶相结构和形貌以及Ru纳米颗粒尺寸分布等．对负载Ru催化剂在富氢条件下CO选择甲烷化反应活性测试表明：金红石相TiO2SHTiO2-B为载体负载的Ru催化剂比锐钛矿相TiO2负载的Ru催化剂表现出更高的反应性能．其活性区别说明了不同晶相结构和形貌TiO2载体与Ru纳米颗粒的相互作用存在差异．

英文摘要：

Nanostructured titanium dioxides were synthesized via various post-treatments of titanate nanofibers obtained from titanium precursors by hydrothermal reactions. The microstructures of TiO2 and supported Ru/TiO2 catalysts were characterized with X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray analysis, and nitrogen adsorption isotherms. The phase structure, particle size, morphology, and specific surface area were determined. The supported Ru catalysts were applied for the selective methanation of CO in a hydrogen-rich stream. The results indicated that the Ru catalyst supported on rutile and TiO2-B exhibited higher catalytic performance than the counterpart supported on anatase, which suggested the distinct interaction between Ru nanoparticles and TiO2 resulting from different crystalline phases and morphology.