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Selective CO Methanation over Ru Catalysts Supported on Nanostructured TiO2 with Different Crystalline Phases and Morphology
Gui-ying Wang,Yu-xian Gao,Wen-dong Wang*,Wei-xin Huang
Author NameAffiliationE-mail
Gui-ying Wang CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Yu-xian Gao CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Wen-dong Wang* CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China wangwd@ustc.edu.cn 
Wei-xin Huang CAS Key Laboratory of Materials for Energy Conversion and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Abstract:
Nanostructured titanium dioxides were synthesized via various post-treatments of titanate nanofibers obtained from titanium precursors by hydrothermal reactions. The microstruc-tures 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 de-termined. 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.
Key words:  Selective CO methanation, Ru catalyst, Titanium dioxide, Microstructure
FundProject:
不同晶相结构和形貌TiO2负载Ru催化剂的CO选择甲烷化
王桂英,高玉仙,汪文栋*,黄伟新
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TiO2和TiO2-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.
关键词:  CO选择甲烷化,Ru催化剂,二氧化钛,微结构
DOI:10.1088/1674-0068/25/04/475-480
分类号: