多孔钼钛氧化物的自支撑制备及其结构转变

Self Supported Synthesis of Porous Molybdenum-titanium Oxide and the Resulting Structural Transformation

通过MoO_3与TiO_2相互支撑的方法制备了一系列多孔钼钛氧化物,并在此基础上研究了该材料结构在随焙烧温度变化过程中的转变机制,通过XRD、BET、FESEM、TG/DTG等表征分析,当焙烧温度低于600℃时,MoO_3呈固体状态,通过MoO_3与TiO_2相互支撑可以制备出比表面积高达182 m2/g的介孔钼钛氧化物,可负载更多分散良好的MoO_3,其加氢脱硫性能显著优于常规浸渍法制备的催化材料;当焙烧温度高于600℃时,MoO_3呈熔融状态,"自支撑效应"消失,钼钛氧化物孔结构发生坍塌。

A series of porous molybdenum-titanium oxide （Mo-TiO2） were prepared by mutual support of MoO3 and TiO2, and the resulting structural transformation with calcination temperature was also studied in the present study. The as-prepared samples were characterized mainly by XRD, BET, FESEM, and TG/DSC. When the calcination temperature was lower than 600℃, MoO3 can maintain solid state. Mesoporous Mo-TiO2 with surface area of 182 m2/g was obtained via mutual support of MoO3 and TiO2. The oxide loaded by more well-dispersed MoO3 possessed significantly better hydrodesulfurization performance than that prepared by impregnation did. As MoO3 was fused at above 600℃, ＂self supported effect＂ was disappeared and the porous structure of Mo-TiO2 collapsed finally.