多孔钼钛氧化物的自支撑制备及其结构转变

通过MoO₃与TiO₂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, MoO₃呈固体状态, 通过MoO₃与TiO₂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MoO₃, 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, MoO₃呈熔融状态, “自支撑效应”消失, 钼钛氧化物孔结构发生坍塌。

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

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.