铁钼氧化物TPD-MS及催化性能的研究  

STUDIES ON TPD-MS OF Fe-Mo OXIDES AND ITS CATALYTIC ACTIVITIES FOR SELECTIVE TOLUENE OXIDATION

作　　者：上官荣昌[1] 葛欣[1] 

机构地区：[1]南京大学化学系,南京210093

出　　处：《燃料化学学报》2000年第3期257-261,共5页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金! (2 99730 13);南京大学现代分析中心测试基金

摘　　要：制备了一系列不同配比的Fe-Mo氧化物催化剂 ,采用比表面积、XRD、FT -IR和LRS等方法 ,考察了催化剂的有关物化性质 ,测定了对甲苯选择性氧化生成苯甲醛的催化活性。用TPD -MS技术研究了催化剂表面氧物种的脱附。结果表明 ,随着样品中Fe/Mo含量的改变 ,表面氧物种的脱附峰的峰温、氧脱附量和脱附活化能Ed 也发生变化。 3# 样品 (Fe/Mo =0 2 9)的氧脱附峰峰温较低 ,表面氧物种O-和O2 -脱附量最大 ,Ed 值最小 。WT4”BZ]A series of Fe-Mo oxide catalysts with different Fe/Mo atomic ratio are prepared and applied to selective oxidation of toluene to benzaldehyde The structure of the catalysts is characterized by XRD,FT-IR,LRS The nature of oxygen species on the surfaces of these samples is studied by using temperature-programmed desorption-mass spectrography (TPD-MS) technique The results show that the oxygen species of multiple adsorption exists on the sample surface And in the range of desorption temperature <1000℃ , for the Fe-Mo samples, not only the desorption peaks of O - species on surfaces of samples occurred, but also the O 2- species appeare As the content of Fe in Fe-Mo oxides was changed, the activation energy of oxygen desorption(E d) also is changed The E d value of sample 3(Fe/Mo=0 29) is the lowest and its selectivity for benzaldehyde in toluene oxidation is the highest Thus, there is a parallel relation between the E d value and the selectivity for benzaldehyde on these Fe-Mo oxides

关 键 词：表面氧脱附 甲苯 氧化 铁钼氧化物 TPD-MS 

分 类 号：O643.36[理学—物理化学] TQ426.82[理学—化学]