摘要
采用穆斯堡尔谱,X-射线衍射和程序升温还原等方法,研究了乙苯脱氢铁钾系催化剂中氧化钛对铁钾活性相KFe_(11)O_(17)结构形成的影响。发现添加适量的氧化钛对形成KFe_(11)O_(17)物相有利,当催化剂中Fe_2O_3,K_2O,CeO_2和Mo_2O_3的质量比固定为75.0:12.0:7.0:3.0,而Fe_2O_3与TiO_2质量比为75.0:0.1时,TiO_2对铁钾尖晶石结构形成的促进作用最明显,催化剂的活性也最高。但当TiO_2添加的质量比继续提高,会抑制铁钾尖晶石的形成,从而使催化剂的活性下降。当Fe_2O_3与TiO_2的质量比为75.0:1.0时,催化剂内的铁钾尖晶石结构遭到破坏。
Influence of TiO2 on formation of KFe11O17 active phase and catalytic activity of catalyst for ethylbenzene dehydrogenation to styrene were studied by means of Mossbauer spectroscopy, X-fraction diffraction （XRD） and TPR techniques. It was found that adding appropriate TiO2 to Fe-K-Ce-Mo system could strengthen the interaction between Fe2O3 and K2O, enhances the catalytic activity and promote the formation of the active phase KFe11O17 for ethylbenzene dehydrogenation. When TiO2 was superfluous, the pinel crystal structure was destroy and the catalytic activity was declined. The appropriate mass ratio of TiO2 to Fe2O3 was 0. 1 ： 75.0. No KFe11O17 could be observed when the mass ratio of TiO2 to Fe2O3 was 1.0 ： 75. 0.
出处
《化学反应工程与工艺》
EI
CAS
CSCD
北大核心
2007年第3期259-262,278,共5页
Chemical Reaction Engineering and Technology
关键词
乙苯
脱氢
苯乙烯
氧化钛
铁钾尖晶石
ethylbenzene
dehydrogenation
styrene
titanium oxide
spinel crystal structure
