低温型乙苯脱氢催化剂的制备及性能

Preparation and Property of Low Temperature Catalyst for Ethylbenzene Dehydrogenation

用X射线衍射(XRD)、乙苯脱氢反应、催速老化、X荧光分析等手段对新研制的低温乙苯脱氢制苯乙烯催化剂进行了表征。发现在Fe-K-Ce-Mo氧化物体系中添加质量占2%的ZnO,脱氢活性相KFe11O17的形成温度降低了50℃以上,从而使得脱氢温度下降5～17℃。研制得到的Fe-K-Ce-Mo-Zn脱氢催化剂机械强度达到20 0N/mm,且经过水浸泡实验后没有下降。而Fe-K-Ce-Mo样品,水浸泡后机械强度降低了近40%,说明添加ZnO的催化剂具有较高的机械强度和较好的耐水浸泡能力。1000h稳定性实验和催速老化实验结果表明,Fe-K-Ce-Mo-Zn催化剂具有良好的稳定性。

A new type of low temperature catalyst for ethylbenzene dehydrogenation to styrene was characterized by using XRD,dehydrogenation reaction,accelerated aging test and X-ray fluorescence analysis methods.It was found that addition of 2% of ZnO to Fe-K-Ce-Mo oxides system can lower the formation temperature of KFe11O17,the active phase of dehydrogenation,by more than 50 ℃,and thus decrease the dehydrogenation temperature by 5-17 ℃.The mechanical strength of this new Fe-K-Ce-Mo-Zn catalyst reaches 20.0 N/mm,and remains unchanged after water immersion test,while the value will decrease about 40% for Fe-K-Ce-Mo system after water immersion.It shows that the catalyst containing ZnO has high mechanical strength and good stability against moisture.Results of 1000 h stability test and accelerated aging test indicate that Fe-K-Ce-Mo-Zn catalyst possesses good stability for dehydrogenation reaction.