摘要
研制了适合多乙苯脱氢制多乙烯苯的Ｆｅ－Ｋ－Ｃｅ复合型脱氢催化剂．助剂钾以钾霞石（ＫＡｌＳｉＯ４）方式引入，既克服了钾的大量流失，又保留了钾碱的抗积炭性能，使催化剂活性稳定．另一助剂ＣｅＯ２的加入对催化剂中的各组分起到了一定的分散作用，使催化剂晶粒度变小，并且提高了活性组分Ｆｅ２Ｏ３的还原温度，因而可增强催化剂的抗还原能力．
The catalyst for dehydrogenation of diethylbenzene (DEB) to divinylbenzene (DVB) was studied. Potassium promoted iron oxide catalyst was mainly used for ethylbenzene dehydrogenation. When potassium alkali or salt directly used as promoter, it is apparent that the loss of potassium component from the surface of catalysts pellet results in activity decay. We changed the method of adding potassium promoter as kaliophilite (KAlSiO 4). From the deposited carbon and activity tests of these catalysts, it is found that the change of way of adding potassium promoter not only keeps the depression of carbonaceous deposits but also controls the loss of potassium component, and thus the catalyst gives higher dehydrogenation activity. XRD indicated that the cerium in Fe 2O 3 KAlSiO 4 system plays a dispersion role and makes the surface composition of catalyst well distributed, which results in an increase in activity of dehydrogenation catalyst. The results of TPR show that the cerium promoter makes active component iron oxide be reduced difficultly and enhances the stability of catalyst. The composition of the catalyst No.3 is m (Fe 2O 3)∶ m (KAlSiO 4)∶ m (CeO 2)=60∶40∶3. This catalyst has good applicable characteristics in dehydrogenation reaction.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1997年第3期203-206,共4页
关键词
脱氢
催化剂
二乙苯
二乙烯苯
铁
助催化剂
Dehydrogenation catalyst, Iron oxide, Kaliophilite, Cerium oxide, Diethylbenzene, Divinylbenzene
