Study on Catalyst for the Preparation of Methylstyrene by Dehydrogenation of Methyl-ethylbenzene from Carbon-nine Raw Materials
In this experiment,the Fe-K-Mo catalyst for the dehydrogenation of methylethylbenzene to methyl styrene was prepared,and it was determined that:Reaction temperature 600～620℃,water-hydrocarbon ratio(mass ratio)2.5～3.0,liquid space velocity 0.7～1.0 h-1 are the optimum conditions for the dehydrogenation of methyl ethylbenzene.The effects of calcination temperature,iron source,potassium-iron ratio and promotor Mo on catalyst performance were studied,the results show that the catalyst has good conversion and selectivity under calcination temperature of 850℃,Fe(NO3)3 iron source,potassium to iron ratio of 0.25 and promotor Mo;XRD and TPR tests indicate that K2Fe22O34 phase is the main active component of methyl ethylbenzene dehydrogenation;The addition of Mo additive has obvious effect on improving the structure and activity of the catalyst,and also improves the thermal stability and oxidation resistance of Fe-K catalyst.
methyl ethylbenzenemethyl styrenedehydrogenation catalystFeKpromotor Mo
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