Enhanced Heat Conductivity And Catalytic Performance Of Extruded TS-1 Catalyst

Titanium silicalite-1?TS-1?catalyzes the epoxidation of 1-butene to prepare 1,2-epoxybutane which is a strong exothermic reaction.Due to the poor heat conduction property of extrusion molding TS-1 which lead to more heat accumulation in catalyst interior,the side reactions are aggravated leading to catalyst deactivation.To improve the heat conduction property,high thermal conductivity?SiC and Cu?was mixed with TS-1 powder to extrusion molding,and the 1-butene epoxidation performance of extrusion molding catalyst was investigated in fixed bed reactor.The main results are shown as follows:1.With the increasing amount of SiC,the heat conduction performance of extrusion molding TS-1became better.The stability of the catalyst improved.2.The heat conduction performance of extrusion molding TS-1 improved with the increasing amount of the Cu.Which was improved the stability of TS-1 extrudates.may be the result of a combination of ammonia and heat transfer in the reaction system with ammonia.However,some of the Cu powder was oxidized to Cu₂O causing faster invalid decomposition of H₂O₂ and decreasing yield of 1,2-epoxybutane.It's disadvantage to the epoxidation of 1-butene.3.No matter adding ammonia water to the system,Cu₂O can cause invalid decomposition of H₂O₂.Without ammonia,the inactivation of TS-1 extrudates which was mixed Cu powder was fast.This is because acid center of both TS-1 extrudates and H₂O₂ made the ring of 1,2-epoxybutane open,which aggravated the side reactions.The accumulation of by-products in channel was the main factor leading to the deactivation.