分子筛催化剂孔道结构与聚乙烯催化裂解反应构效关系

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中图分类号：TQ426 文献标志码：A

Abstract：Inorder toclarifythestructure-activityrelationshipbetweenthemicroscopicporestructureofzeolitesandthereactionperformanceofpolyethylene，theperformanceofurzeolites withdiferentporestructures（regularmicroporous channels andcagestructures）inthecatalyticcracking reactionofpolyethylene were explored.Itisfound thatfor SAPO-34，thelong chainhydrocarbonsproducedbytheinitialthermalcrackingaredificulttoentertheporesofthezeoliteforcatalyticcracking，andtheproductsaremainlylongchainalkanes/lefins.Thermalcracking intermediatesaremorelikelytobecatalyticallycracked into lightolefins intheporesofZSM-5zeolites.ThelargeporesofBetaandUSYzeolitesprovideacertainspace forthesecondaryreactionsoflowcarbonolefins（suchasDiels-Alderreaction，cyclizationandaromatization），andthefinal products contain more aromatic hydrocarbons.Compared with Betazeolite，theuniquecage structureof USYlimits thecontactand furtherreactionofthereaction intermediates with someactivesites toacertain extent，andreduces theyieldof aromatics and light olefins.

Keywords：polyethylene；catalytic cracking；zeolites；pore structure；structure-activity relationship

聚乙烯（PE）是全球产量最大的塑料之一，广泛 应用于包装、建筑、电子等领域[1-4] 。（剩余13572字）