赤泥基ZSM-5分子筛的合成及其催化裂解性能  

Synthesis of red mud-based ZSM-5 zeolite and its catalytic cracking performance

作　　者：王晓峰 伏洪兵 顾恒硕 李福威 李志霞[1] WANG Xiao-feng;FU Hong-bing;GU Heng-shuo;LI Fu-wei;LI Zhi-xia(School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《应用化工》2022年第11期3178-3184,共7页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(22078076);广西自然科学基金资助项目(2020GXNSFAA159174);广西博世科环保科技股份有限公司国家企业技术中心开放基金(202100012)。

摘　　要：使用工业固废赤泥和水玻璃进行ZSM-5分子筛的制备研究,调查了赤泥碱熔活化、赤泥添加量、模板剂(四丙基溴化铵、葡萄糖)用量等合成因素;并对低密度聚乙烯进行催化裂解研究,考察其催化裂解性能。结果表明,赤泥经过碱熔活化后,硅酸铝被转化为了铝酸钠;将碱熔赤泥、四丙基溴化铵、葡萄糖、水玻璃、去离子水以1.5∶0.8∶3.6∶24∶18的质量比混合、水热晶化后得到了ZSM-5。并在剂料比为5∶3、500℃下进行裂解实验,液体和气体产率分别为13%和84%,其中单环芳烃和低碳烯烃(C_(2-4)^(=))选择性分别为47%和75%,在生产苯、甲苯、二甲苯及乙烯、丙烯等方面展示了较好的应用前景。ZSM-5 Zeolites were economically synthesized with industrial solid waste(red mud)and water glass as the raw materials.The effects of alkali fusion activation of red mud(AF-RM)and the addition amounts of AF-RM and templates(tetrapropylammonium bromide(TPABr),glucose)on the formation of zeolites were investigated.The catalytic performance of the synthesized zeolites were tested by cracking of low-density polyethylene.The results show that aluminum silicate in red mud can be transferred into sodium aluminate and sodium silicate by alkali fusion activation.ZSM-5 Can be obtained at a AF-RM∶TPABr∶glucose∶water glass∶deionized water mass ratio of 1.5∶0.8∶3.6∶24∶18.The obtained liquid and gaseous yields at catalyst-to-feed ratio of 5∶3 and 500℃are 13%and 84%,respectively.Thereinto,the selectivity to the monocyclic aromatics and light olefins(C_(2-4)^(=))are 47%and 75%,respectively,suggesting good application prospect in production of benzene,toluene,xylene,ethylene and propylene.

关 键 词：赤泥 固体废弃物利用 ZSM-5 催化裂解 低密度聚乙烯 

分 类 号：TQ426.8[化学工程]