P-HZSM-5和SAPO-34复合分子筛在甲醇制丙烯反应中的应用  

Application of P-HZSM-5 and SAPO-34 composite molecular sieves for methanol to propylene

作　　者：苏蛟蛟 徐文鹏 韩丽[1] 芦天亮 徐军[1] SU Jiao-jiao;XU Wen-peng;HAN Li;LU Tian-liang;XU Jun(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学化工学院,河南郑州450001

出　　处：《应用化工》2022年第3期639-643,652,共6页Applied Chemical Industry

基　　金：国家自然科学基金(21802125)。

摘　　要：采用等体积浸渍的方法对HZSM-5分子筛进行磷改性。通过将磷改性前后的HZSM-5分别与SAPO-34分子筛通过机械混合法和水热晶化法制备成复合分子筛,分别用XRD、SEM、FTIR、NH_(3)-TPD、BET等手段对分子筛样品的物化性质、酸性和孔结构进行表征分析。对比分析了磷改性和复合分子筛的两种制备方法对甲醇制丙烯(MTP)反应催化性能的影响。结果表明,磷改性HZSM-5分子筛的强酸强度和数量明显下降,丙烯选择性也得到了提升。而分子筛的机械混合改变了催化剂的酸性和孔结构,使得其在MTP反应中有较高的丙烯选择性和较长的催化寿命。在磷改性后的HZSM-5与SAPO-34分子筛机械混合得到的S/PZ-M分子筛上,MTP反应结果表明,反应进行30 h时,丙烯的选择性高达51.34%,丙烯/乙烯比为3.93。The HZSM-5 molecular sieve was modified with phosphorus by equal volume impregnation.The HZSM-5 before and after phosphorus modification and SAPO-34 molecular sieve were prepared into a composite molecular sieve through mechanical mixing method and hydrothermal method respectively.Using XRD,SEM,FTIR,NH_(3)-TPD,and BET and other methods to characterize and analyze the physical and chemical properties,acidity and pore structure of molecular sieve samples.The effects of P modification and two preparation methods on the catalytic performance of composite molecular sieves in methanol to propylene(MTP)reaction were investigated.The results showed that the strength and the number of the strong acid of the phosphorus-modified HZSM-5 molecular sieve are significantly reduced,and the selectivity of propylene has been improved.The mechanical mixing of molecular sieves changes the acidity and pore structure of the catalyst,and has a higher propylene selectivity and a longer catalyst life in the MTP reaction.On the composite molecular sieve S/PZ-M obtained by mechanically compounding phosphorus-modified HZSM-5 and SAPO-34,the MTP reaction results showed that the selectivity of propylene was as high as 51.34%after 30 h of reaction,and the production ration between propylene and ethylene ratio is 3.93.

关 键 词：甲醇制丙烯 复合分子筛 P-HZSM-5和SAPO-34分子筛 磷改性 

分 类 号：TQ426.61[化学工程]