纳米ZSM-5分子筛的磷改性  

Phosphorus modification of nano ZSM-5 zeolite

作　　者：熊晓云 张君屹[2] 胡清勋 王久江 孙启明 XIONG Xiaoyun;ZHANG Junyi;HU Qingxun;WANG Jiujiang;SUN Qiming(Lanzhou Petrochemical Research Center,PetroChina Petrochemical Research Institute,Lanzhou 730060,China;PetroChina Lanzhou Petrochemical Company,Lanzhou 730060,China;College of Chemistry,Chemical Engineering and Materials Science,Soochow University,Suzhou 215123,China)

机构地区：[1]中国石油石油化工研究院兰州化工研究中心,甘肃兰州730060 [2]中国石油兰州石化公司,甘肃兰州730060 [3]苏州大学材料与化学化工学部,江苏苏州215123

出　　处：《石油化工》2024年第10期1387-1393,共7页Petrochemical Technology

基　　金：中国石油基础研究专项(2023ZZ36);兰州市科学技术局科技计划项目(LZSKJ 2022-1-2)。

摘　　要：采用浸渍法制备了不同磷含量的工业微米ZSM-5分子筛(Z-0)和纳米ZSM-5分子筛(NZ-0),并利用XRD、低温N_(2)吸附-脱附、Py-IR、SEM、NH3-TPD等方法进行了表征,对结构性能进行了分析。实验结果表明,随着磷含量的增加,两种改性分子筛的结晶度、比表面积、孔体积、酸量均逐渐下降,改性磷含量建议不高于6%(w);与Z-0改性试样相比,NZ-0改性试样具有更高的结晶度保留率、介孔孔体积和比表面积,同时NZ-0改性试样的B酸酸量降幅更小,具有更高的B/L比值,且中强酸酸量降幅更小。与Z-6相比,采用NZ-6制备的丙烯助剂具有更高的丙烯产率。Industrial micron ZSM-5 zeolites(Z-0)and nanometer ZSM-5 zeolites(NZ-0)with different phosphorus contents were prepared by the impregnation method.Structural properties of the zeolites were characterized by XRD,low-temperature N_(2)adsorption and desorption,Py-IR,SEM,NH3-TPD,etc.The results show that the crystallinity,specific surface area,pore volume,and acid concentration of these two kinds of modified zeolite samples gradually decrease with the increase of modified phosphorus content.It is recommended that modified phosphorus content should not exceed 6%(w).Compared with the Z-0 modified samples,the NZ-0 modified samples have higher crystallinity preservation,mesoporous volume,and specific surface area.The NZ-0 modified samples show a smaller decrease in B acid amount,a higher B/L ratio,and a smaller decrease in the medium strong acid amount.Compared with Z-6,propylene additive prepared with NZ-6 has a higher yield of propylene.

关 键 词：ZSM-5分子筛 纳米 磷改性 催化裂化 孔结构 酸性 丙烯 

分 类 号：TQ426[化学工程]