摘要
采用前驱晶种液诱导合成策略,以廉价的硅溶胶和硫酸铝为硅源和铝源、四丙基氢氧化铵(TPAOH)为模板剂、氟化铵为晶体生长调节剂制备了b轴厚度在50~200 nm范围的纳米片ZSM-5分子筛。考察了前驱晶种液的类型和添加量及氟化铵的用量对纳米片形貌的影响。结果表明,具有明显MFI晶体特征的前驱晶种液难以诱导形成纳米片ZSM-5,而无MFI晶体特征的前驱晶种液可以有效诱导合成ZSM-5纳米片。前驱晶种液的胶粒粒径对合成的纳米片尺寸有着决定性的影响,前驱晶种液的胶粒粒径越大所对应合成的纳米片尺寸也越大。随着氟化铵的加入纳米片的c轴被逐渐变长,随着前驱晶种液的增加纳米片b轴长度逐步下降。通过前驱晶种液和氟化铵添加量的优化调节,可以合成不同轴向长度的ZSM-5纳米片。
ZSM-5 zeolite nanosheets with b-axis thickness ranging from 50 nm to 200 nm are synthesized through using a protozeolite seed suspension induction strategy,with inexpensive silica sol and aluminum sulfate as silicon and aluminum sources,respectively,tetrapropylammonium hydroxide(TPAOH)as a template agent,and ammonium fluoride as a crystal growth regulator.The influences of the type and dosage of protozeolite seed suspension as well as the addition quantity of ammonium fluoride on the morphology of the nanosheets are investigated.Results show that protozeolite seed suspension with evident MFI crystal characteristics is less effective in inducing the formation of ZSM-5 nanosheets,whereas those without MFI characteristics can effectively induce the synthesis of ZSM-5 nanosheets.The particle size of the colloid in protozeolite seed suspension impacts significantly the size of the synthesized nanosheets,larger colloidal particles result in larger nanosheets.The c-axis of the nanosheets gradually lengthens with the addition of ammonium fluoride,while the b-axis gradually shortens with an increasing dosage of protozeolite seed suspension.Through optimizing the dosage of protozeolite seed suspension and ammonium fluoride,ZSM-5 nanosheets with different axial lengths can be synthesized.
作者
焦宇霆
朱鹏
张越
于伊人
姚迪
张雄福
刘国东
JIAO Yu-ting;ZHU Peng;ZHANG Yue;YU Yi-ren;YAO Di;ZHANG Xiong-fu;LIU Guo-dong(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China)
出处
《现代化工》
CAS
CSCD
北大核心
2024年第12期171-175,共5页
Modern Chemical Industry
基金
大连理工大学-大连化物所合作项目资助(HX20230236)。
