不同铝源合成的β沸石结构表征与热分解行为的研究  

Study on the Structure Characterized and the Process of Thermal Decomposition of Beta Zeolite Synthesized by two Kind of Aluminum Sources

作　　者：谢在库[1] 陈庆龄[2] 张成芳[1] 朱支蔷[2] 朱明[2] 

机构地区：[1]华东理工大学化工工艺研究所,上海200237 [2]上海石油化工研究院,上海201208

出　　处：《无机化学学报》2000年第4期567-572,共6页Chinese Journal of Inorganic Chemistry

摘　　要：考察了以固体硅胶为硅源、 NaAlO2及α Al2O3· H2O两种铝源、以及不同晶化混合液的 SiO2/Al2O3比（ 15～ 50）对β沸石合成的影响。通过 XRD、 DSC/TGA、 29Si NMR及 ICP研究表明，以 NaAlO2为铝源合成的β沸石更易形成 Si(0Al)、 Si(1Al)、 Si(O－ )配位，且化学 SiO2/Al2O3比与晶化混合液 SiO2/Al2O3比基本一致，以α Al2O3· H2O为铝源合成的β沸石更易形成 Si(0Al)、 Si(O－ )、 Si(2Al)配位，且化学 SiO2/Al2O3比低于晶化混合液的 SiO2/Al2O3比； TGA失重量随β沸石 SiO2/Al2O3比增加而增加， DSC吸热量随β沸石 SiO2/Al2O3增加而减少。The influence of SiO2/Al2O3 ratio ranging from 15 to 50 and influence ofα Al2O3· H2O and NaAlO2 as aluminium sources on the synthesis of beta zeolite have been systematically studied by using XRD, 29Si NMR and ICP. NaAlO2 as aluminium source in beta zeolite synthesis,Si tends to form Si(0Al), Si(1Al) and Si(O－ ) sites, and the SiO2/Al2O3 ratios in beta zeolite and in gel are found to be consistent.α Al2O3· H2O as aluminium source in beta zeolite synthesis,Si tends to form Si(0Al), Si(O－ ) and Si(2Al) sites, and the SiO2/Al2O3 ratio in beta zeolite is lower than that of in gel. In addition, the process of thermal decomposition of TEA in beta zeolite was discussed using DSC and TGA. Under air flow with high heating rate (20℃· min－ 1), Hofmann degradation reaction mechanism was observed and there are 3～ 4 endotherm peaks on DSC spectra. TGA weight loss and DSC endotherm are related to the SiO2/Al2O3 ratio in synthesized Beta zeolite.

关 键 词：Β沸石 铝源 硅铝比 热分解 结构 催化剂 

分 类 号：TQ426.6[化学工程] O643.36[理学—物理化学]