| 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 |
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| 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、29SiNMR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。 |
| 关键词: β沸石 铝源 硅铝比 表征 |
| 基金项目: |
| Abstract: 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 TEAin 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 DSCspectra. TGAweight loss and DSCendotherm are related to the SiO2/Al2O3 ratio in synthesized Beta zeolite. |
| Keywords: β-zeolite aluminum source SiO2/Al2O3 characterization |
| 投稿时间：1999-09-14 修订日期：1999-12-01 |
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| 谢在库,陈庆龄,张成芳,朱支蔷,朱明.不同铝源合成的β沸石结构表征与热分解行为的研究[J].无机化学学报,2000,16(4):567-572. |
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