| 姚红,朱杰,郑江涛,王杰,万于银,朱龙凤.晶种协同廉价有机模板导向合成高纯度MCM-49沸石[J].分子催化,2018,32(6):565-573 |
| 晶种协同廉价有机模板导向合成高纯度MCM-49沸石 |
| Rational Seed-Directed Synthesis of Highly-Pure MCM-49 Zeolite Using a Low-Cost Organic Template |
| 投稿时间：2018-08-19 修订日期：2018-09-25 |
| DOI： |
| 中文关键词: MCM-49沸石 晶种导向 环己胺 廉价有机模板 |
| 英文关键词:MCM-49 zeolite seed-directed cyclohexylamine low-cost organic template |
| 基金项目:国家自然科学基金（21802053、21773094）；浙江省自然科学基金（LY15B030008）；大学生科研训练计划项目（SRT2018B071）. |
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| 中文摘要: |
| 采用廉价低毒性的环己胺（CHA）作为有机模板剂，并合理添加少量MCM-49沸石晶种，在静态水热条件下成功合成了高纯度MCM-49沸石.研究了起始凝胶组成（如Al2O3/SiO2，H2O/SiO2，CHA/SiO2，晶种/SiO2，Na2O/SiO2）、晶化温度和时间等因素对合成MCM-49沸石的影响.通过XRD、SEM、N2吸附、固体27Al和29Si MAS NMR等手段表征产物，结果表明合成的MCM-49沸石具有良好的结晶度、均匀的晶体尺寸、高比表面积和纯的四配位Al3+物种.热重差热分析（TG-DTA）和固体13C MAS NMR表征结果证实CHA是作为模板剂填充在沸石产物的孔道内.这种合成MCM-49的方法具有廉价和低毒性的特点，对其产业应用有潜在的重要价值. |
| 英文摘要: |
| Unlike previous reports stating that costly organic templates are essential to synthesize MCM-49 zeolite, A low-cost cyclohexylamine (CHA) is an efficient organic template for synthesis of MCM-49 zeolite using MCM-49 zeolite as seed. The effects of the reaction compositions, including the molar ratios of Al2O3/SiO2, H2O/SiO2, CHA/SiO2, seed/SiO2, Na2O/SiO2, on the synthesis of the pure product were investigated using different temperature and synthesis time. Physicochemical characterization with a combination of techniques including X-ray diffraction, scanning electron microscopy, N2 sorption isotherms, and solid 27Al and 29Si magic angle spinning nuclear magnetic resonance shows that the zeolitic product has good crystallinity, uniform crystals, high surface area, and tetrahedral Al3+ species. The thermogravimetric-differential thermal analysis, and solid 13C magic angle spinning nuclear magnetic resonance show that CHA acts as a template in the product obtained. The low-cost route for synthesis of MCM-49 zeolite would be potentially important for industrial application in the near future. |
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