| 高岭土碱热活化机理与4A沸石的水热合成 |
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| 引用本文： | 潘群雄,潘晖华,陆洪彬,苏建峰,陈东勇.高岭土碱热活化机理与4A沸石的水热合成[J].材料科学与工程学报,2009(4). |
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| 作者姓名： | 潘群雄 潘晖华 陆洪彬 苏建峰 陈东勇 |
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| 作者单位： | 盐城工学院材料学院;中国石化石油化工科学研究院石油化工催化材料与反应工程国家重点实验室; |
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| 基金项目： | 国家科技部973基金资助项目(2006CB202500.2); 江苏省生态环境材料重点实验室基金资助项目(XKY2007006) |
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| 摘 要： | 本文以碱热活化的高岭土为原料合成4A沸石。通过XRD、DSCI、R2、7Al MAS NMR等物化表征研究高岭土碱热活化机理。结果表明:在高岭土碱热活化过程中,碱起到矿化剂作用,碱活化了伴生惰性矿物石英,碱促进煅烧高岭土中六配位铝转变为活性四配位铝,碱促进硅铝聚合态向具有β笼结构的方钠石和高活性的偏硅酸钠的转变。高岭土和伴生结晶态石英最佳活化条件是n(Na2O)/n(Al2O3)为1,煅烧温度为600℃,保温2h。与热活化法相比,采用碱热活化法,高岭土的活化温度降低150℃-200℃,结晶态石英活化温度降低到600℃,Al3+主要以活性四配位铝形式存在。以碱热活化高岭土为原料水热合成4A沸石,4A沸石的成核期缩短,晶化速率加快。
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| 关 键 词： | 高岭土 碱热活化机理 方钠石 水热合成 4A沸石 |
Alkli-activated Mechanisms of Kaolinite and Hydrothermal Synthesis of 4A Zeolite |
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| PAN Qun-xiong,PAN Hui-hua,LU Hong-bin,SU Jian-feng,CHEN Dong-yong.Alkli-activated Mechanisms of Kaolinite and Hydrothermal Synthesis of 4A Zeolite[J].Journal of Materials Science and Engineering,2009(4). |
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| Authors: | PAN Qun-xiong PAN Hui-hua LU Hong-bin SU Jian-feng CHEN Dong-yong |
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| Affiliation: | PAN Qun-xiong~1,PAN Hui-hua~2,LU Hong-bin~1,SU Jian-feng~1,CHEN Dong-yong~1(1.School ofMaterials,Yancheng Institute of Technology,Yancheng 224003,China,2.State Key Laboratory of Catalytic Material , Reaction Engineering,Research Institute of Petroleum Processing,SINOPEC,Beijing 100083,China) |
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| Abstract: | 4A zeolite was hydrothermally synthesized using alkli-activated kaolinite.The alkli-activated mechanisms was investigated by means of X-ray diffractometry(XRD),differential scanning calorimeter(DSC),infrared spectroscopy(IR) and()~(27)Al magic angle spinning nuclear magnetic resonance(MAS NMR) spectroscopy.Experimental results show that during alkli-activation process,alkali acted as a mineralizer,activated the associated inert quartz,promoted the transformation from octahedral Al~(3+) into active tetrahedr... |
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| Keywords: | kaolinite alkli-activation mechanism sodalite hydrothermal synthesis 4A zeolite |
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