| 微波场中T型分子筛的合成及晶化研究(英文) | |
| Synthesis and Crystallization of Zeolite T by Microwave Heating | |
| 摘要: 研究了微波场中T型分子筛的结晶过程。考察了微波加热体系中合成参数如合成时间、溶胶组成、反应压力和模板剂用量对分子筛晶化的影响。微波加热的主要优点是减少合成时间，无模板剂的溶胶在普通加热条件下的晶化时间需要120 h，而在微波场中则仅需要20～25 h。另一方面，由于微波的快速加热特性促进了稳定相钙十字沸石的生成，从而减小了次稳定相T型分子筛的结晶区间。在未添加模板剂条件时，100 ℃下微波水热合成T型分子筛的结晶区间为：20≤nSiO2/nAl2O3≤22和0.31≤ nM2O/nSiO2≤0.33(其中M2O=Na2O+K2O, nNa/nK=3和nM2O/nSiO2=11.70)。在普通加热和微波加热合成体系中，添加模板剂均能扩大结晶区间，同时还可以进一步减少合成时间。 | |
| 关键词: T型分子筛 微波加热 普通加热 水热合成 机理 | |
| 基金项目: | |
| Abstract: The crystallization of Zeolite T under microwave-heating system was studied. The effects of synthesis parameters such as synthesis time, gel composition, reaction pressure and template on crystallization were investigated. The results show that the crystalline zeolite T is obtained in 20～25 h without template under the microwave hydrothermal treatment in contrast to more than 120 h by conventional heating method. The crystallization fields of the metastable phase of zeolite T is narrowed due to the favored formation of the stable phase of phillipsite by the fast heating of microwave irradiation. The formation fields of zeolite T without template under microwave hydrothermal synthesis are: 20≤nSiO2/nAl2O3≤22 and 0.31≤nM2O/nSiO2≤0.33(where M2O=Na2O+K2O, nNa/nK=3 and nM2O/nSiO2=11.70) at 100 ℃. The addition of template(tetramethylammonium(TMA) cation) will broaden the crystallization field of zeolite T and further reduce the synthesis time in both of the microwave-heating system and the conventional-heating system. | |
| Keywords: zeolite T conventional heating microwave heating hydrothermal crystallization mechanism | |
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| 周荣飞,付桂云,胡 娜,袁 慧,林 晓,徐南平,陈祥树.微波场中T型分子筛的合成及晶化研究(英文)[J].无机化学学报,2009,25(1):104-111. | |
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