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Al–Si-beta and Ti–Si-beta were synthesized by the aging–drying method in fluoride medium without seeding and using tetraethylammonium hydroxide as organic structure-directing agent (OSDA). In the aging–drying method the gels are allowed to release some volatile species (mainly ethanol and water).Samples were aged and dried during about one week. Organic solvents were added to selected aged–dried gels to determine their role as complementary OSDA. All samples were hydrothermally treated at 140 ℃ during 1–12 days. After crystallization, samples were characterized by PXRD, SEM, TGADTG, FTIR, atomic absorption, low temperature nitrogen adsorption, 29Si MAS NMR and 27Al MAS NMR. Pure and well-crystallized zeolite beta samples were obtained in all experiments performed. Polymorph A enrichments of about 69% and 64% were reached for Ti and Al loaded samples, respectively. Al-loaded samples exhibited small average crystal sizes compared with Ti-loaded samples. The incorporation of Al in the beta framework was proven by several techniques and the Al/Si ratios were similar to those of the precursor gels. However, Ti incorporation was quite low. |
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5楼2012-01-06 15:19:13
2楼2012-01-06 12:39:14
【答案】应助回帖
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爱与雨下(金币+5): 2012-01-06 20:08:08
爱与雨下: 鼓励新虫~！ 2012-01-06 20:08:14
南宫辞(金币+20, 翻译EPI+1): ★有帮助 2012-01-07 15:57:06
爱与雨下(金币+18): 2012-01-31 10:03:19
爱与雨下: bb代发！ 2012-01-31 10:03:25
爱与雨下(金币+5): 2012-01-06 20:08:08
爱与雨下: 鼓励新虫~！ 2012-01-06 20:08:14
南宫辞(金币+20, 翻译EPI+1): ★有帮助 2012-01-07 15:57:06
爱与雨下(金币+18): 2012-01-31 10:03:19
爱与雨下: bb代发！ 2012-01-31 10:03:25
| Al–Si-β和Ti–Si-β在氟化物介质中在不接种和使用氢氧化四乙铵作为有机结构导向剂（OSDA）情况下，通过老化-干燥法合成。在老化-干燥法中，允许硅胶释放一些挥发物种（主要是乙醇和水）。在约一周时间里，样本被老化和干燥。有机溶剂被加入选定的老化-干燥的硅胶中，以测定他们作为辅助OSDA的作用。所有的样本在1-12天的时间在140C进行热液处理。结晶后，通过PXRD、SEM、TGADTG、FTIR、原子吸收、低温氮吸收、29Si MAS NMR和27Al MAS NMR去定它的具体特征。在进行所有的实验中，获得存的和良好结晶的沸石β样本。Ti和Al实验的样本分别达到约69%和64%的多形体A富集。Al实验样本较Ti实验样本现实较小的结晶尺寸。在β框架中引入Al已经被若干技术证明，并且Al/Si的比例与前体硅胶相似。然而，引入Ti是相当的低。 |
3楼2012-01-06 15:16:39
4楼2012-01-06 15:18:17
