碱处理对Hβ分子筛催化苯胺缩合制二苯胺性能的影响

发布时间：2018-05-20 02:34

本文选题：Hβ分子筛 + 碱处理　；参考：《石油学报(石油加工)》2017年01期

【摘要】：用NaOH溶液对SiO_2/Al_2O_3摩尔比为25的Hβ分子筛进行碱处理脱硅,得到了含有多级孔的BEA结构分子筛,并采用X射线衍射、N_2吸附-脱附、扫描电子显微镜、透射电子显微镜、X射线荧光光谱、程序升温脱附(NH_3-TPD)、傅里叶转换红外光谱等方法对处理前后的分子筛样品进行表征,并采用固定床反应器考察了其催化苯胺缩合制二苯胺的活性。结果表明,温和的碱溶液处理在基本保持Hβ分子筛微孔骨架结构的同时,增加了Hβ分子筛的介孔比表面积和介孔体积,并调变了酸量,有效地改善了反应物和产物的扩散性能,使催化苯胺缩合反应的苯胺转化率、二苯胺选择性均有不同程度的提高,同时催化剂表现出更强的抗失活能力。
[Abstract]:H 尾 molecular sieve with SiO_2/Al_2O_3 molar ratio of 25 was treated with NaOH solution to desilication. The BEA molecular sieve with multi-pore structure was obtained. The BEA molecular sieve was adsorbed and desorbed by X ray diffraction (XRD) N2, scanning electron microscope (SEM). The molecular sieve samples before and after treatment were characterized by transmission electron microscope (TEM) X-ray fluorescence spectra, temperature programmed desorption of NH _ 3-TPD _ (2) and Fourier transform infrared spectroscopy (FTIR). The catalytic activity of aniline condensation to diphenylamine was investigated in a fixed-bed reactor. The results show that the mild alkali solution treatment can increase the mesoporous specific surface area and mesoporous volume of H 尾 molecular sieve while maintaining the micropore skeleton structure of H 尾 molecular sieve, and adjust the acid content, thus effectively improving the diffusibility of reactants and products. The conversion of aniline and the selectivity of diphenylamine in the condensation reaction of aniline were improved to some extent, and the catalyst showed stronger ability to resist deactivation.
【作者单位】：南京工业大学材料化学工程国家重点实验室;南京工业大学化学化工学院;江苏飞亚化学工业有限责任公司;
【基金】：国家科技支撑计划(2011BAE18B01) 国家自然科学基金青年基金(21306089) 江苏省高校自然科学基金面上项目(13KJB530006)资助
【分类号】：O643.36

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