ZSM-5/MCM-41复合分子筛的合成与表征

张君涛; 郝娜娜; 王妮

ZSM-5/MCM-41复合分子筛的合成与表征

1.
西安石油大学石油炼化工程技术研究中心, 陕西西安 710065;
2.
上海新佑能源科技有限公司, 上海 201210;
3.
汉中市天然气投资发展有限公司, 陕西汉中 723000

详细信息

通讯作者:
张君涛(1971-),男,甘肃天水人,博士,副教授,主要从事炼油化工工艺及催化新材料研究,Email:zhangjt@xsyu.edu.cn。

中图分类号: O643.36
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出版历程
- 收稿日期: 2013-02-25
- 修回日期: 2013-05-03
- 刊出日期: 2013-10-30

Synthesis and characterization of ZSM-5/MCM-41 composite molecular sieves

1.
Research Center of Petroleum Processing & Petrochemicals, Xi’an Shiyou University, Xi’an 710065, China;
2.
Shanghai New-unity Energy Technology Co., LTD, Shanghai 201210, China;
3.
Hanzhong Natural Gas Investment Development Co., LTD, Hanzhong 723000, China

摘要

摘要: 以碱处理的ZSM-5浆液为硅铝源,通过水热自组装过程合成了介孔-微孔复合孔道结构的分子筛,并采用XRD、BET、HRTEM、Py-IR和水热处理等手段对合成分子筛进行了表征。结果表明,碱处理ZSM-5时的苛刻程度是影响复合分子筛合成的重要因素,适宜的碱处理条件为NaOH浓度1 mol/L、80℃时处理1 h。表征结果表明,复合分子筛具有规整互通的微孔-介孔梯级复合孔道结构,孔容、比表面积和平均孔径分别为0.63 mL/g,684 m²/g和3.76 nm,属典型的MCM-41结构;与MCM-41相比,复合分子筛的B酸(尤其是强B酸)酸量明显增强,水热稳定性显著提高。
- 微孔-介孔复合分子筛 /
- ZSM-5 /
- MCM-41 /
- 水热合成
Abstract: ZSM-5/MCM-41 composite molecular sieves with multiple micro-mesoporous structure were hydrothermally synthesized via self-assembly by using the alkali-treated ZSM-5 seriflux as the source of silica and aluminum. The as-synthesized molecular sieves were characterized by XRD, N₂ adsorption, HRTEM, Py-IR, and hydrothermal treatment methods. The results showed that the crystallinity of the as-synthesized molecular sieves is dependent on the intensity of the alkali-treatment; the suitable alkali treatment conditions for ZSM-5 are 80℃ for 1 h with a NaOH concentration of 1 mol/L. The composite molecular sieves obtained exhibit a typical MCM-41 structure, with a hierarchical micro-mesoporous structure and large specific surface area. Compared with MCM-41, the ZSM-5/MCM-41 composite molecular sieves show higher quantity of Bronsted acid sites (especially strong ones) and higher hydrothermal stability.
- micro-mesoporous composite molecular sieve /
- ZSM-5 /
- MCM-41 /
- hydrothermal synthesis

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