La/Hβ-Al<sub>2</sub>O<sub>3</sub>复合材料改善轻汽油醚化活性

颜曦明; 王宝宇; 柯明; 张海燕; 石海信

doi:10.13801/j.cnki.fhclxb.20180316.005

La/Hβ-Al₂O₃复合材料改善轻汽油醚化活性

1.
钦州学院石油与化工学院, 广西高校北部湾石油天然气资源有效利用重点实验室, 钦州 535011;
2.
钦州学院海洋学院, 钦州 535011;
3.
中国石油大学(北京) 重质油国家重点实验室, 北京 102249

基金项目: 广西自然科学基金（2017GXNSFBA198145）；广西高校北部湾石油天然气资源有效利用重点实验室开放课题基金（2017KLOG04）；钦州学院引进人才科研启动基金（2017KYQD231）

详细信息

通讯作者:
颜曦明,博士,讲师,研究方向为石油与天然气催化转化,E-mail:yanximing@qzhu.edu.cn

中图分类号: TE624.4
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出版历程
- 收稿日期: 2017-11-29
- 修回日期: 2018-02-06

La/Hβ-Al₂O₃ composite materials improve light gasoline etherification activity

1.
Guangxi Colleges and Universities Key Laboratory of Beibu Gulf oil and Natural Gas Resource Effective Utilization, College of Chemistry and Chemical Engineering, Qinzhou University, Qinzhou 535011, China;
2.
Ocean College, Qinzhou University, Qinzhou 535011, China;
3.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China

摘要

摘要: 采用La³⁺交换法制备La/Hβ-Al₂O₃复合材料，用于改善轻汽油的低温醚化活性。借助XRD、XRF、BET、FTIR、NH₃-TPD、PyIR、FETEM-EDX等分析手段对复合材料的理化性能进行表征，其中XRD、XRF、BET和FTIR的表征结果显示，少量La³⁺的引入对复合材料的晶相结构和骨架结构无明显破坏作用，而适度的La³⁺交换反而具有扩孔效果；NH₃-TPD和PyIR的分析结果表明，经La³⁺交换后复合材料的酸量和酸强度有所减弱，但引入的La³⁺可以形成新的B酸中心，使中强酸比例和B酸中心数目得到提高；FETEM-EDX分析结果证实镧物种主要存在于复合材料中的Hβ分子筛上。对该复合材料的低温醚化活性评价结果显示，La³⁺交换法可以改善复合催化剂的轻汽油醚化活性，催化剂0.1 La/Hβ-Al₂O₃表现出最佳活性，产物甲基叔戊基醚收率最高可达58.13%。对该催化剂进行300 h寿命考察，证实其具有较好稳定性及可再生性。
- 轻汽油 /
- 醚化 /
- La³⁺交换 /
- 复合材料 /
- 清洁生产
Abstract: The La/Hβ-Al₂O₃ composite materials were prepared by method of lanthanum ion-exchange and used to improve the low-temperature etherification activity of light gasoline. The physical chemical properties of composite materials were characterized by a series of analytical methods, such as XRD, XRF, BET, FTIR, NH₃-TPD, PyIR and FETEM-EDX. The results of XRD, XRF, BET and FTIR show that introduction of a small amount of lanthanum ions has no obvious effect on the crystalline phase and skeleton structure of the composite materials, on the contrary, moderate lanthanum ion exchange has the effect of pore-enlarging. The analysis results of NH₃-TPD and PyIR show that acid content and acid strength of the composite materials have been weakened, but the introduction of lanthanum ions can form a new Brønsted acid site, which increases the ratio of medium strong acid and the amount of Brønsted acid sites. The results of FETEM-EDX analysis confirm that the lanthanum species are mainly present in the Hβ molecular sieve of composite materials. The evaluation results of etherification activity of this composite material show that the method of lanthanum ion-exchange can improve the light gasoline etherification activity of composite catalyst, in which the sample 0.1 La/Hβ-Al₂O₃ shows the best activity, and the yield of methyl tertiary amyl ether is up to 58.13%. The 300 h life test results show that it has good stability and reproducibility.
- light gasoline /
- etherification /
- lanthanum ion-exchange /
- composite materials /
- cleaner production