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锌含量对Zn/HZSM-5催化剂性能的影响
引用本文:尹双凤,林洁,于中伟.锌含量对Zn/HZSM-5催化剂性能的影响[J].催化学报,2001,22(1):57-61.
作者姓名:尹双凤  林洁  于中伟
作者单位:中国石油化工集团总公司石油化工科学研究院,
摘    要: 研究了不同锌含量的Zn/HZSM-5分子筛的表面酸性及其对正己\r\n烷芳构化反应的催化活性、选择性和稳定性.结果表明,锌组元的引入\r\n减少了HZSM-5表面的B酸,增加了L酸,总酸量增大;正己烷转化率随\r\n锌含量的增加先降低后升高;芳烃产率和芳构化选择性则随锌含量的增\r\n加先增大后趋于平缓;反应过程中催化剂的积炭速度、孔体积和比表面\r\n积下降速度都随着锌含量的增加而加快;锌含量大于1%时,Zn/HZSM\r\n-5的催化稳定性不如HZSM-5,且随着锌含量的增加失活速度加快.优\r\n选的锌含量为1.0%~2.9%.此外,讨论了Zn/HZSM-5的催化性能\r\n与其表面性质的关系.

关 键 词:  HZSM-5分子筛  表面酸性  稳定性  己烷  芳构化
文章编号:0253-9837(2001)01-0057-05
收稿时间:2001-02-25

Effect of Zinc Content on Properties of Zn/HZSM-5 Zeolite Catalyst
YIN Shuangfeng,LIN Jie,Yu Zhongwei.Effect of Zinc Content on Properties of Zn/HZSM-5 Zeolite Catalyst[J].Chinese Journal of Catalysis,2001,22(1):57-61.
Authors:YIN Shuangfeng  LIN Jie  Yu Zhongwei
Institution:YIN Shuangfeng,LIN Jie *,YU Zhongwei
Abstract:The surface properties of Zn/HZSM-5 zeolite with different zinc content and its catalytic performance for n-C6H14 aromatization were studied. The results showed that, by loading zinc, the Lewis acidity and the total acidity of HZSM-5 increased, while the Brnsted acidity decreased. With the increase of zinc content, the catalytic activity and aromatization selectivity were improved . The stability of the catalyst declined when the zinc content exceeded 1%, and the more zinc on HZSM-5, the more rapid did the catalyst deactivate. The prefer red zinc content in Zn/HZSM-5 is 1.0%~2.9%. It is supposed that the catalyti c properties of Zn/HZSM-5 is closely correlated with its surface acidity and sh ape-selectivity, as well as the dehydrogenation function of zinc component.
Keywords:zinc  HZSM  5 zeolite  surface acidity  stability  hexane  aromatization
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