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-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. 优选的锌含量为1.0%～2.9%. 此外,讨论了Zn/HZSM-5的催化性能与其表 面性质的关系.
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 Brnsted 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.
参考文献
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