کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
59993 | 1419453 | 2013 | 5 صفحه PDF | دانلود رایگان |

Surface acid sites of hierarchical mesoporous ZSM-5 zeolite synthesized by steam-assisted crystallization were characterized by NH3 temperature-programmed desorption and in-situ infrared spectroscopy. Compared with the conventional ZSM-5 zeolite, the hierarchical ZSM-5 zeolite had a lower concentration of surface acid sites. However, the hierarchical structure had more Lewis acid sites and, more importantly, much more external active sites as confirmed by 2,6-di-tert-butylpyridine infrared spectroscopy. Such hierarchical structure exposed more acid sites on the external surface, which subsequently lead to higher catalytic activity in reactions involving bulky molecules, such as o-xylene isomerization.
Hierarchical mesoporous ZSM-5 zeolite synthesized by the steam-assisted crystallization method exposes lots of acid sites on the external surface, thereby improving catalytic activity in the isomerization of o-xylene.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 34, Issue 7, July 2013, Pages 1429–1433