以碱液脱硅的方法在HZSM-5纯微孔分子筛中引入介孔，研究了多级孔结构对HZSM-5催化对异丙基苯酚脱烷基稳定性的影响。通过X射线衍射、N₂吸脱附和吡啶红外吸附等方法对催化剂进行了表征，重点考察了碱处理时间对催化剂孔结构及催化稳定性的影响。结果表明，介孔的引入增强了催化剂的稳定性，混合碱处理时间为3 h制备的DS3催化剂介孔量为330 m²/g，催化稳定性最优，反应8 h后转化率仅降低至82%，而母体催化剂转化率大幅度下降至37%。介孔引入对催化剂稳定性的提升主要源于积碳形成位置的改变，母体催化剂上形成了"碳层"结构，造成了微孔堵孔的现象，而DS3多级孔分子筛内部积碳的占比仅为14%。

Mesopores are formed in HZSM-5 pure micropore molecular sieves by desilication in alkali solution.The effects of hierarchical pore structure on the stability of HZSM-5 molecular sieves in catalyzing dealkylation of isopropylphenol are studied.The catalysts with hierarchical pore structure are characterized by X-ray diffraction,N₂ adsorption/desorption and FT infrared spectra of pyridine adsorption analysis methods.Influence of alkali treatment time on the pore structure and catalytic stability of the catalysts is investigated.Results show that mesopores enhance the stability of catalyst.DS3 catalyst that has been treated by alkali solution for 3 h possesses 330 m²·g^-1 of mesopores and exhibits the best catalytic stability.After 8 hours of reaction,the conversion of isopropylphenol over DS3 catalyst only decreases to 82% while that by parent catalyst decreases to 37%.Analysis on location of coke deposition reveals that the transportation of coke precursors from the micropores to the mesopores is the main cause of better stability.Micropore occlusion by the coke shell occurs on the parent catalyst,however,the proportion of coke deposition in the internal of DS3 catalyst is only 14%.

陈庭胜(1994-),男,硕士生,研究方向为工业催化,chentingsheng0546@link.tyut.edu.cn