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STUDY ON THE ACIDITY OF MODIFIED HY ZEOLITES PREPARED BY COMBINATION OF CHEMICAL DEALUMINATION AND HYDROTHERMAL TREATMENT

机译:化学脱铝加水热处理联合制备改性HY分子筛的酸性研究

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Acidity of modified HY zeolites prepared by combination of chemical dealuminationand hydrothermal treatment have been characterized by IR, MAS NMR and n-butylaminetitration. The results showed that by increasing the level of dealumination, the total amount ofacid sites decreased while the strongest acid sites (H0≤-8.2) increased. The strengthpopulation profile of acid sites revealed that only the aluminum atoms associated with thestronger acid sites(-8.2≤H0≤-5.6) were extracted from the framework, not that associated withweak acid sites during the dealumination steps. These results were correlated with thepopulation of Si(nAl) groupings obtained from the spectra of 29Si MAS NMR, indicating theincrease of the relative intensity of the Si(0Al) peak with simultaneous decrease that ofSi(2Al) peak. The acidity changes at each step of preparation procedure are discussed.
机译:化学脱铝和水热处理相结合制备的改性HY沸石的酸度已通过IR,MAS NMR和正丁胺滴定进行了表征。结果表明,通过提高脱铝水平,酸位总量减少,而最强酸位(H0≤-8.2)增加。酸性位点的强度总体分布表明,从骨架中仅提取了与强酸性位点(-8.2≤H0≤-5.6)相关的铝原子,而在脱铝步骤中未与弱酸性位点相关的铝原子。这些结果与从29Si MAS NMR光谱获得的Si(nAl)族群相关,表明Si(0Al)峰的相对强度增加,同时Si(2Al)峰的相对强度降低。讨论了制备过程中每个步骤的酸度变化。

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  • 会议地点 Montpellier(FR);Montpellier(FR)
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    College of Chemistry and molecular engineering Perking University Beijing 100871 China liqin@chemms.chem.pku.edu.cn;

    College of Chemistry and molecular engineering Perking University Beijing 100871 China;

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