Distribution of Silicon and Aluminium Atoms as Well as Surface Acid Properties of Aluminated β Zeolite

Abstract

Abstract: The changes of surface properties of Hβ including distribution of silicon and aluminium atoms as well as surface acid properties after treatment by NaAlO₂ were studied. The samples were characterized by XRD, NH₃-TPD, Pyridine-IR, ²⁹Si MAS NMR and ²⁷Al MAS NMR. The surface properties of Hβ zeolite changed after NaAlO₂ aqueous solution treatment as follows: the total acid amount increased, Bronsted acid sites and Lewis acid sites increased. NaAlO₂ aqueous solution treatment of zeolite beta may has function of realumination at a Si(0Al)_A site by an isomorphous substitution Al(OH)₄^- anions. The results of activity for disproportionation and trans-alkylation of toluene and C₉ aromatics over samples with and without NaAlO₂ solution treatment were also compared. The comparison results show that the sample with NaAlO₂ solution treatment has a higher aromatics conversion and a higher (B+X) selectivy, which indicates that the catalytic activity of zeolite beta increase as a result of NaAlO₂ solution treatment due to a change in the surface acid properties.

Key words: Aluminated &beta, zeolite, Isomorphous substitution mechanism, Distribution of silicon and aluminium, Surface acidity

CLC Number:

O643

TrendMD:

BAO Jia-Qing, XIE Zai-Ku, LU Xian, CHEN Qing-Ling . Distribution of Silicon and Aluminium Atoms as Well as Surface Acid Properties of Aluminated β Zeolite[J]. Chem. J. Chinese Universities, 2002, 23(10): 1930.

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Distribution of Silicon and Aluminium Atoms as Well as Surface Acid Properties of Aluminated β Zeolite

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