NO Adsorption and the Distribution of NickeLIons on USY Zeolite and γ-Al2O3 and Their Mixture

Abstract

Abstract: The distribution of Ni²⁺ions on USY zeolite, alumina and their mixed carriers is studied according to their NO adsorption. When Ni²⁺ions locate on SⅡ、SⅡ、(SⅠ')、 sites of USY zeolite or on the surface of alumina, the IRspectra of their NO adsorption show the bands at 1905, 1900 or 1855-1871 cm^-1respectively. When NiO loading on NiO/Al-₂O-₃samples is less than 8%, the Ni²⁺ion distribution has an equilibrium between the surface and the bulk of γ -alumina. The proportion is about onethird. On USY zeolite, Ni²⁺ions prefer to occupy its S-Ⅰ sites rather than its S-Ⅱ, S-Ⅱ' and S-Ⅰ' sites. The tendency strengthens obviously with the increase of NiOloading. On MS mixed carriers, more Ni²⁺ions located on the surface of alumina than on S-Ⅱ and S-Ⅱ', S-Ⅰ' sites of USYzeolite. The number of Ni²⁺ions on the surface of alumina or on S-Ⅱ',S-Ⅰ' sites of USY zeolite increases greatly with increasing.

Key words: NO adsorption, USY zeolite, γ-lumina, NiO, Distribution of Ni²⁺

CLC Number:

O643.1

TrendMD:

NIU Guo-Xing, CAO Zhi-Song, LI Quan-Zhi, HUANG Yao, HUANG Yu-Fang . NO Adsorption and the Distribution of NickeLIons on USY Zeolite and γ-Al₂O₃ and Their Mixture[J]. Chem. J. Chinese Universities, 1999, 20(2): 254.

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NO Adsorption and the Distribution of NickeLIons on USY Zeolite and γ-Al₂O₃ and Their Mixture

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