Author:
Vlessidis A. G.,Evmiridis N. P.,Beagley B.,Armitage D. N.
Abstract
Abstract
The Cuprammine exchanged NaX zeolite (M = 17846, cubic, space group Fd[unk]m, a = 24,915(1) Å, V = 15466 Å3) is investigated for site occupancy by the cuprammonium ions. Intensity data are resolved into component hkl contributions by treating the known framework sites as conventional heavy atoms. Difference Fourier and least square methods were used to reveal and refine the intersticial Cu, Na, NH3 and water in hydrated samples. Final R = 0,09 for 75 F and σ-criterion for the refinement F 〉 3σ(F) were used.
It is found that 25% of the cuprammine species are located in I′(U) site [xxx with x = 0,100(2)], origin at centre ([unk]m) which is close to the centre of the sodalite cage while the rest is labile in the supercages.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
4 articles.
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1. Framework-Type Determination for Zeolite Structures in the Inorganic Crystal Structure Database;Journal of Physical and Chemical Reference Data;2010-09
2. Spectroscopic investigation on the chemical forms of Cu during the synthesis of zeolite X at low temperature;Applied Geochemistry;2006-06
3. 7 References;Zeolite-Type Crystal Structures and their Chemistry. Framework Type Codes DAC to LOV
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