:Effect of Cation Exchange Treatment
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The effect of cation exchange treatment on some physico-chemical properties of mordenite tuff was investigated by X-ray powder diffraction, chemical analyses, thermal analyses and gaschromatography. Mordenite tuff from Shirasawa, Miyagi-cho, Miyagi Pref., Japan was used as a starting material, from which Na-, K-, Ca-, NH<SUB>4</SUB>-and Hmordenite were prepared by cation exchange treatment.<BR>It was recognized that Na in the mordenite tuff was easily exchanged by other cations, however K was not exchanged easily, at the mild condition. The cation ratios of Na, K, Ca and NH<SUB>4</SUB> for Na-, K-, Ca-and NH<SUB>4</SUB>-mordenite were 78, 94, 49 and 63 mole%, respectively.<BR>The X-ray diffraction peak intensities of mordenite were affected by cation exchange and consequently the slight differences among the X-ray diffraction patterns for different cation exchanged mordenite were observed. The intensities of the main peak, mordenite (202) plane, relative to that (=100) of the original tuff, were 101, 78, 84, 106 and 105 for Na-, K-, Ca-, NH<SUB>4</SUB>-and H-mordenite respectively.<BR>The following sequence of thermal stability was found by DTA method in the cation exchanged mordenite: NH<SUB>4</SUB>->H->K->Na> original tuff>Ca-mordenite.<BR>Separations of hydrogen (or helum), argon, oxygen, nitrogen, krypton, methane and carbon monoxide were investigated using cation exchanged mordenite as column packings. Hydrogen (and/or helium), oxygen (and/or argon), nitrogen, krypton, methane and carbon monoxide were completely separated on the original tuff and Na-mordenite columns, but nitrogen, krypton and methane were eluted with overlap on the Ca-mordenite column. Methane and carbon monoxide were overlapped on the both NH<SUB>4</SUB>-and K-mordenite columns. The values of the separation factor for nitrogen over oxygen, α, on NH<SUB>4</SUB>-, H-and K-mordenite were 1.6, 1.8 and 2. 1, and were much smaller than those on original tuff (α=4.5), Na-(α=4.8) and Ca-mordenite (α=4.2) activated at 350°C.
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