Experimental study of natrolite and scolecite saturation with ammonium, methane, and propane |
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| Authors: | T A Bul’bak S V Shvedenkova and A Yu Likhacheva |
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| Abstract: | The incorporation of the molecular species of C-H-N fluid (ammonium, methane, and propane) into the structural cavities of
natrolite and scolecite was experimentally studied at t = 200°C, P = 20 MPa, and an experiment duration of 192 h. The zeolites were modified without ion exchange by the exposure of a preliminarily
dehydrated mineral to the appropriate gas. The presence of ammonium and light hydrocarbons in the crystal matrix of zeolites
was confirmed by IR and Raman spectroscopy and gas chromatography. The data of differential thermogravimetry revealed differences
in the behavior of CH4- and NH3-zeolites during heating. The X-ray diffraction patterns and IR and Raman spectra of zeolites in the region of framework vibration
indicate deformations in the matrix structure after the experiments. The interaction of dehydrated scolecite with “dry” propane
resulted in amorphization under the experimental parameters. The maximum methane contents in the freshly synthesized zeolites
determined by gas chromatography are 4.12 wt % for CH4-scolecite and 8.96 wt % for CH4-natrolite. The synthetic C3H8-natrolite contains 4.45 wt % C3H8. In the zeolites saturated with respect to dry ammonium, the highest NH3 contents were observed in the 0.4–0.25 mm scolecite fraction (12.86 wt %), 0.25–0.05 mm scolecite fraction (11.43 wt %),
and NH3-natrolite (9.28 wt %). |
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