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The effect of potassium and calcium on the formation and structure of cancrinite

The effect of potassium and calcium on the formation and structure of cancrinite
The effect of potassium and calcium on the formation and structure of cancrinite
The effect of potassium and calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 degrees C and 220 degrees C has been studied. Under potassium and calcium free conditions the formation of the cancrinite framework (220 degrees C), [Na8(CO3).(H2O)n][AlSiO4]6 - CAN, and a disordered cancrinite/sodalite intergrowth (150 degrees C) is observed in agreement with the literature. Addition of potassium at low concentrations results in the formation of mixed sodium/potassium cancrinites, [Na8-xKx(CO3).(H2O)n][AlSiO4]6 - CAN, while at higher concentrations non-zeolitic KAlSiO4 is the major product. Similarly addition of calcium to the synthesis media results in its incorporation into these framework structures to give [NaxCay(CO3){x+2y-6}/2(H2O)n][AlSiO]6 - CAN as evidenced by decreases in the cell volumes and EDAX analysis. At high concentrations of calcium a new phase, NaCaSiO3OH, forms.
hydrothermal transformations, soil minerals, bayer process, chemistry
289-294
Armstrong, J.A.
578ab464-61b6-4eac-9b1f-6189341ec191
Kenyon, N.A.
3c87d29e-2e7a-4d66-b360-0e052b8017fc
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4
Armstrong, J.A.
578ab464-61b6-4eac-9b1f-6189341ec191
Kenyon, N.A.
3c87d29e-2e7a-4d66-b360-0e052b8017fc
Weller, M.T.
36a60b56-049f-466c-a1d7-39d6b0d85ff4

Armstrong, J.A., Kenyon, N.A. and Weller, M.T. (2004) The effect of potassium and calcium on the formation and structure of cancrinite. Studies in Surface Science and Catalysis, 154 (Part A-C), 289-294.

Record type: Article

Abstract

The effect of potassium and calcium on the hydrothermal syntheses of aluminosilicate frameworks in the presence of carbonate at 150 degrees C and 220 degrees C has been studied. Under potassium and calcium free conditions the formation of the cancrinite framework (220 degrees C), [Na8(CO3).(H2O)n][AlSiO4]6 - CAN, and a disordered cancrinite/sodalite intergrowth (150 degrees C) is observed in agreement with the literature. Addition of potassium at low concentrations results in the formation of mixed sodium/potassium cancrinites, [Na8-xKx(CO3).(H2O)n][AlSiO4]6 - CAN, while at higher concentrations non-zeolitic KAlSiO4 is the major product. Similarly addition of calcium to the synthesis media results in its incorporation into these framework structures to give [NaxCay(CO3){x+2y-6}/2(H2O)n][AlSiO]6 - CAN as evidenced by decreases in the cell volumes and EDAX analysis. At high concentrations of calcium a new phase, NaCaSiO3OH, forms.

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Published date: 2004
Keywords: hydrothermal transformations, soil minerals, bayer process, chemistry

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Local EPrints ID: 20120
URI: http://eprints.soton.ac.uk/id/eprint/20120
PURE UUID: d2b1e350-3494-4ace-8a5b-5e343e1c14e5

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Date deposited: 22 Feb 2006
Last modified: 21 Jun 2021 16:31

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