Abstract
The level of Fe impurities in 2 well-crystallized kaolinites was modified (by addition or chemical removal treatment) to analyze the Fe influence in the aluminosilicate zeolite synthesis.
The original and modified clays were heat-treated in order to change their reactivity for zeolite A synthesis, and their thermal transformations were studied by X-ray diffraction (XRD), determination of point of zero charge (PZC) and infrared (IR) techniques. It was established that many structural changes took place, regardless of the Fe clay content. Furthermore, the presence of Fe species in alkaline solution or in the solid phase did not seem to greatly influence the zeolite crystallization, because only small differences in the conversion values among samples with different Fe contents were registered. The crystallization process seemed to be related mainly to AI coordination changes produced by the thermal and Fe removal treatments used.
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References
Ball J, Dwyer J, Garfdorth AA, Smith W. 1986. The synthesis and characterization of iron silicate molecular sieves. Proc 7th Int Zeolite Conf. p 137–139.
Basaldella El, Bonetto RD, Tara JC. 1993. Synthesis of NaY zeolite on preformed kaolinite spheres. Evolution of zeolite content and textural properties with the reaction time. Ind Eng Chem Res 32:751–757.
Basaldella El, Kikot A, Tara JC. 1995. Effect of pellet pore size and synthesis conditions in the in situ synthesis of LSX zeolite. Ind Eng Chem Res. 34:2990–2996.
Basaldella El, Tara JC. 1995. Synthesis of LSX zeolite in the Na/K system. Influence of the Na/K ratio. Zeolites 11:243–248.
Blok I, De Bruyn PI. 1970. The ionic double layer at the Zn/O solution interface I. The exp. PZC. J Colloid Interface Sci 32:518–525.
Breck DW. 1974. Zeolite molecular sieves. New York: J. Wiley. 313 p.
Breck DW. 1964. US Pat. 3 130 007.
Bulens M, Delmon B. 1977. The exothermic reaction of metakaolinite in the presence of mineralizers. Infl. of crystallinity. Clays Clay Miner 25:271–277.
Haden WL, Dzierzanowski EJ. 1972. US Pat 3 391 994 (1968), 3 503 900 (1972) and 3 657 154.
Hamilton E, Coker EW, Sacco A, Dixon AG, Thompson RW. 1993. The effects of the silica source on the crystallization of zeolite NaX. Zeolites 13:645–653.
Hinckley D. 1963. Variability in crystallinity values among the kaolin deposits of the coastal plain of Georgia and S. Carolina. Clays Clay Miner 13:229–232.
Howell PA, Acara NA. 1964. US Pat. 3 119 660.
Imbert FE, Moreno C, Montero A, Fontal B, Lugano J. 1994. Venezuelan natural aluminosilicates as feedstock in the synthesis of zeolite A. Zeolites 14:374–379.
Kuo JF, Yen TE 1988. Some aspects in predicting the PZC of composite oxide system. J Colloid Interface Sci 121:220–225.
Llenado RA. 1983. The use of sodium A zeolite in detergents. Olson D, Bisio A, editors. Proc 6th Int Zeolite Conf. p 940–956.
Madani A, Aznar A, Sanza J, Serratosa JM. 1990. Si and Al NMR study of zeolite formation from alkali-leached kaolinites. Influence of thermal activation. J Phys Chem 94:760–765.
Murat M, Amorkrane A, Bastide JP, Montanaro L. 1992. Synthesis of zeolites from thermally activated kaolinite. Some observations on nucléation and growth. Clay Miner 27:119–130.
Percival HJ, Duncan JF, Foster PK. Interpretation of the kaolinite-mullite reaction sequence from IR. J Am Ceram Soc 57:57-61.
Pyman MA, Bowden JW, Posner AM. 1979. The PZC of amorphous coprecipitation of silica with hydrous Al or ferric hydroxide. Clay Miner 14:87–92.
Smolik T, Harman V, Fuerstenau D. 1966. Surface characterization and flotation behaviour of aluminosilicates. Trans Mining Eng AIME 235:367–370.
Torres Sánchez RM. 1983. Etude de l’association entre la kaolinite et le fer externe [thesis]. Belgium: Univ Cathol. de Louvain-la-Neuve, L-l-N. 89 p.
Torres Sanchez RM, Aglietti EF, Porto Lopez JM. 1988. PZC modification on mechanochemical treated kaolinite. Mater Cem and Physics 20:27–38.
Tschapek M, Tcheichvili L, Wasowski C. 1974. The PZC of kaolinite and SiO2 + Al2O3 mixtures. Clays Clay Miner 10:219–229.
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Basaldella, E.I., Torres Sánchez, R.M. & Tara, J.C. Iron Influence in the Aluminosilicate Zeolites Synthesis. Clays Clay Miner. 46, 481–486 (1998). https://doi.org/10.1346/CCMN.1998.0460501
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DOI: https://doi.org/10.1346/CCMN.1998.0460501