Ceramic material from zeolite rock: structure and properties

Valdés, José E.; Rodriguez, A. Victorero

doi:10.1007/bf00728904

Cited by 3 publications

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“…Very interesting work concerning the study of the thermal transformation of alkaline-earth or alkaline cation exchanged zeolites into ceramics is described in the literature. ,− However, systematic investigations with the aim of determining the optimal conditions of synthesis of various ceramics of technological interest starting from cation exchanged zeolites are very scarce.…”

Section: Introductionmentioning

confidence: 99%

New Insight into the Thermal Transformation of Barium-Exchanged Zeolite A to Celsian

et al. 2002

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The thermal transformation of a sample of Ba-exchanged zeolite A, containing a residual Na content of 0.20 meq/g, into monoclinic celsian is thoroughly investigated. The samples were thermally treated at temperatures ranging from 200 to 1500 °C for times up to 40 h and subsequently were characterized by room-temperature X-ray diffraction. The following are the main results of this investigation:(1) Above 500 °C, the presence of small crystalline aggregates of monoclinic celsian dispersed in the amorphous phase arising from the thermal collapse of Ba-exchanged zeolite A is recorded.(2) Above 900 °C, crystallization of hexacelsian occurs.(3) Above 1100 °C, hexacelsian converts into monoclinic celsian. The conversion is complete with thermal treatments at 1300, 1400, and 1500 °C within 22, 15, and 22 h, respectively.The presence of monoclinic celsian nuclei above 500 °C appears to favor the conversion of hexacelsian into monoclinic celsian at temperatures higher than 1100 °C. The residual Na content of Ba-exchanged zeolite A was found to strongly affect the temperatures and times at which the transformations of amorphous phase → hexacelsian and hexacelsian → monoclinic celsian occur. Actually a higher Na residual content results in lower temperatures and times, ceteris paribus.

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