Crystal structure of REY series zeolite
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The crystal structure of REY series zeolite can be divided into three components: (1) aluminosilicate framework, (2) pores and voids containing exchangeable cations M in the framework, (3) latent phase water molecules, namely zeolite water .
The structure of REY series zeolite is somewhat different from the skeleton of quartz and feldspar. The framework structure of quartz and feldspar is relatively tight, with a specific gravity of 2.6~2.7, while the framework structure of zeolite is relatively sparse, with a specific gravity of 2.0~2.2. The cavity after dehydration can be as large as 47%, such as chabazite, or even 50%, such as synthetic zeolite.
In the feldspar structure, metal cations are confined in the interstices of the crystal framework composed of O ions, and it is difficult for these metal cations to move freely unless the crystal is destroyed. The exchange of Na or K by Ca must be carried out at the same time as the replacement of Si and Al, that is, paired replacement, which will inevitably lead to the change of the Si/AI ratio.
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