Issue 0, 1970

Hydrothermal chemistry of silicates. Part XV. Synthesis and nature of some salt-bearing aluminosilicates

Abstract

It was earlier shown to be possible to synthesise novel salt-bearing aluminosilicates termed P, Q, N, and O, and to obtain molecular sieve sorbents from one of these. These aluminosilicates have now been characterised by extending the conditions of synthesis and by crystallographic and chemical investigations. Syntheses, especially of P and Q, can be effected not only from gels but also from a range of crystalline aluminosilicates. The species containing BaCl2 and BaBr2(respectively species P and Q) are based upon the same aluminosilicate framework as the synthetic zeolite ZK-5 while those containing KCl and KBr (respectively species N and O) are based upon the framework of the synthetic zeolite K–F reported in 1956. P and Q differ from ZK-5 notably in the salt content and exchange ions. In addition the variants P′ and Q′ were synthesised, which represent aluminous modifications of the ZK-5 framework, as well as an iodide-bearing form of zeolite K–F. Both K–F and ZK-5 frameworks were greatly heat-stabilised by the intracrystalline salts.

The removal of barium halides, by extraction with distilled water and various electrolyte solutions, has been investigated for P, Q, P′, and Q′. Solutions of NaNO3 or LiNO3 are much more effective than distilled water. The influence of electrolyte type and concentration, of temperature, of the proportion of crystals to electrolyte solution of fixed concentration, and of time, upon the removal of barium halides have been particularly studied, to optimise the preparation of molecular sieve zeolites.

Article information

Article type
Paper

J. Chem. Soc. A, 1970, 2735-2745

Hydrothermal chemistry of silicates. Part XV. Synthesis and nature of some salt-bearing aluminosilicates

R. M. Barrer and C. Marcilly, J. Chem. Soc. A, 1970, 2735 DOI: 10.1039/J19700002735

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements