The nature and stability of the barium-exchanged form of type-A zeolite was investigated and theories were proposed for the apparently anomalous behaviour exhibited by this particular exchanged form. Parameters for the self-diffusion of barium ions were obtained (table 5) and comparisons were made with values for other alkaline earth cations, both in type-A zeolite and in chabazite.
Stability and Cation Self-Diffusion in Barium Type A Zeolite. A.Dyer, R.B.Gettins, A.Molyneux: Journal of Inorganic and Nuclear Chemistry, 1968, 30[10], 2823–9
Table 6
Self-Diffusion of Alcohols in Zeolites at 298K
Diffusant | Zeolite | D(m2/s) |
ethanol | MgNaA | 1.28 x 10-18 |
ethanol | CaNaA | 2.40 x 10-18 |
ethanol | SrNaA | 8.40 x 10-19 |
ethanol | ZnNaA | 7.90 x 10-19 |
ethanol | LiNaA | 6.10 x 10-19 |
ethanol | KNaA | 2.60 x 10-19 |
ethanol | HNaA | 1.69 x 10-18 |
ethanol | NaA | 1.31 x 10-18 |
butanol | MgNaA | 4.91 x 10-19 |
butanol | CaNaA | 9.10 x 10-20 |
butanol | SrNaA | 1.33 x 10-19 |
butanol | ZnNaA | 5.80 x 10-20 |
butanol | LiNaA | 3.74 x 10-19 |
butanol | KNaA | 2.18 x 10-19 |
butanol | HNaA | 9.40 x 10-20 |
butanol | NaA | 9.60 x 10-20 |