Adsorption of SF6/N2 Decomposed Gas in NaA, MFI and NaZSM-5 Molecular Sieves

The adsorption behavior of NaA, MFI and NaZSM-5 molecular sieves on SF6/N2 decomposition gases SO2, NF3, SO2F2 and CS2 was studied. The adsorption isotherms and adsorption heat of four gas molecules at different temperatures on three molecular sieves were calculated by software. It is found that the adsorption capacity of NaA molecular sieve for four gases is more than that of MFI and NaZSM-5 molecular sieve. Except for a few cases, the adsorption capacity of NaZSM-5 molecular sieve for four gases is also slightly more than that of MFI molecular sieve. This is related to the presence of Na+ metal cations in NaA and NaZSM-5 molecular sieves. The presence of metal cations increases the active sites in the molecular sieve, which is beneficial to the adsorption of adsorbate on the molecular sieve. Compared with MFI and NaZSM-5 molecular sieves, NaA molecular sieves are more suitable for adsorption of four decomposition products of SF6/N2 mixture. In SF6/N2 electrical equipment containing NaA molecular sieve, if you want to monitor the operation status of insulated electrical equipment through the change of decomposition gas content, you must consider the influence of NaA molecular sieve on the adsorption behavior of decomposition gas.