Unusual high-pressure intrusion-extrusion behavior of electrolyte solutions in Mu-26, a pure silica zeolite of topology STF

Abstract High pressure intrusion-extrusion of LiCl aqueous solutions in Mu-26 zeolite (STF-type zeosil) has been studied. “Mu-26 – LiCl aqueous solution” systems have demonstrated an unusual combination of bumper and shock absorber behavior with several features and a high absorbed energy of 40.2 J/g. Contrary to other zeosils, the increase of LiCl concentration does not lead to an increase of intrusion reversibility. This phenomenon could be explained by the creation of higher amount of silanol defects inside the pores under LiCl aqueous solution infiltration. A highest rise of intrusion pressure (∼6.6 times) with LiCl concentration among all the zeosils with similar pore diameter is observed. The pressure increase is accompanied with a strong rise of the intruded volume.