1 Effect of the confinement and the presence of cations on the hydrogen bonding of water in LTA-type zeolite S. Calero and P. Gómez-Álvarez* Department of Physical, Chemical and Natural Systems. University Pablo Olavide. Ctra. Utrera km. 1, 41013, Seville, Spain *E-mail: pgomalv1@upo.es