Infrared Study on the Adsorption Behavior of Methylamine in a Series of Large Pore Cationic Zeolites: A Further Confirmation of Three Types of Interaction between Methylamine and Zeolites

The interaction of methylamine with a large series of 12R window cationic zeolites having different compensating ions and structures was discussed. The adsorption of methylamine was performed on self-supported zeolite wafer. The location of cations and zeolite structure modifies the strength of each kind of interaction and the overall interaction strength.</p

Average local electrostatic potential and the core-valency separation in atoms

The average local electrostatic potential function, V(r)/ρ(r), is calculated for 87 atoms, Li-Ac, in the ground state using the nonrelativistic average-over-configuration numerical Hartree-Fock density. It is found empirically that in a given atom the shell boundaries are expressed as the successively increasing maxima in V(r)/ρ(r) and the outermost maximum presents good approximate estimates of the core-valence separation in atoms. The likeness in behavior of V(r)/ρ(r) at each shell boundary with the maximum hardness principle is discussed. The single-exponent-fit parameters for the electron density in the valency region are provided for all atoms