Zeolites 5A were obtained by ion exchange of a zeolite 4A, previously synthesized the hydrothermal method from precursor kaolin, with aim removal As(V) drinking water and Pb(II) irrigation surface water. Zeolite was characterized before after adsorption X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, photoelectron spectroscopy. To find mechanisms both As Pb in r...

−− The main objective of this work is to study the feasibility of new materials to be used as support for boron-nickel catalysts. Potential support materials such as: silica gel, alumina, hydrothermal modified Perlites and zeolite 4A, were characterized by BET, TPR and DRX. After the addition of Ni and B, their catalytic activity evaluated with the nitrobenzene hydrogenation model reaction. The...

The experimentally investigation for dehydration of gas streams in a fixed-bed adsorption column using 4A molecular sieve was reported the first time. Different operating conditions system were performed, such as flow rate (2.0, 5.0 and 8.0 L min.-1) bed depths (10, 20 30 cm). A significantly decreased (p ≤ 0.05) exhaustion time verified result increase rate. On other hand, rupture mass transfe...