Generación de mesoporosidad en zeolitas ZSM-11, BETA e Y por tratamiento alcalino

The process used consisted of treating samples with an aqueous solution of NaOH at 65 ° C for 30 minutes. An exchange with NH4Cl, to recover the acidity, followed by desorption in a N2 stream and subsequent calcination at 500 ° C was then performed.

The treated samples were evaluated by various techniques such as XRD, ICP, SEM, and surface area determination by BET method, specific external area, mesopore volume and distribution of pore size by the BJH method. This treatment resulted in a mesoporous zeolitic materials phase hexagonal arrangement and defined pore size, coexisting with the remaining crystalline phase. The generation of mesopores would cause a decrease in the Si / Al ratio, accompanied by an increase of the surface area with respect to the starting material.