Preparation of Basic Nanocatalyst using Nanocrystaline NaY Zeolite

Due to some drawback and limitations regarding homogenous catalyst application including very difficult separation from reaction mixture, product contamination and multiple washing steps, many researches are conducted towards using heterogeneous catalysts in chemical reactions. The main challenges in field of hetergenous catalysts are mass transfer limitations, active site leaching, catalyst poisoning by environmental factors like oxygen and moisture which limits their application. Fixing heterogeneous catalysts on supports such as zeolite, alumina, mesoporous silicates, polymeric compounds e.g PVA, is considered as a solution to overcome limited active sites. In present study nanocrystaline NaY nanozeolite as well as MgO nanoparticles were synthesized with modified procedure in good yield and high reproducibility. According to XRD and SEM/EDX characterizations, nanocrystaline zeolite has the formula of Na2.06 Al2 Si3.8 O11.63 - 8H2O and cubic morphology and nano MgO has layered morphology.Two different methods for the preparation of basic nanocatalyst (MgO / Nano NaY zeolite) including solventless microwave assisted reaction and wet impregnation using three different Mg Precursor were performed. Amongst different methods, wet impregnation needs large amounts of concentrated metal salt solution and suitable loading is not produced. So solventless microwave assisted is preferred method.

کلیدواژه ها:

Heterogeneous catalysts ، nanocrystaline NaY zeolite ، basic catalysts ، impregnation ، solventless microwave assisted ،