Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

XRD, TPDA, and IR spectroscopy of pyridine were used to study the effect of the synthesis conditions on the formation, adsorption characteristics, and acid properties of composite micro/mesoporous materials. Spatially well-ordered phases such as MCM-41 and zeolite phases ZSM-5, Beta, and MCM-22 were found to exist in our samples. Variation of the preparation conditions permitted us to regulate the porosity and adsorption characteristics of the composite materials and the type, concentration, and strength distribution of the acid sites in the samples. The strength of the acid sites of the composite micro/mesoporous materials and their concentration are much higher than for mesoporous AlSi-MCM-41 but somewhat less than in the initial zeolites. Analysis of the results suggested that the samples obtained under similar conditions are not ordinary mechanical mixtures of two phases (zeolite and AlSi-MCM-41), but rather unique composites with tightly bound nanoparticles due to formation in a single reaction medium.