Isomorphous Substitution of Zn2+ in aluminosilicate framework creates two types of mesopores without templates

Abstract

:Mesoporous materials have significant applications in catalysis, adsorption and separation techniques. The material containing pore size between 2 to 50 nm is called as mesoporsous material. The studies on catalysis by solid acids are vast. Aluminosilicates are well known solid acid catalysts. Isomorphous substitution into the framework may enhance the physico-chemical properties of the material. In the present work, the zinc metal ion is introduced into the tetrahedral aluminosilicate framework increases its bronsted acid sites and also creates two types of mesopores. The material activity is maximum at 370 o C. The adsorption application of organic dyes has been carried out to test the activity of the material. The material is effectively adsorbs the congo red and methylene blue dyes from aqueous solution.

A Green Route for Sustainable Nanoporous Solid Acid Catalyst Synthesis Using Bio Template and Analysis of Its Progressive Transformation of CO2

“…The material shows the fundamental vibrations of symmetric stretching and bending vibrations at 790, 430 cm -1 respectively. The distinctive peak at 1086 cm -1 proves the formation of tetrahedral frame work [26][27][28][29] . This spectrum confirms that the tetrahedral frame work is stable after calcination at higher temperature.…”

“…From thermogravimetry (Figure 4), the weight change is observed from 50 o C to 950 o C. The first weight loss observed from 100 o C to 220 o C, it is due to the elimination of reactive and non-reactive water molecules from the outer layer and pores of the catalyst evidenced by endothermic peaks of DTA curves [27][28] . The second weight loss arises at 500 o C due to entire elimination of bio-template from the cavities with evidence of exothermic peak [30][31] .…”