Modified geopolymers as promising catalyst supports for abatement of dichloromethane

Geopolymers have not been extensively employed as catalytic materials despite of their zeolite-resembling Si–Al structure. Geopolymerization offers a novel way for preparation catalysts and possibility to use waste or industrial side-stream derived raw material resource catalyst manufacturing. This work concentrates on metakaolin-based geopolymer that were prepared, characterized tested alternative environmentally benign supports the oxidation dichloromethane. The geopolymers with Si/Al ratio 1.5 modified HCl increase specific surface area, which is important in applications. Significant areas was achieved via leaching Na Al from Highest calcined over 500 m2g-1. Use acid concentrations higher than 1 M led dehydroxylation geopolymer. Dehydroxylation decreased total acidity through loss Brønsted sites, are responsible adsorption dichloromethane beginning reaction. Absence sites observed by formation CH2O only reaction intermediate. best result found treated HCl. Without using any additional active maximum conversion 90% reached at 525 °C yield 83%. indicates good potential be used environmental