NH3-SCR over Fe/SSZ-13 catalyst prepared by modification of natural chabazite

Natural zeolites are typically found in abundance in various geological formations, including volcanic and sedimentary rocks. The properties of these natural chabazites such as crystallinity, surface area, and composition can be tailored to enhance their catalytic properties. In this work, the low-crystalline natural chabazite containing iron was transformed into a highly crystalline Fe/SSZ-13 catalyst by hydrothermal synthesis. The initial and modified samples were subjected to various characterization techniques, including XRD, N2-physisorption, ICP-OES, and SEM, to measure their crystallinity, porosity, elemental composition and morphology. The characterization results reveal that the modification of natural chabazite enhanced the crystallinity and surface area of the sample, resulting in the incorporation of iron within the micropores of SSZ-13 zeolite. Their catalytic activities were evaluated at varying temperatures, and the resulting Fe/SSZ-13 catalyst showed high activity in the NH3-SCR reaction.