Framework-incorporated Mn and Co analcime zeolites: Synthesis and characterization

The framework-substituted cobalt and manganese analcime zeolites were synthesized via a direct hydrothermal approach. The obtained samples were characterized by XRD powder, SEM-EDX, nitrogen physical adsorption, Raman microscopy, diffuse reflectance UV–Vis and IR spectroscopy which complementarily demonstrated the incorporation of cobalt and manganese into the zeolites framework. The results showed that substitution of Mn and Co could be placed in two synthesis gels with same compositions containing Al/Mn=5 and Al/Co=4mol ratios, respectively. In addition, with replacing Al with Mn and synthesis of Mn-modified analcime, zeolite with higher surface area and pore volume could be achieved than the Co modified analcime. The images and adsorption–desorption isotherms of N2 at 77K for (a) Co (b) Mn modified analcime. [Display omitted] ► Synthesis of Co and Mn modified analcime for the first time. ► Framework-incorporation of Co and Mn using the same silicate gel composition. ► Applying several techniques to provide proofs for the characterization.