Research Article

Silica Coating of Metal-Loaded H-ZSM-22 to Form the Core-Shell Nanostructures: Characterization, Textural Properties, and Catalytic Potency in the Esterification of Oleic Acid

Figure 2

Infrared spectra of core-shell catalysts: (a) ZSM-22, (b) H-ZSM-22, (c) Fe-H-ZSM-22, (d) Zr-H-ZSM-22, (e) Sr-H-ZSM-22, (f) Fe-H-ZSM-22@SiO2, (g) Zr-H-ZSM-22@SiO2, and (h) Sr-H-ZSM-22@SiO2.