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

Table 7

Reusability study of catalysts used in esterification reaction at 70°C, 48 h, catalyst weight percent = 11%, and methanol to oleic acid molar ratio = 10 : 1.

Catalyst	Yield (%)
	48 h (without reusability)	48 h (reusability first run)	48 h (reusability second run)
Zr-H-ZSM-22	48.07	46.7	45.2
Fe-H-ZSM-22	47.17	45.28	43
Sr-H-ZSM-22	29.55	27	25.73
Zr-H-ZSM-22@SiO2	44.24	43.68	41.89
Fe-H-ZSM-22@SiO2	35.88	32.12	30.04
Sr-H-ZSM-22@SiO2	35.56	33.15	31.8