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 6

The yield% of methyl oleate with different catalysts at 70°C, catalyst weight percent = 11%, and methanol to oleic acid molar ratio = 10 : 1.

Catalyst	Yield (%)
	4 h	8 h	16 h	24 h	48 h
Zr-H-ZSM-22	5.51	15.06	21.54	29.04	48.07
Fe-H-ZSM-22	5.7	8.95	21.42	23.09	47.17
Sr-H-ZSM-22	5.18	8.02	18.15	21.54	29.55
Zr-H-ZSM-22@SiO2	21.72	22.34	24.51	26.11	44.24
Fe-H-ZSM-22@SiO2	15.78	17.19	21.13	24.64	35.88
Sr-H-ZSM-22@SiO2	6.43	13.74	19.08	20.14	35.56