Post-synthetic halogen incorporation in Zr-based MOF for enhancement of the catalytic oxidation reactions

Abstract

BackgroundOne way to convert hydrocarbons to processed products is to use a catalytic oxidation reaction. The oxidation process, unlike hydrogenation, has not grown much in the industry and oxidation of CH bond is important in the production of precursors in the pharmaceutical and agronomical industries. The aim of this work is the study of catalytic properties of alcohol oxidation in the case of post-synthetic modification, as MIP-202 includes large hydrogen-bonding networks that are available to replace chloride with iodide and bromide. MethodThis is the first time that iodide and bromide have been used as active sites on heterogeneous catalysts through post-synthesis modification. These compounds were characterized by X-ray powder diffraction (PXRD), thermal gravimetric analysis (TGA), infrared spectroscopy (FT-IR), N2 gas adsorption-desorption (BET theory), scanning electron microscopes (SEM), and energy dispersive X-ray (EDX) analysis. Significance of findingsUnder ambient temperature, MIP-202-Cl, MIP-202-I, and MIP-202-Br catalyzed the oxidation of alcohols, including benzyl alcohol, with TBHP as the oxidant. Halogens are commonly used in oxidation reactions as oxygen-carrying species, called active catalytic sites. MIP-202-I is introduced as the best catalyst for improving the oxidation of alcohols, and then MIP-202-Br and MIP-202-Cl were introduced as high-efficiency catalysts, respectively.