Synthesis of Amorphous Titanium Isophthalic Acid Catalyst with Hierarchical Porosity for Efficient Oxidative Desulfurization of Model Feed with Minimum Oxidant
SEPARATION AND PURIFICATION TECHNOLOGY（2025）
Xian Univ Architecture & Technol
Abstract
Deep desulfurization is an indispensable technique for obtaining clean fuel and the preparation of novel materials for upgrading desulfurization efficiency is highly pursued. Herein, we develop a novel amorphous titanium isophthalic acid (Ti-IPA) catalyst with hierarchical porosity and highly dispersion of Ti-OH defect sites via solvothermal method. Ti-IPA is suitable for a variety of oxidant desulfurization (ODS) reaction systems due to its amphiphilic nature. The optimal Ti-IPA reveal extraordinary ODS performance for oxidizing 1000 ppm sulfur of dibenzothiophene-to-dibenzothiophene sulfone in model feed within 12 min at 40 degrees C with minimum oxidant/sulfur molar ratio of 2 (the sulfur oxidation efficiency reached 99.5 %), and the reaction time can be altered to 5 min at 50 degrees C. The activity per unit mass of Ti-IPA reaches 52.2 mmol h(-1)g(-1) at 50 degrees C, outperforming all the reported Ti-based organic materials. Quenching and EPR tests indicate that Ti-IPA adopts non-free-radical ODS mechanism. Experimental and characterization results verify that the terminal OH capped on the Ti defect sites can easily react with oxidant to form peroxo-titanium intermediates, which manipulate the sulfur oxidation efficiency.
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Key words
Clean fuel,Metal-organic frameworks,Hierarchical porosity,Amphiphilic nature,Oxidative desulfurization
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