Synthesis of Organic-Inorganic Hybrid Nanocomposite Polyoxometalate/Metal Oxide/CS Polymer (PMnW11@TiO2@CS): Nanocatalyst for Oxidative Desulfurization of Real Fuel

摘要

abstract_textpA new type of organic-inorganic hybrid nanocatalyst was synthesized by composition of Mn(II)-substituted Keggin-type polyoxometalate (PMnW11), titanium dioxide (TiO2) and chitosan polymer (CS) via sol-gel method. The synthesized nanocomposite (PMnW11@TiO2@CS) was characterized by fouriour transform infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), energy dispersive X-ray analysis (EDAX) and scanning electron microscopy (SEM) techniques. PMnW11@TiO2@CS was used as a new hybrid nanocatalyst for catalytic oxidative desulfurization (CODS) of real and model fuel in the presence of CH3COOH/H2O2 in the volume ratio of 1/2 as oxidant system at 35 degrees C after 60 min. On the basis of the suggested CODS system, mercaptan and sulfur content of real fuel could be removed lowered with 97. The CODS of dibenzothiophene molecules, which are difficult to remove, could be reached to 98. The main factors affecting on the CODS efficiency were investigated in detail. The PMnW11@TiO2@CS was demonstrated an excellent recyclability performance in the CODS reactions for five times without noticeable decrease in catalytic activity./p/abstract_text