Mono Mn(II)-substituted phosphotungstate@modified graphene oxide as a high-performance nanocatalyst for oxidative demercaptanization of gasoline

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) Vol. 52; pp. 42 - 50
• Main Authors: Rezvani, Mohammad Ali, Shokri Aghbolagh, Zahra, Hosseini Monfared, Hassan, Khandan, Sahar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 25-08-2017; 한국공업화학회
• Subjects: Gasoline; Graphene oxide; Heterogeneous catalyst; Keggin-type polyoxometalate; Oxidative demercaptanization; 화학공학; Heterogeneous catalyst; Graphene oxide; Keggin-type polyoxometalate; Oxidative demercaptanization; Gasoline
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2017.03.021

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•The catalyst PMnW11@mGO was synthesized via sol–gel method.•The catalytic activity of nanocomposite was tested on the ODS of gasoline.•PMnW11@mGO was shown be able to remove S-compounds of gasoline.•The nanocatalyst could be separated and recycled easily after five runs.
In this study, the removal of hazardous sulfur compounds from gasoline was provided based on catalytic oxidation demercaptanization technique. The cesium salt of mono Mn(II)-substituted Keggin-type polyoxometalate Cs5PMnW11O39 (PMnW11) was successfully synthesized and immobilized on modified graphene oxide (mGO) as a new nanocatalyst (PMnW11@mGO) for demercaptanization process. The synthesized materials were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet–visible (UV–vis), Fourier transform infrared spectroscopy (FT-IR), and cyclic voltammetry (CV) analysis. Characterization of the prepared nanocomposite was confirmed that the structures of the PMnW11 and mGO were retained after immobilization. The sulfur-containing molecules in real gasoline and simulated fuel were oxidized and extracted efficiently under mild reaction condition. After treatment, the mercaptans and total sulfur content of real gasoline were lowered with 98.8% and 98% yield, respectively. The PMnW11@mGO hybrid nanocatalyst was separated and reused conveniently at the end of the reaction for five times. The excellent performance of this new catalytic oxidation system can be a promising rout to achieve ultra-clean gasoline.