US EPA

3849535 

Journal Article 

Effect of the nature of sulfur compounds on their reactivity in the oxidative desulfurization of hydrocarbon fuels with oxygen over a modified CuZnAlO catalyst 

Yashnik, SA; Salnikov, AV; Kerzhentsev, MA; Saraev, AA; Kaichev, VV; Khitsova, LM; Ismagilov, ZR; Yamin, J; Koseoglu, OR 

2017 

1 

Kinetics and Catalysis
ISSN: 0023-1584
EISSN: 1608-3210 

58 

1 

58-72 

10.1134/S0023158417010128 

WOS:000396309700009 

The reactivity of thiophene, dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT), which are the representatives of the main classes of sulfur compounds that are the constituents of diesel fractions, was studied in the course of their oxidative desulfurization with oxygen on a CuO/ZnO/Al2O3 catalyst modified with boron and molybdenum additives. At T >= 375A degrees C, the reactivity increased in the order thiophene < DBT < 4,6-DMDBT. The degree of sulfur removal in the form of SO2 from hydrocarbon fuel, which was simulated by a solution of 4,6-DMDBT in toluene, was 80%. Under the assumption of a first order reaction with respect to sulfur compound and oxygen, the apparent activation energies of the test processes were calculated. An attempt was made to reveal the role of the adsorption of sulfur compounds in the overall process of oxidative desulfurization with the use of X-ray diffraction analysis, X-ray photoelectron spectroscopy, and differential thermal and thermogravimetric analysis with the massspectrometric monitoring of gas phase composition. 

thiophene; dibenzothiophene; oxidative desulfurization in a vapor-gas phase; CuZnAl catalyst; modifiers