Effect of carbon-interaction on structure-photoactivity of Cu doped amorphous TiO^sub 2^ catalysts for visible-light-oriented oxidative desulphurization of dibenzothiophene

Amorphous TiO2 (AT) was successfully prepared via the sol-gel technique, using different titanium sources followed by incorporation of copper via the electrochemical method to give CuO/TiO2 (CAT) catalysts. The catalysts were characterized via XRD, N2 physisorption, FTIR, TEM, EDX, XPS, ESR and UV–V...

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Published inFuel (Guildford) Vol. 216; p. 407
Main Authors Hitam, CNC, Jalil, AA, Triwahyono, S, Rahman, AFA, Hassan, NS, Khusnun, NF, Jamian, SF, Mamat, CR, Nabgan, W, Ahmad, A
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier BV 15.03.2018
Subjects
Carbon
Catalysis
Catalysts
Catalytic activity
Chemical synthesis
Copper
Copper oxides
Desulfurization
Dibenzothiophene
Electrochemistry
Fuel oils
Irradiation
Oxidation
Photocatalysis
Physicochemical properties
Precursors
Sol-gel processes
Sulfur
Sulfur removal
Surface defects
Titanium
Titanium catalysts
Titanium dioxide
X ray photoelectron spectroscopy
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Summary:Amorphous TiO2 (AT) was successfully prepared via the sol-gel technique, using different titanium sources followed by incorporation of copper via the electrochemical method to give CuO/TiO2 (CAT) catalysts. The catalysts were characterized via XRD, N2 physisorption, FTIR, TEM, EDX, XPS, ESR and UV–Vis DRS. The results verified that the use of different titanium precursors have profound effect on the physicochemical properties of the AT catalysts. Further one-pot self-doping carbon from titanium precursor during the addition of copper could greatly enhanced the photocatalytic activity of CAT on the oxidative desulphurization of dibenzothiophene (DBT). 15 CATTBOT exhibited the best performance mainly due to the narrowest band gap and higher numbers of O–Ti–C and Ti–O–C bonds, as well as appropriate amount of Ti3+ surface defects (TSD). These abovementioned properties offered good mobility of electron-hole pairs and/or trap the electrons for enhancement of photoactivity under irradiation of visible light. Kinetic studies showed that the photocatalytic oxidative desulphurization of DBT followed the pseudo-first order Langmuir-Hinshelwood model, where the adsorption was the controlling step. It is believed that these results could contribute to the synthesis of various supported catalysts for numerous applications specifically in removal of sulphur containing compounds in fuel oils.
ISSN:0016-2361
1873-7153