Highly efficient deep desulfurization of fuels by meso/macroporous H3PW12O40/TiO2 at room temperature

Journal Article · Sat Sep 15 00:00:00 EDT 2018 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2018.04.048· OSTI ID:22805181

Yue, Du ^[1]; Jiaheng, Lei ^[2]; Lina, Zhou ^[1]; Ran, Guo Zhen; Xiaodi, Du; Junsheng, Li ^[2]

---

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei, 430070 (China)
2. Department of Chemistry, Wuhan University of Technology, Wuhan, Hubei, 430070 (China)

Highlights: • A new kind of meso/macroporous structured HPW/TiO{sub 2} catalyst was prepared by monodispersed polystyrene spheres and quaternary ammonium bromide. • Quaternary ammonium bromide with longer alkyl chains length (STAB) was found to be the best mesostructure-directing agent in the synthesis of meso/macroporous HPW/TiO{sub 2} catalyst. • The influence of dosage of macroporous templates (monodispersed polystyrene spheres) and alkyl chains length of quaternary ammonium bromide on the textural of meso/macroporous HPW/TiO{sub 2} catalyst were investigated. • With proper PS spheres and quaternary ammonium bromide usage, disordered macropores arranged periodicity and led relatively larger pore size and pore volume. • The meso/macroporous HPW/TiO{sub 2} materials exhibited enhanced excellent desulfurization performance of thiophenic sulfur in model fuel than other samples. Dibenzothiophene can be completely removed within 2 h at 30 °C. - Abstract: This paper described the synthesis of meso/macroporous phosphotungstic acid (HPW) /TiO{sub 2} catalyst with quaternary ammonium bromide and monodispersed polystyrene spheres (PS) as dual-template. The synthetic parameters, such as concentration of the templates and the alky chain length of quaternary ammonium bromide was studied carefully and optimized to generate catalyst with regulated porous features. The chemical properties of the catalyst was also investigated, X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) measurements confirmed the Keggin-type HPW were highly dispersed on the TiO{sub 2} framework. The optimal meso/macroporous HPW/TiO{sub 2} catalyst exhibited excellent catalytic activity in the oxidation of refractory sulphur compounds such as benzothiophene (BT), dibenzothiophene (DBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT). DBT was removed within 2 h at 30 °C under selected reaction conditions and the apparent activation energy for DBT oxidation was calculated to be 45.7 kJ/mol. The high ODS reaction rate of catalyst could be attributed to the combination of unique meso/macroporous architecture allowing for efficient mass transport of reactants and products in pore channel and its high surface area, large mesoporous size, and pore volume enabling sufficient exposure of catalytic active sites. Moreover, the meso/macroporous HPW/TiO{sub 2} catalyst also exhibited excellent reusability with no obviously degradation even after eight cycles.

• OSTI ID: 22805181
• Journal Information: Materials Research Bulletin, Vol. 105; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ACTIVATION ENERGY
AMMONIUM COMPOUNDS
BROMIDES
CATALYSTS
CHEMICAL PROPERTIES
CONCENTRATION RATIO
DESULFURIZATION
FOURIER TRANSFORM SPECTROMETERS
MASS TRANSFER
NANOSTRUCTURES
OXIDATION
POLYSTYRENE
POROUS MATERIALS
REACTION KINETICS
REFRACTORIES
SPHERES
SULFUR
SULFUR COMPOUNDS
SURFACE AREA
SYNTHESIS
TEMPERATURE RANGE 0273-0400 K
THIONAPHTHENES
TITANIUM OXIDES
TUNGSTOPHOSPHORIC ACID
X-RAY DIFFRACTION