| 저자(한글) |
Bazyari, A.,Khodadadi, A.A.,Haghighat Mamaghani, A.,Beheshtian, J.,Thompson, L.T.,Mortazavi, Y. |
| 저자(영문) |
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| 소속기관 |
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| 소속기관(영문) |
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| 출판인 |
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| 간행물 번호 |
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| 발행연도 |
2016-01-01 |
| 초록 |
High-performance microporous titania-silica (TiO 2 -SiO 2 ) nanocomposites with different TiO 2 loadings of 0-100wt% were synthesized using a sol-gel method and evaluated for ultra-deep oxidative desulfurization (ODS) of dibenzothiophene (DBT) using tert-butyl hydroperoxide (TBHP) as oxidant. The prepared catalysts were characterized by the N 2 adsorption-desorption, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), high resolution transmission electron microscopy (HR-TEM) and ammonia temperature-programmed desorption (NH 3 -TPD), and the ODS performances were evaluated in a batch reactor. The effects of titanium loading, calcination temperature, and reaction temperature on the catalyst performance were examined. The activity varied significantly with the amount of titanium in the TiO 2 -SiO 2 nanocomposite with a nearly constant turnover frequency (TOF) of about 24.6h -1 . The TiO 2 -SiO 2 nanocomposite containing 50wt% titania loading (TS-50) with the highest total acidity was an excellent catalyst capable of removing more than 98% of DBT to less than 10ppmw, after 20min. DBT was oxidized to DBT-sulfone (DBTO 2 ), a species with higher polarity that could be subsequently adsorbed on the TS-50 and therefore, the nanocomposite acts as both a catalyst and adsorbent simultaneously. The catalysts could be easily regenerated by calcination at 873K. An empirical kinetic model was employed to interpret the reaction rate data; the apparent activation energy was 43.8kJ/mol. Density functional theory (DFT) calculations revealed that DBT and TBHP reactants and DBTO 2 product were more strongly adsorbed on (001) surface of beta;-cristobalite silica than on (101) surface of anatase titania. The adsorption energy of DBTO 2 was larger than DBT on both surfaces. |
| 원문URL |
http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=03553784&target=NART&cn=NART73035743 |
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