XPS study of nitrided molybdena/titania catalyst for the hydrodesulfurization of dibenzothiophene
Journal Article
·
· Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical
The relationship between the molybdenum species of nitrided Mo/TiO{sub 2} catalysts and the HDS activity of the catalysts was studied by XPS and X-ray diffraction. The HDS of dibenzothiophene was carried out in a fixed-bed microreactor at 573 K and 10.1 MPa of total pressure. The 10.3% MoO{sub 3}/TiO{sub 2}catalyst was nitrided by a temperature-programmed reaction with ammonia at 4 L h{sup {minus}1} at various temperatures. The 1,023 K nitrided catalyst held the highest TOF (based on CO adsorption). From XPS analysis, it was found that the 1023 K nitrided molybdenum catalyst was significantly difficult to sulfide the surface molybdenum species of the nitrided catalyst. The 773 K nitrided catalyst had more sulfur accumulation and less nitrogen release than the 1,023 K nitrided catalyst. For the Mo/TiO{sub 2} nitrided above 973 K, titania was reduced and nitrided to form TiO and TiN but was not transformed to rutile. The molybdenum oxidation states of the nitrided Mo/TiO{sub 2} catalysts decreased with increasing nitriding temperature, and Mo{sup 2+} and Mo{sup 0} ions were the most active for the HDS of dibenzothiophene.
- Research Organization:
- Tokyo Univ. of Agriculture and Technology, Koganei (JP)
- OSTI ID:
- 20013100
- Journal Information:
- Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical, Journal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical Journal Issue: 46 Vol. 103; ISSN 1089-5647; ISSN JPCBFK
- Country of Publication:
- United States
- Language:
- English
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