Surface structure and thiophene hydrodesulfurization activity of Mo/TiO sub 2 catalysts

Journal Article · Thu Jul 27 04:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100352a046· OSTI ID:7172060

Quincy, R B; Houalla, M; Proctor, A; Hercules, D M ^[1]

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1. Univ. of Pittsburgh, PA (USA)

Thiophene hydrodesulfurization (HDS) activity was measured for a series of Mo/TiO{sub 2} catalysts having Mo loadings of 0.5-13.5 wt% MoO{sub 3}. Raman data and thiophene HDS activity measurements suggest that three molybdenum species are present on oxidic Mo/TiO{sub 2} catalysts. A surface Mo interaction species is formed up to Mo loadings of 2.5 wt% MoO{sub 3} and is the oxidic precursor to the most active species for thiophene HDS (intrinsic thiophene HDS activity of 816 cm{sup 3} of C{sub 4} product/(h g of MoO{sub 3})). For higher Mo loadings, a second surface Mo interaction species is formed, which contributes to the background on the low-frequency side of the broad 950-960-cm{sup {minus}1} Raman peak and is less active for thiophene HDS (intrinsic activity of 250 cm{sup 3} of C{sub 4} product/(h g of MoO{sub 3})). X-ray photoelectron spectroscopic data show that both Mo surface species have similar dispersions. Catalysts with Mo loadings of > 8-9 wt % MoO{sub 3} also contain bulk MoO{sub 3}. The distribution of the three Mo species for the oxidic Mo/TiO{sub 2} catalysts is derived from Raman and HDS measurements.

• OSTI ID: 7172060
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:15; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360000* -- Materials
360100 -- Metals & Alloys
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400000 -- Chemistry
400202 -- Isotope Effects
Isotope Exchange
& Isotope Separation
CATALYSTS
CHALCOGENIDES
DATA
DATA ANALYSIS
ELEMENTS
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
REFRACTORY METAL COMPOUNDS
SULFUR
THIOPHENE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS