FT-IR and solid-state NMR investigation of phosphorus promoted hydrotreating catalyst precursors

Journal Article · Sat Nov 30 23:00:00 EST 1991 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1016/0021-9517(91)90166-2· OSTI ID:7202821

DeCanio, E C; Edwards, J C; Scalzo, T R

The effect of phosphorus on the structure of Ni-Mo/Al{sub 2}O{sub 3} hydrotreating catalyst precursors has been investigated. Calcined and reduced P/Al{sub 2}O{sub 3}, P-Ni/Al{sub 2}O{sub 3}, P-Mo/Al{sub 2}O{sub 3}, and P-Ni-Mo/Al{sub 2}O{sub 3} (where the wt% P = 0.0 to 10.0 wt % Mo = 8.0 to 12.0, and wt% Ni = 4.0) have been studied using FT-IR, XRD, and {sup 27}Al MAS NMR techniques. Phosphoric acid reacts with alumina hydroxyls forming monomeric and polymeric phosphates. At the higher phosphorus loadings, aluminum phosphate is also formed. On calcined P-Ni/Al{sub 2}O{sub 3}, nickel phosphate is formed. This leads to a decrease in density of Ni{sub 0} sites in the reduced state as measured by CO adsorption. The addition of up to 1.5 wt% P to Mo(8)/Al{sub 2}O{sub 3} promotes the formation of octahedral molybdena on the alumina surface. However, the addition of > 2.0 wt% P results in the formation of bulk MoO{sub 3} and Al{sub 2}(MoO{sub 4}){sub 3} in both P-Mo(8)/Al{sub 2}O{sub 3} and P-Mo(12)/Al{sub 2}O{sub 3}. CO adsorption on reduced P-Ni(4)-Mo(8)/Al{sub 2}O{sub 3} samples shows that the presence of 0.5 wt% P causes a significant increase in the number of sites adsorbing CO. Increasing the P loading further causes a decrease in the number of adsorbing sites; this decrease can be attributed to the formation of either nickel phosphate or nickel molybdate.

• OSTI ID: 7202821
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 132:2; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ADSORPTION
ALUMINIUM 27
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
ALUMINIUM OXIDES
ALUMINIUM PHOSPHATES
CALCINATION
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CORRELATIONS
CRACKING
DECOMPOSITION
DIFFRACTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
HYDROCRACKING
HYDROGEN COMPOUNDS
HYDROXYL RADICALS
INFRARED RADIATION
INORGANIC ACIDS
INTEGRAL TRANSFORMATIONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
METALS
MOLYBDATES
MOLYBDENUM
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NICKEL
NICKEL COMPOUNDS
NICKEL PHOSPHATES
NONMETALS
NUCLEAR MAGNETIC RESONANCE
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PETROLEUM
PHASE STUDIES
PHOSPHATES
PHOSPHORIC ACID
PHOSPHORUS
PHOSPHORUS COMPOUNDS
PROMOTERS
PYROLYSIS
RADIATIONS
RADICALS
REDUCTION
REFRACTORY METAL COMPOUNDS
RESONANCE
SCATTERING
SORPTION
SPECTROSCOPY
STABLE ISOTOPES
SURFACE PROPERTIES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VISCOSITY
X-RAY DIFFRACTION