Vanadium-51 NMR, characterization of V-contaminated aluminas and aluminosilicate gels

Conference · Wed Aug 01 00:00:00 EDT 1990 · American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States)

OSTI ID:7046861

Iyer, P S; Occelli, M L ^[1]; Eckert, H ^[2]; Stencel, J M ^[3]

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1. UNOCAL Corp., Brea, CA (United States)
2. Univ. of California, Santa Barbara (United States)
3. Univ. of Kentucky, Lexington (United States)

Solid state (wideline and magic angle spinning (MAS)) V-51 NMR has been used to study the speciation and typical components (the gel, clay, and zeolite) of a fluid cracking catalyst (FCC) resulting from systematic variation in vanadium loading. Formation of V{sub 2}O{sub 5} is seen at high vanadium concentrations and is observed to be dependent on the vanadium precursor and/or the conditions used in its preparation. In addition, at least three other species with different bonding environments can be distinguished based on differences in chemical shift and relaxation times. The relative proportions of these are observed to change as a function of vanadium concentration. The corresponding spectra are not only sensitive to the NMR experimental conditions but also to the presence of water coordination. Structural inferences are discussed in context with V-51 NMR studies of model compounds and previous laser Raman, ESR and X-ray investigations of these materials.

• OSTI ID: 7046861
• Report Number(s): CONF-900802-; CODEN: ACPCA
• Journal Information: American Chemical Society, Division of Petroleum Chemistry, Preprints; (United States), Vol. 35:4; Conference: 200. American Chemical Society (ACS) national meeting, Washington, DC (United States), 26-31 Aug 1990; ISSN 0569-3799
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
CATALYSTS
STRUCTURAL CHEMICAL ANALYSIS
PETROLEUM
CATALYTIC CRACKING
ALUMINIUM OXIDES
CLAYS
GELS
NUCLEAR MAGNETIC RESONANCE
RAMAN SPECTROSCOPY
SILICON OXIDES
VANADIUM
VANADIUM 51
VANADIUM OXIDES
WATER
X-RAY DIFFRACTION
ZEOLITES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
COLLOIDS
CRACKING
DECOMPOSITION
DIFFRACTION
DISPERSIONS
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROGEN COMPOUNDS
INORGANIC ION EXCHANGERS
INTERMEDIATE MASS NUCLEI
ION EXCHANGE MATERIALS
ISOTOPES
LASER SPECTROSCOPY
MAGNETIC RESONANCE
MATERIALS
METALS
MINERALS
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
RESONANCE
SCATTERING
SILICATE MINERALS
SILICON COMPOUNDS
SPECTROSCOPY
STABLE ISOTOPES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
VANADIUM ISOTOPES
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing