Surface structure and functionality of bauxite-based catalysts in the hydrotreating of heavy crudes

Conference · Wed Sep 01 00:00:00 EDT 1982 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5382399

Vecchi, C; Maringo, S; Iannibello, A; Girelli, A

The functionality of molybdenum- and tungsten-containing, bauxite-based catalysts in the hydrotreating of heavy feedstocks in trickle flow conditions was compared. The step addition technique proved to be an efficient method for studying the chemisorption properties of potential catalyst supports and for preparing catalytic systems in which Mo(VI) and W(VI) are present as surface phases with equivalent degree of dispersion. Experiments carried out on these catalytic systems, showed the better performance of molybdenum-based systems compared to tungsten-based catalysts. A strict correlation was observed between the properties of the bauxite-based catalysts and those of the corresponding alumina-based systems. Nuclear Magnetic Resonance results were in accordance with the information on the functionality of the hydrotreating catalysts obtained in trickle flow conditions and allow for a deeper insight into the structural modifications induced in the feedstock by catalytic hydroprocessing. The removal of ethero-atoms lowers the aromaticity of the samples and the degree of condensation of the aromatic structures. Only a moderate hydrogenation of the aromatic rings can be observed. The increase in methyl substituted aromatic carbons suggests that the C-C bond cleavage in side chains takes place in BETA position. (JMT)

• Research Organization: Stazione sperimentale per i Combustibili, San Donato Milanese, Italy
• OSTI ID: 5382399
• Report Number(s): CONF-820909-Vol.1
• Journal Information: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Vol. 27:3; Conference: National meeting of the American Chemical Society, Kansas City, MO, USA, 12 Sep 1982
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BAUXITE
CATALYTIC EFFECTS
CATALYST SUPPORTS
CHEMISORPTION
PERFORMANCE TESTING
MOLYBDENUM COMPOUNDS
TUNGSTEN COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BENCH-SCALE EXPERIMENTS
CATALYSTS
CATALYTIC CRACKING
HYDROCRACKING
MOLECULAR STRUCTURE
MOLYBDENUM
PETROLEUM
PETROLEUM INDUSTRY
PETROLEUM REFINERIES
TUNGSTEN
VISCOSITY
ALUMINIUM COMPOUNDS
ALUMINIUM ORES
CHALCOGENIDES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INDUSTRIAL PLANTS
INDUSTRY
METALS
ORES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PYROLYSIS
SEPARATION PROCESSES
SORPTION
TESTING
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
020400* - Petroleum- Processing
400201 - Chemical & Physicochemical Properties