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

Abstract

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)

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

Citation Formats

Vecchi, C, Maringo, S, Iannibello, A, and Girelli, A. Surface structure and functionality of bauxite-based catalysts in the hydrotreating of heavy crudes. United States: N. p., 1982. Web.
Vecchi, C, Maringo, S, Iannibello, A, & Girelli, A. Surface structure and functionality of bauxite-based catalysts in the hydrotreating of heavy crudes. United States.
Vecchi, C, Maringo, S, Iannibello, A, and Girelli, A. 1982. "Surface structure and functionality of bauxite-based catalysts in the hydrotreating of heavy crudes". United States.
@article{osti_5382399,
title = {Surface structure and functionality of bauxite-based catalysts in the hydrotreating of heavy crudes},
author = {Vecchi, C and Maringo, S and Iannibello, A and Girelli, A},
abstractNote = {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)},
doi = {},
url = {https://www.osti.gov/biblio/5382399}, journal = {Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)},
number = ,
volume = 27:3,
place = {United States},
year = {Wed Sep 01 00:00:00 EDT 1982},
month = {Wed Sep 01 00:00:00 EDT 1982}
}

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