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Influence of the Phase Composition of Dispersed Molybdenum Catalyst on the Transformation of High-Molecular-Mass Components in Hydroconversion of Heavy Petroleum Feedstock
https://orcid.org/https://orcid.org/0000-0003-0802-4077
https://orcid.org/https://orcid.org/0000-0002-4336-8599
https://orcid.org/https://orcid.org/0000-0003-3336-5367
https://orcid.org/https://orcid.org/0000-0003-3639-1317
https://orcid.org/https://orcid.org/0000-0002-6644-9287
https://orcid.org/https://orcid.org/0000-0003-2458-6686
https://orcid.org/https://orcid.org/0000-0001-8705-114X
The influence of the phase composition of the dispersed molybdenum catalyst on the transformation of high-molecular-mass components (resins and asphaltenes) in the course of hydroconversion of heavy petroleum feedstock was studied. Suspensions of catalyst particles were prepared from inverse emulsions of aqueous solutions of the precursor, ammonium paramolybdate, directly in the feed in the course of hydroconversion (in situ), or the catalyst suspension was synthesized in advance (ex situ) and then was added to the feed. The vacuum residue from petroleum distillation and heavy crude were used as the feedstock. Experiments were performed in a flow-through reactor under the conditions of hydroconversion with the addition of a sulfur donor to the feed. Catalyst particles with different ratios of the Mo sulfide and oxide phases were prepared ex situ. With an increase in the МoS2 content of the dispersed catalyst, its activity in inhibition of chain reactions of thermal cracking, yielding resins, asphaltenes, and coke, increases. The conversion of the >500°С fraction in the presence of the catalyst decreases; this is probably due to saturation and neutralization with active hydrogen of primary radicals that are generated in the course of thermal degradation, initiate the chain reaction of thermal cracking, and favor its propagation.
Influence of the Phase Composition of Dispersed Molybdenum Catalyst on the Transformation of High-Molecular-Mass Components in Hydroconversion of Heavy Petroleum Feedstock
https://orcid.org/https://orcid.org/0000-0003-0802-4077
https://orcid.org/https://orcid.org/0000-0002-4336-8599
https://orcid.org/https://orcid.org/0000-0003-3336-5367
https://orcid.org/https://orcid.org/0000-0003-3639-1317
https://orcid.org/https://orcid.org/0000-0002-6644-9287
https://orcid.org/https://orcid.org/0000-0003-2458-6686
https://orcid.org/https://orcid.org/0000-0001-8705-114X
The influence of the phase composition of the dispersed molybdenum catalyst on the transformation of high-molecular-mass components (resins and asphaltenes) in the course of hydroconversion of heavy petroleum feedstock was studied. Suspensions of catalyst particles were prepared from inverse emulsions of aqueous solutions of the precursor, ammonium paramolybdate, directly in the feed in the course of hydroconversion (in situ), or the catalyst suspension was synthesized in advance (ex situ) and then was added to the feed. The vacuum residue from petroleum distillation and heavy crude were used as the feedstock. Experiments were performed in a flow-through reactor under the conditions of hydroconversion with the addition of a sulfur donor to the feed. Catalyst particles with different ratios of the Mo sulfide and oxide phases were prepared ex situ. With an increase in the МoS2 content of the dispersed catalyst, its activity in inhibition of chain reactions of thermal cracking, yielding resins, asphaltenes, and coke, increases. The conversion of the >500°С fraction in the presence of the catalyst decreases; this is probably due to saturation and neutralization with active hydrogen of primary radicals that are generated in the course of thermal degradation, initiate the chain reaction of thermal cracking, and favor its propagation.
Influence of the Phase Composition of Dispersed Molybdenum Catalyst on the Transformation of High-Molecular-Mass Components in Hydroconversion of Heavy Petroleum Feedstock
https://orcid.org/https://orcid.org/0000-0003-0802-4077
https://orcid.org/https://orcid.org/0000-0002-4336-8599
https://orcid.org/https://orcid.org/0000-0003-3336-5367
https://orcid.org/https://orcid.org/0000-0003-3639-1317
https://orcid.org/https://orcid.org/0000-0002-6644-9287
https://orcid.org/https://orcid.org/0000-0003-2458-6686
https://orcid.org/https://orcid.org/0000-0001-8705-114X
The influence of the phase composition of the dispersed molybdenum catalyst on the transformation of high-molecular-mass components (resins and asphaltenes) in the course of hydroconversion of heavy petroleum feedstock was studied. Suspensions of catalyst particles were prepared from inverse emulsions of aqueous solutions of the precursor, ammonium paramolybdate, directly in the feed in the course of hydroconversion (in situ), or the catalyst suspension was synthesized in advance (ex situ) and then was added to the feed. The vacuum residue from petroleum distillation and heavy crude were used as the feedstock. Experiments were performed in a flow-through reactor under the conditions of hydroconversion with the addition of a sulfur donor to the feed. Catalyst particles with different ratios of the Mo sulfide and oxide phases were prepared ex situ. With an increase in the МoS2 content of the dispersed catalyst, its activity in inhibition of chain reactions of thermal cracking, yielding resins, asphaltenes, and coke, increases. The conversion of the >500°С fraction in the presence of the catalyst decreases; this is probably due to saturation and neutralization with active hydrogen of primary radicals that are generated in the course of thermal degradation, initiate the chain reaction of thermal cracking, and favor its propagation.
Influence of the Phase Composition of Dispersed Molybdenum Catalyst on the Transformation of High-Molecular-Mass Components in Hydroconversion of Heavy Petroleum Feedstock
Pet. Chem.
Batov, A. E. (author) / Visaliev, M. Ya. (author) / Zekel’, L. A. (author) / Kubrin, N. A. (author) / Dandaev, A. U. (author) / Gyul’maliev, A. M. (author) / Kadiev, Kh. M. (author)
Petroleum Chemistry ; 63 ; 663-673
2023-06-01
11 pages
Article (Journal)
Electronic Resource
English
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