Hydrotreatment catalyst poisoning by vanadium and nickel porphyrin: ESR and NMR

Ledoux, Marc J.; Hantzer, S.

doi:10.1016/0920-5861(90)80005-a

Cited by 32 publications

(11 citation statements)

References 4 publications

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“…Due to the presence of vanadium and nickel, petroporphyrins may cause significant detrimental effects in petroleum refining processes [6,7]. The development of technologies for petroporphyrin isolation from heavy oil feedstocks can help solve some problems concerning heavy oil upgrading and will open up for the industry an access to low-cost petroporphyrins as an alternative to synthetic phthalocyanines widely used in catalysis, medicine, optical and electronic devices, etc.…”

Section: Introductionmentioning

confidence: 99%

Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

et al. 2021

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In the present work, the first data on the catalytic activity of d-metal complexes of petroleum porphyrins obtained via two-stage re-metallization (acid demetallization with subsequent metalation) of high-purity petroleum vanadyl porphyrins are presented. During acid demetallization of petroleum vanadyl porphyrins, the highest yield (49%) and spectral purity of free petroporphyrin bases were achieved with concentrated sulfuric acid and a diluted solution of vanadyl porphyrins in chloroform. In the series of divalent cations of Mn, Fe, Co, Ni, Cu, and Zn, only the last four metals are complexed with demetallated petroporphyrins without significant changes in their component composition, whereas the interaction with Mn and Fe cations causes an evident structural transformation or even full degradation of petroporphyrin macrocycles, respectively. The composition and spectral purity of petroleum porphyrin-containing reactants and products were analyzed by FT-IR, UV-Vis, NMR, and MALDI-TOF mass spectroscopic methods. The obtained petroporphyrin-based d-metal complexes were assayed by the reaction of 2-mercaptoethanol oxidative dimerization, in which the copper porphyrins exhibited the highest catalytic activity.

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Section: Introductionmentioning

confidence: 99%

Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

et al. 2021

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“…Many techniques are used to characterize asphaltenes . Spectroscopic techniques, such as infrared (IR), nuclear magnetic resonance (NMR), mass spectroscopy (MS), , size-exclusion chromatography (SEC), , and Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS), provide information about the chemical nature of asphaltenes, but this is not sufficient to establish its molecular composition. Several authors showed that, according to the crude oil origin, asphaltenes display varied differences in composition and structure. ,, Nowadays, the chemical structures of metallic compounds are not well-known and not yet well understood as a result of the complexity of the matrix .…”

Section: Introductionmentioning

confidence: 99%

Applications of Pulsed Electron Paramagnetic Resonance Spectroscopy to the Identification of Vanadyl Complexes in Asphaltene Molecules. Part 2: Hydrotreatment Monitoring

et al. 2017

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The potential of electron paramagnetic resonance (EPR) spectroscopy to provide structural information on vanadyl species in asphaltene fractions was evaluated. The evolution of the chemical environment of vanadium during the fixed-bed hydrotreating process was studied. This study shows that asphaltenes are composed of two types of environment: porphyrinic and non-porphyrinic structures. The hydroconversion process reduced by 40% the participation of non-porphyrinic species, while the porphyrinic complexes only diminished by 15%, which demonstrates that porphyrinic species are the most refractory to hydroconversion.

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“…The rising demand of light environmentally friendly fuels has led to heavy oil refinery technologies such as fluid catalytic cracking (RFCC) and residue hydrocracking (RHC), which are widely applied in the modern refinery industry. Nickel and vanadium content in crude oil is low; however, they are concentrated on residue oil and great damaged harm to RFCC and RHC, which can lead to catalyst poisoning, decreased product yield, and reduced operating cycle time (Ledoux and Hantzer, 1990;Kim and Massoth, 1993). So it is very important to reduce nickel and vanadium content in crude oil.…”

Section: Introductionmentioning

confidence: 99%

Removal of Nickel and Vanadium from Crude Oil by Microwave-Chemical Method. I. Chemical Method

Wen

Yang

et al. 2013

Petroleum Science and Technology

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WY series demetalizers, some types of thiocarbamate, were synthesized by organic amine (diethylene triamine and triethylene tetramine), carbon disulfide, and sodium hydroxide and used to remove nickel and vanadium from crude oil. WY-1 demetallizer has excellent removal of nickel and vanadium efficiency for Shengli crude oil and Iran crude oil. The nickel and vanadium removal efficiency of Shengli crude oil reached 43.41 and 41.63% at the dosage of WY-1 500 mg/L, reaction time 30 min, and reaction temperature 70 ı C. With the dosage of WY-1 and increasing reaction time and reaction temperature, the nickel and vanadium removal efficiency of crude oil increased.

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Hydrotreatment catalyst poisoning by vanadium and nickel porphyrin: ESR and NMR

Cited by 32 publications

References 4 publications

Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

Applications of Pulsed Electron Paramagnetic Resonance Spectroscopy to the Identification of Vanadyl Complexes in Asphaltene Molecules. Part 2: Hydrotreatment Monitoring

Removal of Nickel and Vanadium from Crude Oil by Microwave-Chemical Method. I. Chemical Method

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