The Catalytic Performance of Metalloporphyrins during Hydrogenation of Anthracene

Liu, He; Ji, Shengyue; Wang, Zongxian; Guo, Aijun

doi:10.1002/ente.201402124

Cited by 7 publications

(14 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, it can be deduced that the catalytic activity presented by Ni‐OEP might also be derived from the in situ formation of nickel sulfided species, even if the dispersed MoS 2 catalyst was absent. This result is well supported by our previous observation ,. It provides the possibility to make use of the inherent metalloporphyrins in heavy oils during primary upgrading process aimed at reducing viscosity.…”

Section: Resultssupporting

confidence: 90%

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ

Liu

Wang

et al. 2018

ChemistrySelect

Self Cite

View full text Add to dashboard Cite

Hydrogenation of nickel octaethylporphyrin (Ni‐OEP) over dispersed MoS2 catalysts was studied in a batch autoclave at relatively low temperatures ranging from 553 K to 593 K. In spite of the transformation of catalytic species, invariant rate constants are acceptable to analyze the kinetics in the given temperature range. It turns out that the first hydrogenation of Ni‐OEP is the rate limiting step when the dispersed catalysts are present. With the combined analysis of XRD and XPS patterns, Ni species deposited on the surface of the catalysts were determined. As much as 66.7% of nickel exists in the mixed “NiMoS” phase, and a small amount of sulfided phase of nickel is implied. The influence of metal deposits on the catalytic activity of catalysts for hydrogenation was evaluated using anthracene as the model compounds. The conversion of anthracene over MoS2 shows to be promoted with Ni‐OEP added. It is suggested that Ni‐OEP could be hydrogenated and involved with the formation of active catalytic species. As a result, Ni‐OEP could cooperate with the dispersed MoS2 catalyst for catalyzing the anthracene hydrogenation.

show abstract

Section: Resultssupporting

confidence: 90%

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ

Liu

Wang

et al. 2018

ChemistrySelect

Self Cite

View full text Add to dashboard Cite

show abstract

“…With reaction ongoing, a slight increase for naphthalene conversion by NiTPP was observed. This phenomenon has also been reportedin our previous work using anthracene as substrate .…”

Section: Resultsmentioning

confidence: 99%

“…Results indicated that MTPP greatly enhanced the conversion of naphthalene by aid of sulfur. It suggests that sulphidation favors the catalytic performance of MPs, which agrees well with our previous report . NiTPP appeared to be more active for catalyzing the hydrogenation than VOTPP.…”

Section: Resultsmentioning

confidence: 99%

“…Since the metalloporphyrins with high purity were precious and the catalytic species may be rare, standard inert α‐Al 2 O 3 was used as the carrier for the in situ formed solids. We have identified the metal species by fourier transform infrared spectroscopy (FT‐IR), XPS, Raman and energy dispersive X‐ray analysis (EDAX) previously . In this article, we mainly target the transformation of metal species with pressure and temperature varying by Raman and HRTEM.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Temperature and Pressure Effects on the Catalytic Performance of Metalloporphyrins during Hydrogenation of Naphthalene

et al. 2017

Self Cite

View full text Add to dashboard Cite

Temperature and pressure effects on the catalytic performance of metalloporphyrins (MPs) for naphthalene hydrogenation were studied. Naphthalene hydrogenation over MPs and sulfur (S), or S alone was examined at varying temperatures and pressures. MPs showed catalytic activity for naphthalene hydrogenation by aid of S. The catalytic activity was promoted by increasing pressure and temperature. The promotion for nickel porphyrinseemed stronger than that for vanadyl porphyrin. Excessive temperature hindered catalytic performance due to coke formation. To reveal role of temperature and pressure in catalytic performance of MPs, the demetalation was traced by ultraviolet‐visible(UV/Vis) spectroscopy, and catalytic species were characterized by Raman and high‐resolution transmission electron microscopy (HRTEM). High catalytic activity was correlated with high conversion of MPs. The catalytic species were mixtures of different nickel sulfide phases. High pressure and temperature facilitatedformation of crystalline metal sulfides. This work can provide guidance for activating inherent MPs in heavy oil more effectively during hydroconversion.

show abstract

“…It has been reported that metalloporphyrins with higher DBE tend to present a higher reactivity. 6,28 This results in the increase of relative abundance of types with lower DBE. The relative abundance of For the detected N 4 VOS porphyrins in the feed F V , their DBE values range from 20 to 27.…”

Section: Methodsmentioning

confidence: 99%

Transformation of Petroporphyrins-Enriched Subfractions from Atmospheric Residue during Noncatalytic Thermal Process under Hydrogen by Positive-Ion Electrospray Ionization FT-ICR Mass Spectrometry

Liu

Wang

et al. 2016

Energy Fuels

Self Cite

View full text Add to dashboard Cite

Nickel and vanadyl porphyrins were separated from atmospheric residue of Canadian oil sand bitumen by solvent extraction and column chromatography and then subjected to noncatalytic thermal process under hydrogen. The petroporphyrins before and after thermal process were characterized by UV−vis spectroscopy and positive-ion electrospray ionization FT-ICR mass spectroscopy to probe their structural transformation. Three main vanadyl porphyrins, including N 4 VO, N 4 VOS, and N 4 VO 2 and a fraction of N 5 VO 2 are identified in the feed fraction. With time increasing, the relative abundance of C n H 2n−28 N 4 VO (DBE = 17) increases initially and then decreases, in contrast with C n H 2n−26 N 4 VO (DBE = 18). It suggests the hydrogenation and rapid hydrogenolysis of petroporphyrins. The carbon number shifts to the lower mass range with increased process severity, indicating extensive thermal cracking reactions of petroporphyrins have occurred. N 4 VOS porphyrins show very similar variation of DBE and carbon number distribution as N 4 VO. A considerable proportion of new types of N 4 VO 2 , N 4 VO 3 and N 5 VO 2 are identified in the product after 30 min by accurate mass measurement and isotopic distribution. Under more severe conditions, these new species gradually diminish. It is inferred that the new species could most possibly derive from disassociation of large molecules in addition to chemical transformation. H 2 S and high hydrogen pressure could promote the hydrogenation of petroporphyrins. H 2 S can also enhance their thermal cracking reaction while high hydrogen pressure inhibits it. Nickel porphyrins present almost the same phenomena with vanadyl porphyrins, though with low content. Analysis of the petroporphyrins at the molecular level reveals their behavior and transformation during thermal process under hydrogen and could also benefit the catalysts design in HDM process.

show abstract

The Catalytic Performance of Metalloporphyrins during Hydrogenation of Anthracene

Cited by 7 publications

References 36 publications

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ

Temperature and Pressure Effects on the Catalytic Performance of Metalloporphyrins during Hydrogenation of Naphthalene

Transformation of Petroporphyrins-Enriched Subfractions from Atmospheric Residue during Noncatalytic Thermal Process under Hydrogen by Positive-Ion Electrospray Ionization FT-ICR Mass Spectrometry

Contact Info

Product

Resources

About

The Catalytic Performance of Metalloporphyrins during Hydrogenation of Anthracene

Cited by 7 publications

References 36 publications

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS2 Catalysts Formed In Situ

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS2 Catalysts Formed In Situ

Temperature and Pressure Effects on the Catalytic Performance of Metalloporphyrins during Hydrogenation of Naphthalene

Transformation of Petroporphyrins-Enriched Subfractions from Atmospheric Residue during Noncatalytic Thermal Process under Hydrogen by Positive-Ion Electrospray Ionization FT-ICR Mass Spectrometry

Contact Info

Product

Resources

About

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ

Hydrogenation of Nickel Octaethylporphyrin over Dispersed MoS₂ Catalysts Formed In Situ