Influence of water and ammonia on hydrotreating catalysts and activity for tetralin hydrogenation

Chadwick, David; Oen, Amy; Siewe, C.

doi:10.1016/0920-5861(95)00276-6

Cited by 9 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The catalyst recovered its initial activity when ammonia was suppressed from the feed. Similar results were reported by Satterfield and Gültekin concerning the hydrogenation of propylbenzene and by Chadwick et al regarding the hydrogenation of tetralin. However, Mignard et al observed that the ammonia inhibiting effect on toluene hydrogenation over a NiMo based catalyst was only partially reversible.…”

Section: Resultssupporting

confidence: 90%

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

et al. 2001

View full text Add to dashboard Cite

Toluene hydrogenation was studied within a wide range of hydrogen sulfide, hydrogen, toluene, and ammonia partial pressures on a standard sulfided NiMo/Al2O3 hydrotreating catalyst at 350 °C under a total pressure of 4.9−9.8 MPa. The results showed a complex inhibiting effect of H2S on the hydrogenation activity with an order of reaction relative to H2S varying between −0.05 and −0.5. Unexpectedly, this inhibiting effect was enhanced by the presence of ammonia. Several kinetic models based on the homolytic or heterolytic dissociation of hydrogen and hydrogen sulfide were investigated and discriminated by using the CHEMKIN/SURFACE CHEMKIN II tool. The heterolytic dissociation was supposed to occur on centers composed of an unsaturated Mo ion (on which hydride ions and organic molecules can adsorb) and of a sulfur anion, host of the proton generated by the heterolytic dissociation of hydrogen or hydrogen sulfide. It was concluded that toluene hydrogenation was most likely to occur through a heterolytic mechanism starting with a hydride addition followed by a proton addition. In the range of H2S partial pressures investigated, the latter was the rate-determining step.

show abstract

Section: Resultssupporting

confidence: 90%

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

et al. 2001

View full text Add to dashboard Cite

show abstract

“…It is clear that the adsorption strength increases in the order quinoline \ indole \ tetrahydroquinoline \ indoline \ ammonia. The strong inhibiting effect of ammonia is in qualitative agreement with previous studies [14,15].…”

Section: Concentrations Of Added Nitrogen Containing Molecules In Ppmsupporting

confidence: 92%

Inhibition of the Hydrogenation and Hydrodesulfurization Reactions by Nitrogen Compounds over NiMo/Al2O3

et al. 2008

View full text Add to dashboard Cite

The inhibiting effect of nitrogen compounds on the hydrogenation of aromatic compounds and on the hydrodesulphurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6 DMDBT), has been systematically investigated over a commercial NiMo hydrotreating catalyst. Amongst the different nitrogen compounds considered, interestingly ammonia was found to have the strongest inhibition effect on hydrogenation as well as on hydrodesulfurization reactions. The inhibiting effects were found to increase in the order quinoline \ tetrahydroquinoline \ indole \ indoline \ ammonia for phenanthrene/tetralin hydrogenation and HDS reactions. The molecules with nitrogen atoms having higher negative Mulliken charges showed higher adsorption constants.

show abstract

“…Tetrahydronaphthalene (tetralin) has been frequently used to represent aromatics in diesel fuels in hydrogenation reactions [21][22][23][24][25]. The most widely accepted hydrogenation pathway includes D 1,9 -octalin (octahydronaphthalene) as an intermediate that is further hydrogenated to the cis-or trans-decalin product.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the hydrogenation of tetralin on supported Ni, Pt, and Pd catalysts

et al. 2007

View full text Add to dashboard Cite

Influence of water and ammonia on hydrotreating catalysts and activity for tetralin hydrogenation

Cited by 9 publications

References 10 publications

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

Inhibition of the Hydrogenation and Hydrodesulfurization Reactions by Nitrogen Compounds over NiMo/Al2O3

Comparative study of the hydrogenation of tetralin on supported Ni, Pt, and Pd catalysts

Contact Info

Product

Resources

About

Influence of water and ammonia on hydrotreating catalysts and activity for tetralin hydrogenation

Cited by 9 publications

References 10 publications

Kinetic Modeling of the Effect of H2S and of NH3 on Toluene Hydrogenation in the Presence of a NiMo/Al2O3 Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

Kinetic Modeling of the Effect of H2S and of NH3 on Toluene Hydrogenation in the Presence of a NiMo/Al2O3 Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

Inhibition of the Hydrogenation and Hydrodesulfurization Reactions by Nitrogen Compounds over NiMo/Al2O3

Comparative study of the hydrogenation of tetralin on supported Ni, Pt, and Pd catalysts

Contact Info

Product

Resources

About

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models

Kinetic Modeling of the Effect of H₂S and of NH₃ on Toluene Hydrogenation in the Presence of a NiMo/Al₂O₃ Hydrotreating Catalyst. Discrimination between Homolytic and Heterolytic Models