Catalytic removal of sulfur, nitrogen, and oxygen from heavy gas oil

Furimsky, Edward

doi:10.1002/aic.690250213

Cited by 29 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There might be some relstion between this result and the fact that the H/C value of carbonaceous material on monomodal catalyst was higher than that for bimodal catalyst (Stiegel et a1 1983). The relative increases of nitrogen and oxygen compounds in extracts L, M and N indicated that the basic and polar compounds were strongly adsorbed on the catalyst surface (Furimsky 1978(Furimsky , 1979(Furimsky , 1982. …”

Section: Resultsmentioning

confidence: 99%

EFFECT OF Ni-Mo CATALYST MESOPORE DIAMETER ON CATALYTIC ACTIVITIES IN HYDROTREATING OF COAL LIQUID

Yoshimura

Sato

Shimada

et al. 1986

Fuel Science and Technology International

View full text Add to dashboard Cite

A mixed 450•‹C+ vacuum residue obtained from Austrarian brown coal-derived oil with hydrogenated creosote oil was hydrogenated to elucidate the effect of catalyst mesopore diameter on the activities of N~-M O -% -A~~O~ catalysts.Catalyst activities, especially for the heavy fraction in feedstock, were evaluated mainly by the conversion of 35O0Cf residue to 350•‹C-oil (HDC) . hydrodesulfurization (HDS) and hydrodenitrogenation (HDN).These decreased in the order of HDS>HDN>HDC; whereas the deactivation rate during 50 hours on stream decreased in the order of HDC>HDN>HDS due to carbonaceous deposits on the catalyst. HDC. HDS and HDN rates per unit surface area of catalyst indicated that the HDS reaction was more strongly influenced by pore diffusion than the HDN and HDC reactions. The heavy ends in feedstock (such as asphaltenes) contained higher amounts of oxygen and nitrogen compounds. These polar compounds tended to be accumulated on the catalyst surface as the precursors for the formation of carbonaceous material deposits.The profile of carbon inside catalyst particle indicated that mesopore size of 22.6 nm might be satisfactory for reactant molecules to diffuse to the center of catalyst particle and access all of the active sites effectively. Downloaded by [UZH Hauptbibliothek / Zentralbibliothek Zürich] at 04:31 03 January 2015 YOSHIMURA ET AL.

show abstract

Section: Resultsmentioning

confidence: 99%

EFFECT OF Ni-Mo CATALYST MESOPORE DIAMETER ON CATALYTIC ACTIVITIES IN HYDROTREATING OF COAL LIQUID

Yoshimura

Sato

Shimada

et al. 1986

Fuel Science and Technology International

View full text Add to dashboard Cite

show abstract

“…For a similar gas oil (at about 650 K, 8.0 MPa, and over NiMo/Al 2 O 3 ), it was easier to remove five-membered N-rings than six-membered N-rings (497). HDO (499). Under these conditions, the following reactivity order was established: HDS .…”

Section: Hydrodenitrogenation Of Petroleummentioning

confidence: 99%

Hydrodenitrogenation of Petroleum

Furimsky¹,

2005

Self Cite

View full text Add to dashboard Cite

A high level of hydrodenitrogenation (HDN) is required to achieve a desirable conversion of other hydroprocessing reactions. This results from a strong adsorption of nitrogen-containing compounds on catalytic sites that slows down the hydrogen activation process and hinders the adsorption of other reactants. Studies on model compounds and real feeds indicate that less than 50 ppm of nitrogen in the feed can poison catalytic sites. Kinetic studies determined adsorption constants of various nitrogen-containing compounds and concluded that at least four different catalytic sites are required to interpret experimental observations in contrast with a dual site site ffi concept, which only considered two sites. The advancements in experimental techniques allowed identification of products formed during very early stages of hydrodenitrogenation. These results confirmed that the removal of the amino group from saturated amines, as the last step in hydrodenitrogenation, is governed by the type of carbon to which the amino group is attached rather than the number of hydrogen atoms attached to carbon in a and b position to nitrogen Performance of conventional Co(Ni)Mo(W)/Al 2 O 3 catalysts during hydrodenitrogenation was enhanced by combination with various additives and by replacing the traditionally used g-Al 2 O 3 support with novel supports. Catalytic functionalities could be modified by using different precursors of active metals and varying conditions during preparation. Progress has been made in the development of catalysts possessing a high selectivity for hydrodenitrogenation. In this case, the nonconventional catalysts based on the carbides and nitrides of transition metals exhibited high activity and selectivity. Noble metal sulfides alone or supported on different supports were active for HDN as well. Feedstocks used for catalyst evaluation included model compounds and mixtures of model compounds as well as real feeds. The challenges in the development of catalysts for hydrodenitrogenation of heavy feeds containing asphaltenes and metals have been identified.In general, compared to Q, conversions were little affected by a methyl (Me) on the aromatic ring, while being lower for Me on the N-ring, except for 2-MeQ. It is evident that Me substitution in the 2-position had little effect on HDN over the NiMoP/Al 2 O 3 catalyst, whereas it actually enhanced the HDN rate over the CoMo/Al 2 O 3 catalyst. For both catalysts the HDN rate was suppressed in 6-MeQ and particularly in 3-MeQ and 4-MeQ. The distribution of N-containing intermediates was influenced by the ring substitution and the type of catalyst. This suggests that several factors influence the overall HDN mechanism of Qs. This should be kept in mind while analyzing differences in the networks proposed by different authors.The preceding discussion on the HDN of Q mostly referred to conventional catalysts. A number of studies on the HDN of Q were conducted over unconventional catalysts. For example, 3-and 4-MeQs were more reactive than Q over the unsupported Zr,...

show abstract

“…Coke deposition within the catalyst structure is one of the factors imposing intra-particle diffusion limitations to both reactant and product molecules either by partial or complete pore plugging mechanism [7]. Furthermore, coke containing N-O heteroatoms affect catalyst activity poisoning acidic active sites [8,9].It is also accepted that coke develops from reactive, unstable hydrocarbon species (coke precursors) with small or large molecular sizes( resins, heterocyclic compounds and Asphaltenes) [10,11,12].…”

Section: Coke Deposition and Propertiesmentioning

confidence: 99%

Deposits Effects on Catalysts Porous Structure and Chemical Activity during Residuum Catalytic Hydro-treatment

Amous¹

2018

ujes

View full text Add to dashboard Cite

Catalyst Porous structure parameters and activity were investigated during the catalytic hydro-treatment of Heavy Arabian Oil atmospheric residuum utilizing a fixed bed catalytic reactor with recycle. Two model Hydro-treating catalysts CAT-1 containing 0.5 wt% Molecular Sieves (MS) 13X, and CAT-2, having different physical and chemical properties were used in this investigation. Spent, extracted and dried, catalyst samples were analyzed for their physical features and chemical deposits for both types, CAT-1 and CAT-2, with sizes having (Lp o) = 0. 059 mm and �� 1 = 0.326 mm. It was found that carbonaceous deposits on CAT-1, �� 0 =0. 059 mm approached 41.91 wt% (S, C, H and N) g/100 g regen. Cat.. The porous structure parameters were affected by the deposited materials. Surface areas lost due to deposits were in the range of 45 to 55% and pore volumes decrease was in the range of 43 to 52% compared with the fresh samples. Probable pore diameters decreased from around 80 Å to 43 Å. Pores in the range between 105 to 165 Å disappeared Especially in CAT-1 samples. Coke content of S, C, H, and N with respect to the weight of the regenerated catalyst was around 4.0, 34.0, 1.9 and 0.50 wt. % respectively. Vanadium (V) and Nickle (Ni) contents were in the range 0.63 and 0.27 wt. % respectively. Extracted and dried spent catalysts samples were oxidized with dry air stream at 380˚C. Upon regeneration the carbonaceous deposits were removed and the porous structure parameters were recovered up to levels approaching 79-89% of those recorded for the fresh samples, depending on their sizes.

show abstract

Catalytic removal of sulfur, nitrogen, and oxygen from heavy gas oil

Cited by 29 publications

References 16 publications

EFFECT OF Ni-Mo CATALYST MESOPORE DIAMETER ON CATALYTIC ACTIVITIES IN HYDROTREATING OF COAL LIQUID

EFFECT OF Ni-Mo CATALYST MESOPORE DIAMETER ON CATALYTIC ACTIVITIES IN HYDROTREATING OF COAL LIQUID

Hydrodenitrogenation of Petroleum

Deposits Effects on Catalysts Porous Structure and Chemical Activity during Residuum Catalytic Hydro-treatment

Contact Info

Product

Resources

About