The effect of nitrogen in feed on coke formation in hydrotreating

Koide, Ryutaro; Fukase, Satoshi; Al-Barood, A.; Al-Dolama, K.; Stanislaus, A.; Absi‐Halabi, M.

doi:10.1016/s0167-2991(99)80495-9

Cited by 2 publications

(2 citation statements)

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“…On the other hand, extensive studies have been made to clarify the deactivation mechanism of the catalyst for HDS of heavy oil (Christensen et al, 1994;Iijima et al, 1997;Gualda & Kasztelan, 1994;Furimsky & Massoth, 1999;Yamazaki et al, 1999;Fujii et al, 2000;Idei et al, 2002aIdei et al, ,b, 2003Ternan et al, 1979;Egiebor et al, 1989;Díez et al, 1990Díez et al, , 1992de Jong et al, 1991de Jong et al, , 1994Hadjiloizou et al, 1992;Zeuthen et al, 1994Zeuthen et al, , 1995Marafi & Stanislaus, 1997;Koide et al, 1999;Seki & Yoshimoto, 2001a,b,c,d;Kumata et al, 2001;Callejas et al, 2001;Higashi et al, 2002;Amemiya et al, 2003;Sahoo et al, 2004;Hauser et al, 2005;Eijsbouts & Inoue, 1994). Based on these studies, it has been suggested that catalyst deactivation is caused by (i) deposition of V and/or Ni sulfides originated from metalloporphyrin compounds in heavy oil (Christensen et al, 1994;Iijima et al, 1997;Gualda & Kasztelan, 1994;Furimsky & Massoth, 1999;Yamazaki et al, 1999;Fujii et al, 2000;Idei et al, 2002aIdei et al, ,b, 2003, (ii) deposition of carbonaceous compounds (Gualda & Kasztelan, 1994;Furimsky & Massoth, 1999;…”

Section: Introductionmentioning

confidence: 99%

Quasiin situNiK-edge EXAFS investigation of the spent NiMo catalyst from ultra-deep hydrodesulfurization of gas oil in a commercial plant

et al. 2010

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Ni species on the spent NiMo catalyst from ultra-deep hydrodesulfurization of gas oil in a commercial plant were studied by Ni K-edge EXAFS and TEM measurement without contact of the catalysts with air. The Ni-Mo coordination shell related to the Ni-Mo-S phase was observed in the spent catalyst by quasi in situ Ni K-edge EXAFS measurement with a newly constructed high-pressure chamber. The coordination number of this shell was almost identical to that obtained by in situ Ni K-edge EXAFS measurement of the fresh catalyst sulfided at 1.1 MPa. On the other hand, large agglomerates of Ni(3)S(2) were observed only in the spent catalyst by quasi in situ TEM/EDX measurement. MoS(2)-like slabs were sintered slightly on the spent catalyst, where they were destacked to form monolayer slabs. These results suggest that the Ni-Mo-S phase is preserved on the spent catalyst and Ni(3)S(2) agglomerates are formed by sintering of Ni(3)S(2) species originally present on the fresh catalyst.

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Section: Introductionmentioning

confidence: 99%

Quasiin situNiK-edge EXAFS investigation of the spent NiMo catalyst from ultra-deep hydrodesulfurization of gas oil in a commercial plant

et al. 2010

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“…Coke deposition on the catalyst surface is widely recognized as a major factor in the deactivation of HDS catalysts in gas oil HDS processes [18,24]. Several deactivation mechanisms for coke deposition have been proposed [25][26][27][28][29]. Richardson et al proposed a model in which coke deposits form on the support, away from the active metal sulfides [30].…”

Section: Deactivation Behaviormentioning

confidence: 99%