Effect of cobalt on stability and hydrodesulfurization activity of molybdenum containing y zeolites

Cid, R.; Orellana, F; Agudo, Antonio

doi:10.1016/s0166-9834(00)80635-1

Cited by 48 publications

(17 citation statements)

References 10 publications

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“…Most likely, only single metal sulfide phases will be formed in the zeolite pores, explaining why for each bimetallic catalyst the conversion is determined by the most active single metal sulfide component. In a few papers synergetic effects are claimed for thiophene HDS (Cid et al, 1987;Laniecki and Zmierczak, 1991) and benzene hydrogenation (Leglise et al, 1988) over zeolite Y-supported Co-Mo and Ni-Mo catalysts. These promoter effects are however very small.…”

Section: Discussionmentioning

confidence: 99%

“…These promoter effects are however very small. In some cases (Cid et al, 1987;Laniecki and Zmierczak, 19911, the activity of the bimetallic catalysts is hardly higher than the combined activity of the monometallic catalysts. The promoter effect observed by Leglise et al (1988) may also be explained by the formation of a NiMoS phase in the somewhat larger voids and defects usually present in stabilized Y zeolites (Leglise et al, 1988).…”

Section: Discussionmentioning

confidence: 99%

“…Hydrocracking catalysts consisting of a zeolite-supported CoMoS or NiMoS phase might show a substantially higher hydrocracking activity than the single metal sulfide catalysts. Several studies (Cid et al, 1985(Cid et al, , 1987Davidova et al, 1986;Leglise et al, 1988;Kovacheva et al, 1991;Laniecki and Zmierczak, 1991) have been performed to investigate the promoter effect on sulfided zeolite-supported bimetallic Co-Mo or NiMo catalysts. In some of them a promoter effect is reported, for instance by Cid et al (1987) and Laniecki and Zmierczak (1991) for thiophene hydrodesulfurization (HDS) and by Leglise et al (1988) for benzene hydrogenation at medium high pressure.…”

Section: Introductionmentioning

confidence: 99%

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Hydrocracking of n-Decane over Zeolite-Supported Metal Sulfide Catalysts. 2. Zeolite Y-Supported Ni and Ni-Mo Sulfides

Welters¹,

Beer²,

Santen³

1995

Ind. Eng. Chem. Res.

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. (1995). Hydrocracking of ndecane over zeolite-supported metal sulfide catalysts. 2. Zeolite Y-supported Ni and Ni-Mo sulfides. Industrial and Engineering Chemistry Research, 34(4), 1166-1171. DOI: 10.1021/ie00043a019General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. For zeolite Y-supported nickel sulfide catalysts the influence of the metal sulfide dispersion on the hydrocracking properties for n-decane is examined. In order to obtain different nickel sulfide distributions (inside or outside the zeolite structure) and dispersions, the preparation method (impregnation of CaY or ion exchange of Nay), sulfidation procedure (direct sulfidation or sulfidation after drying), and metal loading are varied. A higher nickel sulfide surface (as measured by dynamic oxygen chemisorption) results in a strong increase of the n-decane conversion, but this is not accompanied by an improvement of the catalytic properties toward ideal hydrocracking. Additionally, some zeolite Y-supported Ni-Mo sulfide catalysts (varying in preparation method and sulfidation procedure) are tested for the hydroconversion of n-decane.However, no promoter effect could be observed. The activity of the bimetallic sulfide catalysts is always almost equal to that of the most active monometallic sulfide constituent.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrocracking of n-Decane over Zeolite-Supported Metal Sulfide Catalysts. 2. Zeolite Y-Supported Ni and Ni-Mo Sulfides

Welters¹,

Beer²,

Santen³

1995

Ind. Eng. Chem. Res.

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“…In order to understand the catalytic properties of these bimetallic catalysts a thorough characterization and understanding of their monometallic counterparts is first needed. Therefore, in recent years fundamental research directed to the application of zeolite materials as supports for molybdenum compounds (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) has increased. However, only a few of these studies deal with the characterization of molybdenum-loaded zeolites in the sulfided state (14)(15)(16)(17)(18)(19).…”

Section: Introductionmentioning

confidence: 99%

NaY-Supported Molybdenum Sulfide Catalysts

Welters

Vorbeck²,

Zandbergen³

et al. 1996

Journal of Catalysis

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“…HDS catalysts are based on CoMo/ Al2O3 or NiMo/Al2O3 with various modifications, such as use of tungsten instead of molybdenum 2) 9) , additives such as silica 10) 15) , phosphorus 16) 24) , boria 13),22), 25) 28) , fluorine 29) 35) , zeolite related materials 36) 42) , titania 13),43) 51) and others, and optimized preparation method and physicochemical properties s u c h a s s h a p e , p o r e s i z e d i s t r i b u t i o n , a n d others 15 . Strangely enough, the origin of HDS catalysts is rarely described.…”

Section: Randd History Of Hds Catalystmentioning

confidence: 99%

Regeneration of Residue Hydrodesulfurization Catalyst

Iwamoto

2013

J. Jpn. Petrol. Inst.

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Reuse of residue hydrodesulfurization catalyst is very important, as a large volume of this catalyst is exchanged every year due to the high deactivation rate. However, stable regeneration of this catalyst is more difficult than for distillate HDS catalysts due to the more severe regeneration conditions and the presence of vanadium. Regeneration technologies of residue hydrodesulfurization catalyst are reviewed to assess the differences between regeneration of distillate HDS catalysts, mechanism of residue HDS catalyst regeneration, commercial regeneration, properties, structure, and activities of regenerated residue HDS catalyst, effect of vanadium and improvement of catalyst suitable for regeneration. The presence of vanadium accelerates both insufficient recovery of activity and reduced catalyst strength due to formation of NiMoO4 and Al2(SO4)3, respectively. However, removal of vanadium might be not essential. Vanadium acts indirectly as oxidative catalyst and increases the regeneration temperature and transformation of SOx into H2SO4. Therefore, milder regenerated conditions and control of the properties of used catalyst as well as improvement of catalyst may allow improved regeneration.

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Effect of cobalt on stability and hydrodesulfurization activity of molybdenum containing y zeolites

Cited by 48 publications

References 10 publications

Hydrocracking of n-Decane over Zeolite-Supported Metal Sulfide Catalysts. 2. Zeolite Y-Supported Ni and Ni-Mo Sulfides

Hydrocracking of n-Decane over Zeolite-Supported Metal Sulfide Catalysts. 2. Zeolite Y-Supported Ni and Ni-Mo Sulfides

NaY-Supported Molybdenum Sulfide Catalysts

Regeneration of Residue Hydrodesulfurization Catalyst

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