Effect of solvo-thermal treatment temperature on the properties of sol–gel ZrO2–TiO2 mixed oxides as HDS catalyst supports

Barrera, María C.; Escobar, José; Reyes, J.A. de los; Cortés, María A.; Viniegra, M.; Hernández, Ana Cristina Gallego

doi:10.1016/j.cattod.2006.06.030

Cited by 23 publications

(13 citation statements)

References 33 publications

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“…Small bands around 450-590 cm -1 may be assigned to the presence of zirconia phases. Bands at 1629-1630 cm -1 may be attributed to the undissociated water molecules co-ordinated to surface cationic centres suggesting interactions between adsorbed water and surface cationic species in the mixed oxides which is in agreement with the observation of Barrera et al [36]. Fig.…”

Section: Ftir Analysissupporting

confidence: 91%

TiO2-ZrO2 Binary Oxides for Effective Hydrodesulfurization Catalysts

Tiwari¹

2012

TOCATJ

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Titania-zirconia mixed oxide was developed as support for Mo, CoMo and NiMo catalysts. Synthesis was carried out using evaporation induced self assembly and modified sol-gel templating route. The samples were calcined in a temperature range of 400 o C to 600 o C. SEM and porosity analyses were used to ensure that the mesostructure is stable after Mo and promoter incorporation. Wide-angle XRD was used to verify MoO 3 (and MoS 2 ) dispersion, which indicated crystallite size <40Å up to 8wt% Mo loading. The IR spectral studies were used to determine the nature of Mo species (octahedral and tetrahedral). TPD study was used to determine the acidity of the supports. The physico-chemical properties were correlated with the catalytic hydrodesulfurization reaction. CoMo and NiMo catalysts were compared in order to gain an insight into the promoter effect on direct desulfurization pathways. A comparison with -Al 2 O 3 , SBA-15 and KIT-6 supported catalysts shows much superior activities of mesoporous titania-zirconia supported catalysts which is attributed to favorable metal-support interactions in case of mesoporous titania-zirconia supported catalysts.

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Section: Ftir Analysissupporting

confidence: 91%

TiO2-ZrO2 Binary Oxides for Effective Hydrodesulfurization Catalysts

Tiwari¹

2012

TOCATJ

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“…The presence of large pores in catalyst particles is imperative in heavy oil processing: heavy molecules are allowed to diffuse through the pores and reach the active sites [12]. In heavy oil hydrocracking, the rate determining step is the diffusion of large molecules through the catalyst pores to reach the active sites [13].…”

Section: Introductionmentioning

confidence: 99%

Macroporous NiMo/alumina catalyst for the hydrocracking of vacuum residue

Kim

Nguyen‐Huy

Shin

2014

Reac Kinet Mech Cat

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We prepared a macro-mesoporous NiMo/alumina catalyst by the introduction of macroporosity to an alumina support, and tested its catalytic performance in the hydrocracking of vacuum residue for the first time. In this reaction, the use of the macro-mesoporous NiMo/alumina catalyst clearly led to a more desirable product distribution-a higher liquid yield and lower gas yield-than a mesoporous NiMo/alumina catalyst. This indicates that the macro-mesoporous catalyst structure facilitated hydrogenation relative to the mesoporous catalyst; for the latter, hydrocracking was relatively dominant. N 2 adsorption/desorption experiments confirmed that NiMo impregnation reduced the pore size and volume, as well as the surface area, implying that the NiMo phases were located inside the mesopores and macropores. Macroporosity in the alumina support played an important role in improving the accessibility of vacuum residue to the NiMo active sites located inside pores, which are responsible for hydrogenation. By promoting hydrogenation, the macro-mesoporous NiMo/alumina catalyst increased the liquid yield of the hydrocracking of vacuum residue.Electronic supplementary material The online version of this article (

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“…Solvothermal temperatures of < 240 C (for 1 day) retained the X-ray amorphous nature of the mixed oxides. 33,34 Other studies demonstrated the benecial addition of ammonia to the solvothermal solution in enlarging the pores of mesoporous anatase TiO 2 nanospheres. 28 The combined effect of solvothermal reaction time and ammonia content, at a given reaction temperature, inuenced the crystallization process of the spheres, consequently affecting their nal porosity, surface area, and morphology.…”

Section: Introductionmentioning

confidence: 99%