Alumina–titania binary mixed oxide used as support of catalysts for hydrotreating of Maya heavy crude

Maity, Samir; Ancheyta, Jorge; Soberanis, L.; Alonso, Fernando; Llanos, M. E.

doi:10.1016/s0926-860x(02)00571-9

Cited by 63 publications

(34 citation statements)

References 27 publications

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“…It has been reported that the presence of TiO 2 in the support facilitated the reduction and sulfidation for Ni-W phases, and decreased interactions between W oxide precursors with the support. Also, the presence of the Ti induced more WS 2 species than on alumina, favoring the hydrogenation route in the HDS of probe molecules, which requires hydrogenation of one of its aromatic rings before hydrodesulfurization [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol–Gel Titania–Alumina

et al. 2015

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This work showed that the use of Al 2 O 3 -TiO 2 as carriers has a positive effect on the activity of supported NiW catalysts in the hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene carried out in a batch reactor at 320°C and total H 2 pressure of 5.5 MPa. Two Al 2 O 3 -TiO 2 mixed oxides with Al/Ti atomic ratios of 10 and 2 were synthesized by sol-gel method together with the pure Al 2 O 3 synthesized as reference support. For NiW/ Al 2 O 3 -TiO 2 and NiW/Al 2 O 3 catalysts, a metal load of 17 and 5.5 wt% of W and Ni were considered respectively. It was found that both Al 2 O 3 -TiO 2 -supported catalysts exhibited higher activity than alumina-supported one. The catalyst with a largest TiO 2 content (NiW/AT2) demonstrated to be 23 % more active with respect to NiW/Al 2 O 3 . Solids were characterized by temperature-programmed reduction (TPR), high resolution transmission electronic microscopy and X-ray photoelectronic spectroscopy (XPS) techniques. A decrease in support-metal interaction (from TPR) was observed when Ti content increased, which could lead to a higher amount of NiWS phase (from XPS). Besides, a slight increase in the slabs length in WS 2 was observed for titania-containing catalyst with respect to NiW/Al 2 O 3 , indicating that the dispersion can still be optimized. The atomic ratio Al/Ti = 2 of the NiW/Al 2 O 3 -TiO 2 catalyst proved to be a potential substitute for current catalysts for sulfur reduction in ultra-clean diesel.

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Section: Introductionmentioning

confidence: 99%

Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol–Gel Titania–Alumina

et al. 2015

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“…However, unlike TiO 2 -Al 2 O 3 system that has been studied extensively and thoroughly because of its commercial prospects [8,9], the preparation and the properties of ZrO 2 -Al 2 O 3 as catalytic supports have not sufficiently been investigated yet. Mochida and coworkers [5] prepared zirconia-alumina supports by kneading pseudoboehmite powder and zirconia hydroxide powder with 3.2% HNO 3 and investigated the HDS of dibenzothiophene (DBT) on sulfided CoMo/ZrO 2 -Al 2 O 3 catalysts.…”

Section: Introductionmentioning

confidence: 99%

Characterization and catalytic application of homogeneous nano-composite oxides ZrO2–Al2O3

Zhang

et al. 2004

Catalysis Today

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“…However, thermal instability, low surface area and poor mechanical properties are significant drawbacks. In order to overcome these disadvantages, different methods of mixing TiO 2 with other oxides, such as Al 2 O 3 , SiO 2 and ZrO 2 , have been studied by several authors [7][8][9][10][11]. The catalytic results in HYD and HDS reactions suggested that an increase in dispersion may be responsible for an increase in activity [3].…”

Section: Introductionmentioning

confidence: 99%

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

et al. 2005

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Pd/Pt supported on pure and doped TiO 2 (TiO 2 -WO 3 and TiO 2 -WO 3 -SiO 2 ) were prepared and characterized by different techniques (XPS, TEM, XRD, H 2 -TPR and TPD of ammonia). These catalysts were investigated in the hydrogenation of tetralin at 6.0 MPa, checking also their thio-tolerance by feeding increasing amounts of dibenzothiophene (DBT, 300 and 1000 wt ppm). The catalytic activity followed the order: Pd/Pt-TiO 2 > Pd/Pt-TiO 2 -WO 3 -SiO 2 > Pd/Pt-TiO 2 -WO 3 , evidencing a negative role of a second oxide inside TiO 2 . The Pd/Pt-TiO 2 catalyst showed high activity regardless of reaction conditions (temperature, contact time, H 2 /tetralin ratio) together with a good thio-tolerance up to 300 wt ppm of DBT.

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Alumina–titania binary mixed oxide used as support of catalysts for hydrotreating of Maya heavy crude

Cited by 63 publications

References 27 publications

Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol–Gel Titania–Alumina

Deep Hydrodesulfurization of Dibenzothiophenes Over NiW Sulfide Catalysts Supported on Sol–Gel Titania–Alumina

Characterization and catalytic application of homogeneous nano-composite oxides ZrO2–Al2O3

Pd/Pt on Ti-containing Mixed Oxides as Dearomatization Catalysts: Physico-chemical Characterization and Activity

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