The Role of Titania Support in Mo-Based Hydrodesulfurization Catalysts

Ramirez, Jorge; Cedeño, Luis; Busca, Guido

doi:10.1006/jcat.1999.2451

Cited by 114 publications

(56 citation statements)

References 26 publications

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“…The spectrum at 3768 cm -1 is labeled type 1, the most reactive hydroxyl groups on the tetrahedral aluminum cations [28], the spectrum at 3730 cm -1 refers to type 2, the OH groups on octahedral aluminum cations [29], and finally type 3 at 3679-3681 cm -1 refers to bridging OH groups [28]. Type 1 interacts strongly with the active phase and prevents electronic promotion of the active phase by titanium in the catalyst network [30], i.e., a proper preparation method for the mixed supports is that one in which type-1 hydroxyl groups are consumed by titanium.…”

Section: Ft-ir Analysis In the O-h Stretching Region Of The Supportsmentioning

confidence: 99%

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Moradi

Parvari

2011

Chem Eng & Technol

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Hydrodesulfurization (HDS) of dibenzothiophene in a batch reactor was performed at 5.5 MPa and 320°C on CoMoS/Al 2 O 3 -TiO 2 using trans-1,2-cyclohexanediamine-N,N,N′,N′-tetraacetic acid (CYDTA) as a complexing agent for the preparation method. The effects of titania, concentration of CYDTA, and preparation procedure were investigated by using X-ray diffraction, BET, Fourier transform infrared spectroscopy, and temperature-programmed desorption of ammonia experiments. The catalyst prepared by impregnation with c-alumina and titanium isopropoxide as raw materials and a CYDTA/Co mole ratio of 1.2 provided an HDS activity (on a pseudo-first-order kinetic constant basis) value ∼3.8 times higher compared to that of a CoMo/Al 2 O 3 catalyst.

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Section: Ft-ir Analysis In the O-h Stretching Region Of The Supportsmentioning

confidence: 99%

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Moradi

Parvari

2011

Chem Eng & Technol

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“…The improvement of these catalysts demands understanding of the active phase formation and their relation with the hydrodesulfurization activity. In spite of numerous studies of the support effect, there is no clear opinion on its participation in the formation and stabilization of active sites in the supported Co (Ni)-Mo (W) catalysts [3,4]. The promotor role also retains not clear [5].…”

Section: Introductionmentioning

confidence: 91%

Support effect on the formation of catalytic site precursors in the thiophene hydrodesulfurization

et al. 2006

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The TiO 2 and Al 2 O 3 supported FeMo catalysts (6 and 12 wt.% Mo) have been prepared using (NH 4 ) 3 Fe(OH) 6 Mo 6 O 18 salt (FeMo 6 ). They have been studied by the IR, TPR, XPS and MS methods and tested in thiophene conversion. The initial salt transforms in analog of the TiMo acid anion on the titania support and alumina heteropolymolybdate anion on the alumina support. Higher thiophene conversion is observed on the TiO 2 supported catalysts.

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“…Therefore, TiO2 electronic promotion of Mo will change the reducibility of Mo species 38) . UV-vis diffuse reflectance spectroscopy (DRS) investigation showed that the Ti3d levels and titania conduction band of TiO2 containing catalyst are located at much lower energies closer to those of the Mo4d orbitals 39) . Therefore, the supported Mo sulfide active phase also has semiconductor properties.…”

Section: )23)mentioning

confidence: 99%

Sulfidation State and Sulfur Behavior on Mo-based HDS Catalysts Supported on TiO<sub>2</sub> Using <sup>35</sup>S Tracer Methods

Ishihara

2008

J. Jpn. Petrol. Inst.

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A35 S radioisotope pulse tracer method using 35 S-labeled H2S was used to investigate the sulfidation state of Mo-based catalysts supported on TiO2. Despite the coverage of Mo species on the TiO2 support, sulfidation of the TiO2 support still occurred at 300℃. The sulfided catalysts could be reduced under H2 atmosphere. A 35 S radioisotope tracer method using 35 S-labeled dibenzothiophene ([ 35 S]DBT) was used to determine the sulfur mobility on the working sulfided Mo/TiO2 catalysts. The amount of labile sulfur (So), which represents the amount of active sites, and the release rate constant of H2S, which represents the mobility of the active site (kRE), were estimated. Compared with Mo/Al2O3 catalyst, Mo/TiO2 catalyst had slightly higher So and about 2 times higher kRE, which indicate that new mobile active sites were formed on sulfided Mo/TiO2 catalyst. Comparison of the kRE and So of titania-based and alumina-based catalysts suggested that the active phase consisted of a 'TiMoS' phase exhibiting a promoting effect similar to the well-known 'CoMoS' phase (promotion of the MoS2 active phase by Ti atoms). Hydrodesulfurization (HDS) of DBT was evaluated over Mo catalysts supported on titania synthesized by the pH swing method, which provides a TiO2 carrier with a high specific surface area (134 m

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The Role of Titania Support in Mo-Based Hydrodesulfurization Catalysts

Cited by 114 publications

References 26 publications

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Hydrodesulfurization‐Supported Catalysts: Effect of the Preparation Method

Support effect on the formation of catalytic site precursors in the thiophene hydrodesulfurization

Sulfidation State and Sulfur Behavior on Mo-based HDS Catalysts Supported on TiO<sub>2</sub> Using <sup>35</sup>S Tracer Methods

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