Morphology and orientation of MoS2 clusters on Al2O3 and TiO2 supports and their effect on catalytic performance

Shimada, Hiromichi

doi:10.1016/s0920-5861(03)00401-2

Cited by 139 publications

(84 citation statements)

References 49 publications

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“…We proposed a model of active catalytic sites as shown in Fig. 16 29) . The stacked MoS2 layers provide a larger number of edge sites for CUS than a large single-layered structure, but the bottom layer may not act as active catalytic sites due to steric hindrance (Fig.…”

Section: Summary and Discussionmentioning

confidence: 99%

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Shimada

2016

J. Jpn. Petrol. Inst.

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The relationships between the morphologies and dispersion of supported Mo sulfide catalysts and their catalytic functions evaluated by model test reactions are reviewed. The catalyst support had large effects on the morphologies through the electronic interaction and geometrical relationship between the catalyst and the support surface. High hydrogenation activities were obtained for Al2O3 supported catalysts due to high dispersion, whereas high hydrogenolysis activities were obtained for TiO2-supported catalysts due to the electronic interaction. Relatively large single-layered MoS2 structures were formed on the {110} γ-Al2O3 surface, whereas microclusters and multilayered MoS2 structures were more favorably formed on the {111} and {100} γ-Al2O3 surfaces. Multi-layered MoS2 structures had the edge-bonding orientation on anatase-TiO2 with an epitaxial relationship by sulfidation in H2S/N2. Single-layered MoS2 catalysts exhibited relatively hydrogenation-oriented function, whereas multilayered MoS2 catalysts had relatively hydrogenolysis-oriented function. Steric hindrance affected the catalytic functions, particularly in hydrogenation that required η 6 adsorption of aromatic rings. Long-term uses in hydrotreating caused growth of the MoS2 structures in the lateral direction, which decreased the number of active sites. Simultaneously, the aging caused deep sulfiding of the catalysts, which weakened the interaction with the support and increased the intrinsic activities of the catalysts.

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Section: Summary and Discussionmentioning

confidence: 99%

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Shimada

2016

J. Jpn. Petrol. Inst.

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“…Fourier transform infrared spectroscopy (FT-IR) and DRUV-vis were carried out as former reports illuminated that the Ti 41 ions could strengthen the metal-support interaction, which can provide better dispersion for active phases [16][17][18]. Figure 3 shows that the peak at 1630 cm 21 is associated to the bending of HÀ ÀOÀ ÀH from adsorbed water, and the broad peak at 1185 cm 21 refers to the asymmetrical stretching of SiÀ ÀOÀ ÀSi within the mesoporous structure [25].…”

Section: Ft-ir Druv-vis and Nh 3 -Tpdmentioning

confidence: 99%

“…It is well known that TiO 2 is good support for VOCs catalytic oxidation, which was extensively investigated in recent decades [13][14][15]. Zepeda et al [16] revealed that the presence of Ti 41 ions could strengthen the metalsupport interaction, and titanium atoms could provide better dispersion for active phases over the support [17,18]. However, the Ti-modified SBA-15 mesoporous materials have been seldom reported in catalytic oxidation of benzene-like VOCs.…”

Section: Introductionmentioning

confidence: 99%

Preparation and investigation of PD/TI‐SBA‐15 catalysts for catalytic oxidation of benzene

Peng

Cheng

et al. 2010

Env Prog and Sustain Energy

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The feasibility of Pd/Ti‐SBA‐15 catalysts in the elimination of benzene was explored comprehensively. The effects of the titanium incorporation on catalyst physicochemical property and activity were investigated by X‐ray diffraction, N2 adsorption/desorption, Fourier transform infrared spectroscopy, DRUV–vis, NH3‐TPD, scanning electron microscope, and transmission electron microscope techniques. Only a certain quantity of titanium can be incorporated into the support, and titanium has a positive influence on active phase dispersion. Titanium‐modified catalysts possess larger pore diameter than the pure Pd/SBA‐15 and titanium can introduce the acid sites to the support. The evaluation result shows that the titanium incorporation can noticeably improve the catalytic activity, and all evaluated catalysts possess excellent stability, without obviously activity loss during 60 h test. © 2010 American Institute of Chemical Engineers Environ Prog, 2010

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“…Several reasons like increased acidity, increased dispersion of active phase, improved sulfidability or reducibility, state of promoters etc. have been suggested for the good performance of Ti containing mixed oxide HDS catalysts [28][29][30][31][32][33]. Activities of the above catalyst were compared with -Al 2 O 3 , SBA-15 and Al-SBA-15 supported Mo, CoMo, and NiMo catalyst.…”

Section: Introductionmentioning

confidence: 99%

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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Morphology and orientation of MoS2 clusters on Al2O3 and TiO2 supports and their effect on catalytic performance

Cited by 139 publications

References 49 publications

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Morphology, Dispersion and Catalytic Functions of Supported Molybdenum Sulfide Catalysts for Hydrotreating Petroleum Fractions

Preparation and investigation of PD/TI‐SBA‐15 catalysts for catalytic oxidation of benzene

TiO2-ZrO2 Binary Oxides for Effective Hydrodesulfurization Catalysts

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