Formation and Catalytic Properties of Edge-Bonded Molybdenum Sulfide Catalysts on TiO2

Araki, Yasuhiro; Honna, Kôsaku; Shimada, Hiromichi

doi:10.1006/jcat.2002.3534

Cited by 55 publications

(36 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Figure 6 18) shows a TEM image of anatase-type TiO2 supported molybdenum sulfide catalyst which evidently shows that MoS2 layers were "standing on" the TiO2 surface. Detailed analysis of the interface geometry between MoS2 and anatase 19) showed the MoS2 crystals maintained epitaxial relationships with the anatase surface, for instance, (002)MoS2 (001)Anatase in Fig.…”

Section: Catalysts Supported On Anatase-type Tio2mentioning

confidence: 99%

See 1 more Smart Citation

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

Shimada

2016

J. Jpn. Petrol. Inst.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Catalysts Supported On Anatase-type Tio2mentioning

confidence: 99%

“…perature. 18) shows the HYD activities of the molybdenum sulfide catalysts listed in Table 5. Catalytic activity decreased with higher sulfidation temperature for the catalysts sulfided in H2S/N2.…”

Section: ) B) Relative Ratio Of Hds Reaction Path Via Direct S-extrumentioning

confidence: 99%

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

Shimada

2016

J. Jpn. Petrol. Inst.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, the role of MoS 2 crystals edge-bonded to the substrates has been debated [6][7][8]. Recently, edge-bonded particles have been found on γ-Al 2 O 3 [9,10] and anatase TiO 2 [11,12] substrates by transmission electron microscopy (TEM). These edge-bonded particles showed improved activity for hydrogenation [12].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, edge-bonded particles have been found on γ-Al 2 O 3 [9,10] and anatase TiO 2 [11,12] substrates by transmission electron microscopy (TEM). These edge-bonded particles showed improved activity for hydrogenation [12]. Therefore, a method for making various figures of MoS 2 clusters is needed to control catalytic reactions.…”

Section: Introductionmentioning

confidence: 99%

Microscope Observation of MoS2 Nanoparticles Synthesized on Rutile TiO2 Single Crystals

Uetsuka

Ōnishi

Harada

et al. 2004

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

Nanometer-sized particles of MoS2 were synthesized on (100), (001), and (110) surfaces of rutile TiO2. Molybdenum oxide was deposited on the TiO2 substrates and then sulfided to simulate the preparation of industrial catalysts. The nanoparticles which appeared on the sulfided surfaces were assigned to MoS2 particles. The topography of the nanoparticles was observed by atomic force microscopy (AFM) and by transmission electron microscopy (TEM). The number density of the nanoparticles was related to the surface energy of the substrates through the population of nucleation centers. On the TiO2(110) surface, AFM and TEM images assignable to MoS2 crystals edge-bonded to the substrate were observed. The coincidental lattice spacings of MoS2 and this particular surface were related to the observed edge-bonded growth.

show abstract

“…Nanometer-scale topography of MoS 2 particles deposited on a solid surface is of vital importance in those applications. The activity and selectivity of catalysts are thought to be sensitive to the morphology of MoS 2 clusters synthesized on various supports [4][5][6][7][8][9][10][11]. For example, MoS 2 clusters edge-bonded to substrate were synthesized on Al 2 O 3 [7,8] and TiO 2 [9] and exhibited an improved activity in the hydrogenation reaction of methylnaphthalene in comparison with basal-bonded clusters [10].…”

Section: Introductionmentioning

confidence: 99%

Atomic force microscope observation of MoS2 particles synthesized on mica, MoS2, and graphite

Uetsuka

Ōnishi

Ikeda

et al. 2003

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

Nanometer-sized particles of molybdenum oxide were thermally deposited and then sulfided on mica, MoS2, and highly oriented pyrolytic graphite (HOPG) to simulate MoS2 catalysts for the hydrodesulfurization reaction of petroleum. The topography of the particles observed by AFM reflected the interaction force dominant at the particle-substrate interfaces. Oxide particles ionically interacted with mica which restricted the mobility of the deposit and led to particles smaller in lateral dimension, whereas aggregated oxide was observed on the other non-ionic substrates. Basal-bonded MoS2 crystals were observed on the three substrates when sulfided at 673 K.

show abstract

Formation and Catalytic Properties of Edge-Bonded Molybdenum Sulfide Catalysts on TiO2

Cited by 55 publications

References 35 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

Microscope Observation of MoS2 Nanoparticles Synthesized on Rutile TiO2 Single Crystals

Atomic force microscope observation of MoS2 particles synthesized on mica, MoS2, and graphite

Contact Info

Product

Resources

About