Investigation of Sulfur Behavior on Mo-based Hydrodesulfurization Catalysts Supported on High Surface Area TiO&lt;sub&gt;2&lt;/sub&gt; by &lt;sup&gt;35&lt;/sup&gt;S Radioisotope Tracer Method

Ishihara, Atsushi; Dumeignil, Franck; Wang, Danhong; Li, Xiangguo; Arakawa, H.; Qian, Eika W.; Inoue, Satoshi; Muto, Akinori; Kabe, Toshiaki

doi:10.1627/jpi.48.37

Cited by 12 publications

(9 citation statements)

References 24 publications

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“…fluorine [2,3], phosphorus [4][5][6][7][8][9] or boron [10][11][12][13][14]. In addition, other active phases such as WS 2 [15][16][17][18][19], CrS x [20][21][22][23][24], noble metals [25][26][27][28][29][30][31][32][33][34][35][36][37], as well as other supports than alumina such as TiO 2 or mixed oxides [38][39][40][41][42][43][44][45][46][47][48] or carbon [49] and zeolites [50,51] were also investigated, giving a large pallet of a...…”

Section: Introductionmentioning

confidence: 99%

Description of coordinatively unsaturated sites regeneration over MoS2-based HDS catalysts using 35S experiments combined with computer simulations

Dumeignil

Paul²,

Veilly³

et al. 2005

Applied Catalysis A: General

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Section: Introductionmentioning

confidence: 99%

Description of coordinatively unsaturated sites regeneration over MoS2-based HDS catalysts using 35S experiments combined with computer simulations

Dumeignil

Paul²,

Veilly³

et al. 2005

Applied Catalysis A: General

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“…The effect of the Co/Mo ratio on the sulfur behavior was investi gated for the series of CMT16 catalysts (CoMo/TiO2, MoO3 16 wt％) at 300℃. Note that 16 wt％ was the optimal MoO3 loading for non-promoted catalysts sup ported on the high SSA titania as shown above 30) . The results are plotted in Table 2.…”

Section: Hds Activities and Sulfur Mobility Of Como Catalysts Supportmentioning

confidence: 86%

“…Catalysts Supported on High Specific Surface Area Titania 30) The DBT HDS activities of the Mo/TiO2 catalysts with high specific surface area were measured at 320℃. Figure 8 shows the effect of Mo content on HDS activity.…”

Section: Hds Activities and Sulfur Mobility Of Momentioning

confidence: 99%

Sulfidation State and Sulfur Behavior on Mo-based HDS Catalysts Supported on TiO2 Using 35S 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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“…In our previous studies, the catalytic results obtained in the reaction of HDS of DBT over Mo/TiO2-based catalysts were interpreted based on the properties of the so-called TiMoS phase 51),52), 54) , which is formed under HDS working conditions. In this catalytic system, the titania support acts as a promoter of the MoS2 phase 64) , even if some points are controversial 65) .…”

Section: Non-promoted Mos2 Catalysts Supported Onmentioning

confidence: 99%

“…The use of TiO2 also increases the mobility of the sulfur atoms 49),50) 52),54),55), 61) . The DBT HDS activity of the non-promoted MoS2 phase can be increased by using high SSA titania support 50), 54) . Such MoS2/TiO2 catalysts are signifi cantly…”

Section: Introductionmentioning

confidence: 99%

γ-アルミナ担持および高表面積チタニア担持モリブデン，コバルト-モリブデン，ニッケル-モリブデン水素化脱硫触媒挙動の35Sトレーサー法に基づいた比較

篤

Dumeignil

一也

et al. 2007

J. Jpn. Petrol. Inst.

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The differences between MoS2, CoMoS and NiMoS HDS catalysts supported on γ-alumina and high SSA titania are investigated based on the results of [ 35 S]DBT HDS experiments. Previous studies of MoS2 and CoMoS are reviewed, discussed and compared with new results for NiMoS. Introduction of Ni or Co to MoS2/Al2O3 catalysts classically yields a signifi cant increase in HDS performance. Irrespective of the promoter, an increase in S0, the number of labile sulfur atoms, is observed. In contrast, kRE kRE k , the H2S liberation rate constant, plotted as a function of the Ni/Mo ratio, presents a volcano profi le on Ni-promoted catalysts, but kRE kRE k reaches a plateau from low Co/Mo ratios on Co-promoted catalysts. The TiMoS phase, which is formed in-situ during HDS on Mo/ TiO2 catalysts, promotes sulfur mobility and makes Mo/TiO2 catalysts more active than Mo/Al2O3 catalysts. Nevertheless, CoMo/TiO2 catalysts are less active than CoMo/Al2O3 catalysts because further promotion of TiMoS phase with Co might yield excessive weakening of the metal _ sulfur bonds, and/or some Co atoms might be lost in the TiO2 matrix without interacting with MoS2. In contrast, introduction of Ni to Mo/TiO2 catalysts yields significant increases in both kRE and S0. The NiMo/TiO2 catalysts exhibit HDS performances close to those of Al2O3-supported catalysts. Clearly catalytic behavior over Co-and Ni-promoted catalysts is different.

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Investigation of Sulfur Behavior on Mo-based Hydrodesulfurization Catalysts Supported on High Surface Area TiO<sub>2</sub> by <sup>35</sup>S Radioisotope Tracer Method

Cited by 12 publications

References 24 publications

Description of coordinatively unsaturated sites regeneration over MoS2-based HDS catalysts using 35S experiments combined with computer simulations

Description of coordinatively unsaturated sites regeneration over MoS2-based HDS catalysts using 35S experiments combined with computer simulations

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

γ-アルミナ担持および高表面積チタニア担持モリブデン，コバルト-モリブデン，ニッケル-モリブデン水素化脱硫触媒挙動の<sup>35</sup>Sトレーサー法に基づいた比較

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