Spectroscopic study of the electronic interactions in Ru/TiO2 HDS catalysts

Castillo-Villalón, Perla; Ramı́rez, Jorge

doi:10.1016/j.jcat.2009.08.014

Cited by 32 publications

(25 citation statements)

References 43 publications

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“…The sulfidation of the titania support with H 2 S(15%)/H 2 at 400 • C gives rise to the appearance of a signal with maximum around 428 nm, that is attributed to forbidden transitions (consequently much less intense) of Ti 3+ species in TiO 2 [14,67,68], which means that sulfidation causes some reduction of the support. To better see the inflections Fig.…”

Section: Uv-vis-nir Of Mo Sulfided Catalystsmentioning

confidence: 99%

“…UV-vis-NIR spectra of TiO2 and sulfided TiO2. conduction band of titania [68,72,73], therefore in the conduction band of molybdenum sulfide. The conduction band of MoS 2 has mixed contributions of Mo d orbitals (z 2 , xy, x 2 -y 2 ) and a greater contribution of S p orbitals (p z ), giving to the conduction band a S character [62].…”

Section: Uv-vis-nir Of Mo Sulfided Catalystsmentioning

confidence: 99%

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Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

et al. 2016

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Section: Uv-vis-nir Of Mo Sulfided Catalystsmentioning

confidence: 99%

Section: Uv-vis-nir Of Mo Sulfided Catalystsmentioning

confidence: 99%

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

et al. 2016

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“…Among different supports and their combinations with catalysts, Mo catalysts supported on TiO 2 displayed a higher intrinsic hydrodesulfurization (HDS) activity. 1,2 This high HDS activity was attributed to the well dispersed molybdena species and the support of titania made the formation of MoS 2 easier. However, the TiO 2 supports have an important disadvantage: they generally have low surface area and small pore size, which is caused by the agglomeration of TiO 2 particles.…”

Section: Introductionmentioning

confidence: 99%

A simple two-step method to synthesize the well-ordered mesoporous composite Ti-FDU-12 and its application in the hydrodesulfurization of DBT and 4,6-DMDBT

et al. 2014

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Mesoporous FDU-12 silicas with different morphologies have been synthesized under static and stirring conditions in a water bath. Furthermore, a series of mesoporous FDU-12 silicas modified by different amounts of titania have been synthesized, through a two-step method of prehydrolysis of TEOS followed by addition of titanium butoxide as a titanium precursor. Their respective NiMo supported catalysts were also prepared and characterized to elucidate the effects of titania, on the characteristics of the Mo surface species and their hydrodesulfurization (HDS) activities on dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The composites were characterized by various techniques (XRD, SEM, TEM, FT-IR, UV-vis, 29 Si NMR, Raman, XPS and N 2 adsorption-desorption); meanwhile, the catalysts were also tested in a higher pressure HDS reactor at T ¼ 340 C and P ¼ 4 MPa with different liquid hourly space velocity (LHSV) values. The results show that the two-step synthetic route can prepare well-ordered mesoporous composites with high surface areas and large pore sizes and volumes.Obvious differences in the Mo species can be observed on the sulfided NiMo/Ti-FDU-12 catalysts. This showed that appropriate Ti loading could facilitate the dispersion of molybdena and the formation of the MoS 2 and NiMoS phases, which are the important factors for the HDS reaction. All of the catalysts presented high HDS activity, and when the Si : Ti molar ratio was increased to 5, the HDS activities on DBT and 4,6-DMDBT could reach as high as 97% and 65% respectively.

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“…The reported E g of semiconductor TiO 2 is even reached up to 3.6 eV. [28] The doped-F and the TNT structure promote the decrease of the E g . [29] Figure 3d shows that almost all the visible light is reflected by the crystal TiO 2 (P25) powder, which is much higher than the a-TNTÀ F. This is consistent with the absorption test results.…”

Section: Physical-chemical Characterization Of the A-tnt-fmentioning

confidence: 99%

Photoelectrochemical Catalysis of Fluorine‐Doped Amorphous TiO₂ Nanotube Array for Water Splitting

Guo

Zhang

et al. 2020

ChemistrySelect

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In this paper, we report a fluorine‐doped amorphous titanium dioxide nano‐tube‐array (a‐TNT−F) catalyst for photo‐electrochemical water splitting. The a‐TNT−F can be activated by the full‐spectrum sunlight with the advantages of high efficiency, low cost, easily prepared and rich natural sources. X‐ray diffraction, scanning electron microscopy, transmission electron microscopy and other tests confirm the nano‐tube array structure of the a‐TNT−F. The photo‐electrochemical water splitting tests of a‐TNT−F are conducted under the condition of dark, visible light and modulated sunlight. Results show that the water can be split into hydrogen and oxygen with the electrolysis voltage of 1.2 V under the irradiation of modulated sunlight, which is even lower than the theoretical voltage (1.23 V) of water splitting. The amorphous structure and doped fluorine greatly decrease the polarization of oxygen evolution on the electrode. The catalytic performance of the annealed a‐TNT−F surpasses that of RuO2. We also ascertain the feasibility of combining a‐TNT−F with solar cell for water splitting in natural environment. The a‐TNT−F has great potential to be high performance catalyst for water splitting and has a bright future for large scale applications.

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Spectroscopic study of the electronic interactions in Ru/TiO2 HDS catalysts

Cited by 32 publications

References 43 publications

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

A simple two-step method to synthesize the well-ordered mesoporous composite Ti-FDU-12 and its application in the hydrodesulfurization of DBT and 4,6-DMDBT

Photoelectrochemical Catalysis of Fluorine‐Doped Amorphous TiO₂ Nanotube Array for Water Splitting

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Spectroscopic study of the electronic interactions in Ru/TiO2 HDS catalysts

Cited by 32 publications

References 43 publications

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

Influence of the support on the catalytic performance of Mo, CoMo, and NiMo catalysts supported on Al2O3 and TiO2 during the HDS of thiophene, dibenzothiophene, or 4,6-dimethyldibenzothiophene

A simple two-step method to synthesize the well-ordered mesoporous composite Ti-FDU-12 and its application in the hydrodesulfurization of DBT and 4,6-DMDBT

Photoelectrochemical Catalysis of Fluorine‐Doped Amorphous TiO2 Nanotube Array for Water Splitting

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Photoelectrochemical Catalysis of Fluorine‐Doped Amorphous TiO₂ Nanotube Array for Water Splitting