Improvement of HDS catalysts through the modification of the oxidic precursor with 1,5-pentanediol: Gas phase sulfidation and thiophene conversion

Blanchard, Pascal; Frizi, Naïma; Mary, S. Jhancy; Baranek, Pascale; Lancelot, Christine; Lamonier, Carole; Payen, Edmond

doi:10.1016/j.crci.2016.04.009

Cited by 7 publications

(2 citation statements)

References 59 publications

(51 reference statements)

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“…The bridging of Mo centers by sulfido and disulfido ligands is accompanied by the formation of Mo(V) centers as discussed in the previous section. The presence of such a paramagnetic center is consistent with the electron spin resonance signal reported at the early stage of sulfiding (5 min at 60 °C) and interpreted by Payen et al and Blanchard et al as resulting from the formation of Mo(V) oxysulfide species. A step further was achieved in our present work compared to the aforementioned papers with a more detailed identification of the oxysulfide species, with formula Mo 3 S 6 O 6 (Al) 3 .…”

Section: Discussionsupporting

confidence: 89%

Intermediate Species Revealed during Sulfidation of Bimetallic Hydrotreating Catalyst: A Multivariate Analysis of Combined Time-Resolved Spectroscopies

et al. 2017

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For the first time, the sulfidation process of a bimetallic NiMo catalyst supported on alumina has been followed by combining time-resolved laser Raman spectroscopy (LRS) and X-ray absorption spectroscopy (XAS) quasi simultaneously at both Ni and Mo K edges. Multivariate data analysis reveals that the thermal activation upon 15% H2S/H2 atmosphere of a dehydrated-calcined NiMo(VI) catalyst involves (i) a 5-stepped mechanism with oxysulfided or fully sulfided Mo intermediate species and (ii) a direct transformation of oxidic nickel species into NiS x and NiMoS ones. Complementary information extracted from LRS and Quick-XAS data permitted to identify at the early stage of the sulfidation the trimeric Mo(V/VI) oxysulfide species [Mo3(μ2O)4(μ2S)μ2{S2}(Ot)2(St)3] grafted to the support surface, which is quickly transformed into the Mo(IV) intermediate species [Mo3(μ3S)(μ2S)2μ2{S2}(Ot)2{S2}t]. Above 190 °C, the Mo(IV) second intermediate is transformed into Mo(IV)S3, itself transformed into the final Mo(IV)S2 at T > 220 °C. Thanks to the unambiguous comparison of sulfidation kinetics for both metals the incorporation of promoter into the extended sulfidic molybdenum-based phase has been unprecedentedly related to the formation of the MoS3 intermediate species.

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Section: Discussionsupporting

confidence: 89%

Intermediate Species Revealed during Sulfidation of Bimetallic Hydrotreating Catalyst: A Multivariate Analysis of Combined Time-Resolved Spectroscopies

et al. 2017

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“…Among all the promoted catalysts, CoMoOx/PANI_65 contains the highest fraction (CoMoSx/PANI_thioA_30) > MoS2 (CoMoSx/PANI_H2S_30). This result is supported by the fact that the formation of mixed phases is favored when the sulfiding process occurs simultaneously for both metals Mo and Co [47], which qualitatively follows the same order.…”

Section: Catalyst Characterization After Catalytic Testssupporting

confidence: 52%

Hybrid CoMoS - polyaniline nanowires catalysts for hydrodesulfurisation applications

Ghosh

Courthéoux

Brunet

et al. 2021

Applied Catalysis A: General

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Liquid and gas phase sulfidation conditions of MoOx/PANI hybrids result in different MoSx phases • Active CoMoS phase content in the final catalysts deposited through a surface reaction using cobalt acetylacetonate depends on the nature of starting Mo based PANI materials.The formation of mixed sites is favored when Mo and Co sulfidations are simultaneous.• CoMoS/PANI showed much better catalytic activities than the CoMoS counterpart prepared without PANI• HDS of 3-methylthiophene is correlated to the Co/Moedges+corners atomic ratio as well as the HDS / HYD selectivity factor.

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The Pivotal Role of Catalysis in France: Selected Examples of Recent Advances and Future Prospects.

et al. 2017

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Improvement of HDS catalysts through the modification of the oxidic precursor with 1,5-pentanediol: Gas phase sulfidation and thiophene conversion

Cited by 7 publications

References 59 publications

Intermediate Species Revealed during Sulfidation of Bimetallic Hydrotreating Catalyst: A Multivariate Analysis of Combined Time-Resolved Spectroscopies

Intermediate Species Revealed during Sulfidation of Bimetallic Hydrotreating Catalyst: A Multivariate Analysis of Combined Time-Resolved Spectroscopies

Hybrid CoMoS - polyaniline nanowires catalysts for hydrodesulfurisation applications

The Pivotal Role of Catalysis in France: Selected Examples of Recent Advances and Future Prospects.

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