Structure and catalytic activity of CoMo/γ-Al2O3 and CoMo/Sio2 hydrodesulphurization catalysts: an xps and esr characterization of sulfided used catalysts

Gajardo, P.; Mathieux, A.; Grange, Paul; Delmon, Bernard

doi:10.1016/0166-9834(82)80268-6

Cited by 55 publications

(13 citation statements)

References 55 publications

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“…oxygen vacancy) which may weaken C−O bond upon adsorption of the reactant or intermediates on the active site. Efficient supports could obviously influence the catalytic activity of active species in Mo‐based catalysts by stabilizing specific oxidation states, or by influencing geometric configurations, electronic properties and finally prevalence of “high‐energy” sites . Investigation results of reactivity and stability of different supported MoO 3 catalysts (supports including SiO 2 , γ ‐Al 2 O 3 , TiO 2 , ZrO 2 , and CeO 2 ) for HDO of m ‐cresol indicated that ZrO 2 and TiO 2 were optimal supports which could promote activity and improve stability of a typical MoO 3 catalyst.…”

Section: Hydrodeoxygenation Using H2mentioning

confidence: 99%

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

et al. 2019

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Catalytic hydrodeoxygenation (HDO) is a fundamental process for bio-resources upgrading to produce transportation fuels or added value chemicals. The bottleneck of this technology to be implemented at commercial scale is its dependence on high pressure hydrogen, an expensive resource which utilization also poses safety concerns. In this scenario, the development of hydrogen-free alternatives to facilitate oxygen removal in biomass derived compounds is a major challenge for catalysis science but at the same time it could revolutionize biomass processing technologies. In this review we have analysed several novel approaches, including catalytic transfer hydrogenation (CTH), combined reforming and hydrodeoxygenation, metal hydrolysis and subsequent hydrodeoxygenation along with non-thermal plasma (NTP) to avoid the supply of external H 2 . The knowledge accumulated from traditional HDO sets the grounds for catalysts and processes development among the hydrogen alternatives. In this sense, mechanistic aspects for HDO and the proposed alternatives are carefully analysed in this work. Biomass model compounds are selected aiming to provide an in-depth description of the different processes and stablish solid correlations catalysts composition-catalytic performance which can be further extrapolated to more complex biomass feedstocks. Moreover, the current challenges and research trends of novel hydrodeoxygenation strategies are also presented aiming to spark inspiration among the broad community of scientists working towards a low carbon society where bio-resources will play a major role. Figure 1. Three basic phenylpropane monomers: (1) p-coumaryl alcohol; (2) coniferyl alcohol; (3) sinapyl alcohol.

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Section: Hydrodeoxygenation Using H2mentioning

confidence: 99%

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

et al. 2019

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“…Although Mo 2 C might be less active than noble metals under some reaction conditions, it is indeed more efficient in terms of O-removal with a minimal hydrogen consumption [23], thus intensely increasing the hydrogen efficiency of the HDO process. The supports commonly used for metal carbides include metal oxides (Al 2 O 3, SiO 2 , ZrO 2 ) [18,27,28], zeolites (HZSM-5) [18,23,29], active carbon [25,[30][31][32][33] and bio-char [34].…”

Section: Introductionmentioning

confidence: 99%

Towards a sustainable bio-fuels production from lignocellulosic bio-oils: Influence of operating conditions on the hydrodeoxygenation of guaiacol over a Mo2C/CNF catalyst

Remón

Ochoa

Foguet

et al. 2019

Fuel Processing Technology

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This work firstly provides a thorough insight into the effects of the operating conditions (catalyst loading, initial H 2 pressure temperature, reaction time, H 2 /guaiacol ratio and liquid reaction volume) on the hydrodeoxygenation (HDO) of guaiacol over a Mo 2 C/CNF catalyst. Under the operating condition tested, gas and solid formation was negligible and guaiacol was primary converted to different liquid products, including non-deoxygenated (0-oxy), mono-deoxygenated (1-oxy) and fully deoxygenated (2oxy) compounds, together with high molecular weight soluble oligomers. An increase in the catalyst loading increased the guaiacol conversion and HDO efficiency, augmenting the proportions of HDO products. Among these species, the progressive transformation of 1-oxy compounds into 2-oxy species was kinetically and thermodynamically controlled by the catalyst loading and the amount of H 2 dissolved in the liquid medium, respectively. Augmenting the H 2 pressure increased the H 2 availability in the liquid, which led to increases over time in the guaiacol conversion and HDO efficiency, thus promoting the production of HDO products and facilitating the transformation of guaiacol into fully de-oxygenated products. This increase depended on the reaction volume, with more pronounced variations occurring for a small than for a large volume due to the greater variations occurring in the H 2 /guaiacol ratio for the former than the latter. The temperature exerted a kinetic promoting effect together with a thermodynamic inhibitory influence, as some of the reactions involved were not thermodynamically favoured at high temperature. Therefore, the detailed analysis included in this work brings novel information on guaiacol HDO, which can help to establish the basis for catalysts development and reactors design to achieve a sustainable bio-fuels production from lignocellulosic bio-oils.

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“…Transition metal sulfide (TMS) catalysts are the most critical industrial catalysts used in hydrotreating processes such as hydrodesulfurization and hydrodenitro-genation. NiMo and CoMo are well known to exhibit higher activity than single metal catalysts due to their "synergy effect" 11) ; the "ensemble effect" caused by specific geometry, and the "ligand effect" due to the electronic interaction. Modifications of the mole ratio of Co/(Co＋Mo) by changing the loading amount of Mo for HDO of 4-methylphenol showed the conversion of 4-methyl phenol over all catalysts was close to 100 %, and the selectivity for toluene was 87.9 % over CoMo/ZrO2 (0.30) 12) .…”

Section: Introductionmentioning

confidence: 99%

Roles of Promoter and Support of Sulfided Mo-based Catalyst in Selective Hydrotreating of Palm Fatty Acid Distillate

KIM

KAWANO

Higai

et al. 2022

J. Jpn. Petrol. Inst.

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A series of CoMo/Al2O3 catalysts with various Co/Mo mole ratios and a series of CoMo/TiO2 _ Al2O3 catalysts supported on TiO2 coating Al2O3 were prepared. The effects of Co/Mo mole ratio and TiO2 loadings on Al2O3 on hydrodeoxygenation (HDO) and decarboxylation/decarbonylation (DCO) in the hydrotreating of palm fatty acid distillate (PFAD) were investigated. The catalysts were characterized by BET, XRF, pulse NO chemisorption, and H2-TPR. The maximum yields of n-C16 and n-C18 was observed at Co/Mo＝0.05 for the CoMo/Al2O3 series, and the yield of n-C15 and n-C17 was increased at Co/Mo ＞ 0.05. CoMoS phase apparently has both HDO and DCO activities. CoMo(0.05)/Ti(20) _ Al showed the maximum yields of n-C16 and n-C18 due to the formation of TiMoS in all catalysts. TiMoS phase may be formed by adding TiO2 on Al2O3 and promotes the HDO reaction, but not isomerization or cracking.

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Structure and catalytic activity of CoMo/γ-Al2O3 and CoMo/Sio2 hydrodesulphurization catalysts: an xps and esr characterization of sulfided used catalysts

Cited by 55 publications

References 55 publications

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

Catalytic Upgrading of Biomass Model Compounds: Novel Approaches and Lessons Learnt from Traditional Hydrodeoxygenation – a Review

Towards a sustainable bio-fuels production from lignocellulosic bio-oils: Influence of operating conditions on the hydrodeoxygenation of guaiacol over a Mo2C/CNF catalyst

Roles of Promoter and Support of Sulfided Mo-based Catalyst in Selective Hydrotreating of Palm Fatty Acid Distillate

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