Effect of acidity, hydrogenating phases and texture properties of catalysts on the evolution of asphaltenes structures during reside hydroconversion

Magendie, Guillaume; Guichard, Bertrand; Espinat, D.

doi:10.1016/j.cattod.2014.10.023

Cited by 13 publications

(10 citation statements)

References 62 publications

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“…FTIR spectra of the δ‐Al 2 O 3 support and Pdop/δ‐Al 2 O 3 , obtained by impregnating the carrier with 1.4/6.4/13/19 wt% of dopamine‐hydrochloride, are shown in Figure . Infrared bands due to stretching vibrations of surface OH groups are present on bare δ‐Al 2 O 3 between 3650 and 3800 cm ‐1 . Those signals start to disappear with increasing Pdop loading, and above 6.4 wt% of Pdop loading most of the free OH groups are not visible anymore (Figure S1).…”

Section: Resultsmentioning

confidence: 99%

Efficient CoMoS Catalysts Supported on Bio‐Inspired Polymer Coated Alumina for Hydrotreating Reactions

et al. 2017

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Organic additives are widely used in order to improve the performance of hydrotreating catalysts. Yet, the use of polymers, in particular bio‐polymers, is less widespread. We present, herein, a strategy to coat alumina support with a bio‐polymer, namely polydopamine (Pdop). The Pdop coated supports provide a higher number of adsorption sites for Mo species compared to the bare support. The hydrotreating catalyst prepared on Pdop coated support showed improved performances for various hydrotreating reactions (aromatic hydrogenation, gas‐oil HDS and HDN). The increase in activity is ascribed to a better accessibility of active sites, and the presence of carbon adlayer between the active phase and alumina limiting detrimental direct metal support interactions. Modification of the alumina surfaces by Pdop creates new adsorption sites for metallic precursors, thereby allowing an improved accessibility of active sites especially at high surface densities.

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Section: Resultsmentioning

confidence: 99%

Efficient CoMoS Catalysts Supported on Bio‐Inspired Polymer Coated Alumina for Hydrotreating Reactions

et al. 2017

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“…This is even more necessary concerning fixed bed residue hydrotreating units where pressure drop is one of the first criteria to be taken into account. As a consequence, the catalytic activity is often related to the support effects and indirectly to a more specific active phase provided by metal sulphides [20,21]. An active field of investigation aims to elucidate the cause of this deactivation which is still a challenge for catalyst manufacturers Afterwards, many works were launched in the literature about the characterization of transport properties of different size molecules through the catalytic porous network, but with rather few papers assessing the fundamental diffusion aspects and the catalytic operation of materials.…”

Section: Introductionmentioning

confidence: 99%

Asphaltenes diffusion/adsorption through catalyst alumina supports – Influence on catalytic activity

et al. 2018

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Click here to view linked References might be likely to adsorb till its chemical saturation, i.e. an asphaltene content equal to 1.4 mg/m 2 consistent with previous publications for those species. As a consequence, NiMoP-B14 is the best catalyst for all the reactions reaching 50% of gain for HDAsC7 and 40% in HDV. It highlights a clear link is established between catalytic performances and diffusion and could be usefull for designing the best carriers to be used in heavy feed hydrporocessing.

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“…[8] Whatever the preparation method, it is expected that the fine tuning of the promoter (Ni, Co) to metal (W, Mo) ratio should provide optimized activities. [8][9][10][11][12] According to density functional theory (DFT) studies, [10,13,14] modifying the promoter/Mo(W) ratio provides various structural configurations of the active sites located at the "M-edge" or "S-edge" of the NiMoS or NiWS nanocrystallites. However, quantitative structure-activity relationship between the Ni promoter edge location in each NiW(Mo)S nano-crystallite and the resulting intrinsic activity is still a challenging task.…”

Section: Introductionmentioning

confidence: 99%

Improved promoter effect in NiWS catalysts through a molecular approach and an optimized Ni edge decoration

Alphazan

Bonduelle‐Skrzypczak

Legens

et al. 2016

Journal of Catalysis

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An efficient preparation method -based on the grafting and deposition of Ni and W molecular precursors onto partially dehydroxylated amorphous silica-alumina followed by a thermal treatment under H 2 S/H 2 -generates supported NiWS catalysts exhibiting enhanced activities in toluene hydrogenation, by comparison with conventional samples, prepared from metallic salts. A careful analysis of these materials by IR, XPS, TEM, HAADF-STEM, together with DFT calculations, reveals that the improved activity probably originates from the lower sulfidation temperature of W that improves distribution of Ni-W mixed sites at the edges of NiWS crystallites, thus providing an optimal compromise between intrinsic activity and surface concentration of active sites.

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Effect of acidity, hydrogenating phases and texture properties of catalysts on the evolution of asphaltenes structures during reside hydroconversion

Cited by 13 publications

References 62 publications

Efficient CoMoS Catalysts Supported on Bio‐Inspired Polymer Coated Alumina for Hydrotreating Reactions

Efficient CoMoS Catalysts Supported on Bio‐Inspired Polymer Coated Alumina for Hydrotreating Reactions

Asphaltenes diffusion/adsorption through catalyst alumina supports – Influence on catalytic activity

Improved promoter effect in NiWS catalysts through a molecular approach and an optimized Ni edge decoration

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