Hydrotreating Catalysis

Topsøe, Henrik; Clausen, Bjerne S.; Massoth, F.E.

doi:10.1007/978-3-642-61040-0_1

Cited by 797 publications

(1,095 citation statements)

References 1,085 publications

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“…Studies on the characterization of hydroprocessing catalysts have been recently reviewed in detail. 39 The catalyst used in the present study, which is typical of these catalysts, consists of multiple slabs of MoS 2 with adjoining Co atoms supported on the alumina surface. The slabs are believed to be mostly of hexagonal shape.…”

Section: Discussionmentioning

confidence: 99%

“…Under our reaction conditions, the H 2 S/H 2 ratio was 0.0027, which corresponds to Sun's et al description of about half of the Mo edge covered by S or SH and half containing about one vacancy per five S. These findings, based mainly on DFT calculations, seem to confirm earlier speculations relative to the presence of vacancies. 39 The Mo-edge has been proposed to be active for the HYD reactions 44 while S vacancy sites may be favorable for adsorption through a heteroatom leading, for example, to hydrogenolysis.…”

Section: Discussionmentioning

confidence: 99%

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Catalytic Hydrodeoxygenation of Methyl-Substituted Phenols: Correlations of Kinetic Parameters with Molecular Properties

et al. 2006

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The hydrodeoxygenation of methyl-substituted phenols was carried out in a flow microreactor at 300°C and 2.85 MPa hydrogen pressure over a sulfided CoMo/Al 2 O 3 catalyst. The primary reaction products were methylsubstituted benzene, cyclohexene, cyclohexane, and H 2 O. Analysis of the results suggests that two independent reaction paths are operative, one leading to aromatics and the other to partially or completely hydrogenated cyclohexanes. The reaction data were analyzed using Langmuir-Hinshelwood kinetics to extract the values of the reactant-to-catalyst adsorption constant and of the rate constants characterizing the two reaction paths. The adsorption constant was found to be the same for both reactions, suggesting that a single catalytic site center is operative in both reactions. Ab initio electronic structure calculations were used to evaluate the electrostatic potentials and valence orbital ionization potentials for all of the substituted phenol reactants. Correlations were observed between (a) the adsorption constant and the two reaction rate constants measured for various methyl-substitutions and (b) certain moments of the electrostatic potentials and certain orbitals' ionization potentials of the isolated phenol molecules. On the basis of these correlations to intrinsic reactantmolecule properties, a reaction mechanism is proposed for each pathway, and it is suggested that the dependencies of adsorption and reaction rates upon methyl-group substitution are a result of the substituents' effects on the electrostatic potential and orbitals rather than geometric (steric) effects.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Catalytic Hydrodeoxygenation of Methyl-Substituted Phenols: Correlations of Kinetic Parameters with Molecular Properties

et al. 2006

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“…Standard industrial HDT catalysts are composed of molybdenum sulphide (or tungsten sulphide) phase-promoted by cobalt or nickel and are usually supported on alumina. 21 Other important HDS catalysts are metal carbides (e.g. Mo 2 C) and more recently metal phosphides (i.e.…”

Section: Hydrotreatingmentioning

confidence: 99%

Nanostructured hydrotreating catalysts for electrochemical hydrogen evolution

2014

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Progress in catalysis is driven by society's needs. The development of new electrocatalysts to make renewable and clean fuels from abundant and easily accessible resources is among the most challenging and demanding tasks for today's scientist and engineers. The electrochemical splitting of water into hydrogen and oxygen has been known for over 200 years, but in the last decade and motivated by the perspective of solar hydrogen production, new catalysts made of earth-abundant materials have emerged. Here we present an overview of recent developments of the non-noble metal catalysts for electrochemical hydrogen evolution reaction (HER). Emphasis is given to the nanostructuring of industrially relevant hydrotreating catalysts as potential HER electrocatalysts. The new syntheses and nanostructuring approaches might pave the way to future developments of highly efficient catalysts for energy conversion.

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“…HDT reactions are intended to improve the properties of the processed feed and make the final properties meet very strict specifications, through removal of heteroatoms during hydrodesulfurization (HDS), hydrodenitrogenation (HDN) and hydrodemetalation reactions, and reduction of the aromatic and olefin contents through hydrogenation (Topsoe et al, 1996). HDT can also be used as a pretreatment stage in other processes, in order to protect expensive and/or very sensitive catalysts from specific contaminants.…”

Section: Introductionmentioning

confidence: 99%

“…The oil fractions used as feeds in HDT processes can be very different, ranging from naphtha to heavy vacuum gasoil (Topsoe et al, 1996). The most common feeds used in Brazilian refineries have a distillation range that is similar to the distillation range of diesel and are known as middle distillates.…”

Section: Introductionmentioning

confidence: 99%

In-line estimation of sulfur and nitrogen contents during hydrotreating of middle distillates

Pacheco

Salim

Pinto

2009

Braz. J. Chem. Eng.

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-The main objective of this work is analyzing whether it is possible to develop an empirical correlation for in-line estimation of the sulfur and nitrogen contents of the middle distillates Hydrotreating (HDT) products for control purposes. Correlations are based only on readily available in-line information of specific gravity variation between feedstock and products, without considering any piece of information about the kinetic behavior of the catalyst. Experimental data were obtained in pilot plants under operating conditions that are representative of refinery operations. Results indicate that the removal of nitrogen and sulfur compounds during middle distillates HDT can be monitored in-line in real time, based on the available measurements of specific gravity. This allows for development and implementation of advanced in-line procedures for monitoring and control of the HDT process in real time.

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Hydrotreating Catalysis

Cited by 797 publications

References 1,085 publications

Catalytic Hydrodeoxygenation of Methyl-Substituted Phenols: Correlations of Kinetic Parameters with Molecular Properties

Catalytic Hydrodeoxygenation of Methyl-Substituted Phenols: Correlations of Kinetic Parameters with Molecular Properties

Nanostructured hydrotreating catalysts for electrochemical hydrogen evolution

In-line estimation of sulfur and nitrogen contents during hydrotreating of middle distillates

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