Effect of the noncylindrical shape of extrudates on the hydrodesulfurization of oil fractions

Bruijn, A. de Frank; Naka, Itaru.; Sonnemans, J.W.M.

doi:10.1021/i200012a005

Cited by 29 publications

(18 citation statements)

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“…It is well-known that the pressure drop in the catalyst bed is related to length, diameter, shape, and bed porosity and that non-cylindrical particles exhibit lower pressure drop than others due to their higher bed porosity [2]. To demonstrate this, the effect of the different particle shapes on pressure drop was studied at constant operating conditions by varying the particle size (V p /S p ratio).…”

Section: Pressure Dropmentioning

confidence: 99%

“…This is the reason why catalyst strength requirements are intended to prevent pressure drop increase due to breakage. In this sense, poly-lobe particles have an acceptable strength and hence are more recommended [2].…”

Section: Pressure Dropmentioning

confidence: 99%

“…On the other hand large particles often have low activity and cause low pressure drop. Therefore, a good selection of particle size and shape has to be made depending on the type of feedstock and operating conditions in order to optimize catalyst behavior [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…of catalytic particles on HDS catalyst behavior have been reported in the literature [1][2][3][4][5][6]. Very nice and deep discussions have been made in order to correlate catalyst shape and size, particle size distribution, catalyst bulk density, catalyst pretreatment, diluent size, loading techniques, etc.…”

Section: Introductionmentioning

confidence: 99%

“…de Bruijn et al [2] presented an investigation of the effects of non-cylindrical shape of extrudates on the HDS of oil fractions, and reported that for a particle volume identical with that of cylindrical extrudates, non-cylindrical www.elsevier.com/locate/cattod Catalysis Today 98 (2004) [243][244][245][246][247][248][249][250][251][252] extrudates may lead to an activity which is higher than that of the cylindrical ones, depending on the degree of diffusion limitation.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of an isothermal hydrodesulfurization small reactor with different catalyst particle shapes

Macias

Ancheyta

2004

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Section: Pressure Dropmentioning

confidence: 99%

Section: Pressure Dropmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of an isothermal hydrodesulfurization small reactor with different catalyst particle shapes

Macias

Ancheyta

2004

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Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Taralas

1998

Can J Chem Eng

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At a total pressure of 101.3 kPa, and in the presence of water vapor (PH20 = 32 Ha), the impact of commercially available Norwegian and Swedish quarried mineral rocks on the gaseous product yields and selectivities generated during the catalytic steam pyrolysis of n-heptane (Pn-C7H,6 = 2.9-4.7 kPa) in the intermediate temperature range of 973-1073 K and GHSV 1200-4000 h-' was investigated. The results indicate that the choice of calcined mineral particles as the bed material influences the product distribution of alkenes. In particular, calcined dolomites [CaMg(0)2] suppressed the evolution of unsaturated and aromatic hydrocarbon species; however, the formation of ethylene (C2H4) was correlated. A LangmuirHinshelwood mechanism has also been proposed to describe the rate equation of the vapor-phase steam pyrolysis of nheptane on calcined dolomite at 973 K.On a etudie, a une pression totale de 101,3 kPa et en presence de vapeur d'eau ( P H~~ = 32 kPa), l'impact de roches minerales de carrieres norvegiennes et suedoises, sur les rendements de produits gazeux et les selectivites generees au cours de la pyrolyse a la vapeur catalytique du n-heptane (P.-c-~,~ = 2,9-4,7 kPa) dans la gamme de temperatures intermediaires de 973-1073 K et un GHSV de 1200-1400 h-'. Les resultats indiquent que le choix de particules minerales calcinees comme materiau de lit influence la distribution de produits des alcenes. En particulier, les dolomites calcinees [CaMg(0)2] suppriment I'evolution d'especes d'hydrocarbures aromatiques et non satures; toutefois, la formation d'ethylene (C2H4) a ete correlee. On propose egalement un mecanisme de Langmuir-Hinshelwood pour decrire l'equation de vitesse de la pyrolyse a la vapeur du n-heptane en phase vapeur sur la dolomite calcinee a 973 K.Keywords: calcined dolomite, CaO, limestone, MgO, steam pyrolysis, n-heptane. evelopment of thermal gasification technologies has D enabled a significant increase of the utilization of biomass (foresty and agricultural residues) including municipal solid waste or parts of it, RDF, and desified digested sewage sludges in energy production (Nilsson, 1995). Thermal gasification of biomass produces permanent gas ( e g , H,, CO, CO,, CH,) which is withdrawn from the gasification reactorzone and subjected to a cleaning operation to rid the flue gas of various contaminants (tar, VOC, particulates in the form of carbon, dust, ash, alkali trace metals, etc). Tar mitigation in the flue gas has been one of the key processes in biomass gasification in the last 20 years due to plugging of downstream equipment from tar condensation (Taralas, 1988;Taralas and Koukios, 1996). The basic idea in processing tm elimination is to benefit from the chemical energy of the he1 gas that includes the tar conversion into H2, CH, and lighter hydrocarbons (Sjostrom et al., 1988; Rensfelt and Ekstrom, 1989).There exists a significant amount of literature on tar cracking and sulphur absorption on dolomite and related carbonate mineral materials practicing gasification engineering of fossil (...

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Catalyst particle shapes and pore structure engineering for hydrodesulfurization and hydrodenitrogenation reactions

Shi

Zhao

Yang

et al. 2022

Front. Chem. Sci. Eng.

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Effect of the noncylindrical shape of extrudates on the hydrodesulfurization of oil fractions

Cited by 29 publications

References 1 publication

Simulation of an isothermal hydrodesulfurization small reactor with different catalyst particle shapes

Simulation of an isothermal hydrodesulfurization small reactor with different catalyst particle shapes

Catalytic steam pyrolysis of a selected saturated hydrocarbon on calcined mineral particles

Catalyst particle shapes and pore structure engineering for hydrodesulfurization and hydrodenitrogenation reactions

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