Catalytic performance of CoMo/Al2O3-MgO-Li(x) formulations in DBT hydrodesulfurization

Solís-Casados, Dora Alicia; Escobar‐Alarcón, L.; Klimova, Tatiana; Escobar-Aguilar, J.; Rodríguez‐Castellón, Enrique; Cecilia, Juan Antonio; Morales-Ramírez, C.

doi:10.1016/j.cattod.2015.07.046

Cited by 28 publications

(30 citation statements)

References 37 publications

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“…This confirmed the contribution of support basicity on the DDS selectivity of corresponding catalyst. Accordingly, the incorporation of first group elements, e.g., Li, Na, and K, into hydrodesulfurization catalyst could increase their DDS selectivity [24][25][26][27][28][29][30][31][32]. To date, most related researches were performed on some typical support materials, e.g., r-Al 2 O 3 , SiO 2 and so on [25,27,28].…”

Section: Introductionmentioning

confidence: 99%

Complete Hydrodesulfurization of Dibenzothiophene via Direct Desulfurization Pathway over Mesoporous TiO2-Supported NiMo Catalyst Incorporated with Potassium

Song²,

Yue

et al. 2019

Catalysts

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Mesoporous TiO2 containing different potassium content was prepared from potassium titanate by mediating the pH value of the ion exchange, which was used as catalytic support to load NiMo for hydrodesulfurization of dibenzothiophene. The as-prepared samples were characterized by X-ray diffraction, N2 physical adsorption/desorption, temperature-programmed reduction, scanning electron microscope/energy dispersive X-ray mapping analysis, high resolution transmission electron microscopy, and pyridine-adsorbed Fourier transform infrared spectroscopy. The characterization results showed that NiO and MoO3 were well dispersed on mesoporous TiO2 with varying potassium content. A crystal NiMoO4 phase was formed on the TiO2 with relatively high potassium content, which could decrease the reduction temperature of oxidized active species. The evaluation results from the hydrodesulfurization displayed that as the potassium content of the catalyst increased, the dibenzothiophene conversion firstly increased and then slightly decreased when potassium content exceeded 6.41 wt %. By contrast, the direct desulfurization selectivity could continuously increase along with the potassium content of catalyst. Furthermore, the change in direct desulfurization selectivity of a TiO2-supported NiMo catalyst was independent of the reaction condition. The mesoporous TiO2-supported NiMo catalyst incorporated with potassium could have near both 100% of dibenzothiophene and 100% of direct desulfurization selectivity. According to the structure–performance relationship discussion, the incorporation of potassium species could benefit the formation of more sulfided active species on mesoporous TiO2. Moreover, excessive free potassium species may poison the active sites of the hydrogenation pathway. Both factors determined the characteristics of complete hydrodesulfurization of dibenzothiophene via a direct desulfurization pathway for potassium-incorporated mesoporous TiO2 supported NiMo catalysts.

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Section: Introductionmentioning

confidence: 99%

Complete Hydrodesulfurization of Dibenzothiophene via Direct Desulfurization Pathway over Mesoporous TiO2-Supported NiMo Catalyst Incorporated with Potassium

Song²,

Yue

et al. 2019

Catalysts

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“…It was observed that the values of the tetrahedral/octahedral Mo ratio increase with increasing lithium content. The authors suggest that Li favours a change from octahedral to tetrahedral Mo species . The presence of supported cobalt with tetrahedral symmetry (CoAl 2 O 4 ) was also found by the diffuse reflectance spectroscopy method.…”

Section: Introductionmentioning

confidence: 86%

“…The activity of the Co,Mo/Al 2 O 3 ‐MgO−Li( x ) catalyst in the reaction of dibenzothiophene hydrodesulphurization increases with increasing lithium content in the samples (optimum lithium content is equal to 3.7 at%) . The catalyst demonstrates low activity when the lithium oxide concentration is 1.0 % and 10 %.…”

Section: Introductionmentioning

confidence: 98%

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Thermodynamic Calculations to Determine the Optimal Composition of Oxide Catalysts

et al. 2018

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Thermodynamic calculations of the optimal compositions of oxide catalysts with different natures are performed based on the theory of catalysis by polyhedra. The obtained compositions of the active catalysts agree with experimental data. The electrostatic potential generated by polyhedra of metal-oxide catalysts in a variety of directions is calculated. The dependence of the sign and magnitude of the potential on the distance from the central metal ion towards the vertex of the polyhedron, the middle of its edge or the centre of the face is estimated. It is assumed that the magnitude of the potential can serve as a reference point for determining active centres, which produce adsorption complexes and intermediate compounds.

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“…At present, the reduction of environmental issues induced by the emissions of SO x into the environment requires high-quality ultra-low sulphur transportation fuels. To this end, the hydrotreatment processes making use of more active and selective catalysts have been proposed [45].…”

Section: Ecological Restrictions On Quality Characteristics Of Oilsmentioning

confidence: 99%

Sustainable development and enhancement of cracking processes using metallic composites

et al. 2021

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Metallic composites represent a vital class of materials that has gained increased attention in crude oil processing as well as the production of biofuel from other sources in recent times. Several catalytic materials have been reported in the literature for catalytic cracking, particularly, of crude oil. This review seeks to provide a comprehensive overview of existing and emerging methods/technologies such as metal–organic frameworks (MOFs), metal–matrix composites (MMCs), and catalytic support materials, to bridge information gaps toward sustainable advancement in catalysis for petrochemical processes. There is an increase in industrial and environmental concern emanating from the sulphur levels of oils, hence the need to develop more efficient catalysts in the hydrotreatment (HDS and HDN) processes, and combating the challenge of catalyst poisoning and deactivation; in a bid to improving the overall quality of oils and sustainable use of catalyst. Structural improvement, high thermal stability, enhanced cracking potential, and environmental sustainability represent the various benefits accrued to the use of metallic composites as opposed to conventional catalysts employed in catalytic cracking processes.

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Catalytic performance of CoMo/Al2O3-MgO-Li(x) formulations in DBT hydrodesulfurization

Cited by 28 publications

References 37 publications

Complete Hydrodesulfurization of Dibenzothiophene via Direct Desulfurization Pathway over Mesoporous TiO2-Supported NiMo Catalyst Incorporated with Potassium

Complete Hydrodesulfurization of Dibenzothiophene via Direct Desulfurization Pathway over Mesoporous TiO2-Supported NiMo Catalyst Incorporated with Potassium

Thermodynamic Calculations to Determine the Optimal Composition of Oxide Catalysts

Sustainable development and enhancement of cracking processes using metallic composites

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