Comprehensive investigation of the effect of adding phosphorus and/or boron to NiMo/γ-Al2O3 catalyst in diesel fuel hydrotreating

Soltanali, Saeed; Mashayekhi, Maryam; Mohaddecy, Seyed Reza Seif

doi:10.1016/j.psep.2020.02.033

Cited by 20 publications

(11 citation statements)

References 50 publications

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“…It has been reported in the literature that certain elements in the structure of activated carbon can provide specific characteristics when used as a HDS catalyst support . Elemental analysis results using a set of XRF tests on the prepared activated carbon samples are shown in Table .…”

Section: Resultsmentioning

confidence: 99%

Effectiveness Study of Mesoporous Size, Acidity, and Precursor Type on Characterization of Activated Carbon as an Fe–Mo Catalyst Support for Hydrodesulfurization of Heavy Naphtha

Soleymani

Karimzadeh

Rashidi³

et al. 2023

Ind. Eng. Chem. Res.

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The main goal of this research is to evaluate the effects of various parameters on the synthesis of a Fe−Mo catalyst supported on an in-house developed mesoporous activated carbon. For this purpose, mesoporous carbon has been prepared from grape branches and oil palm trunks under various activation times and drying periods. Consequently, optimum values of the aforementioned parameters have been obtained in order to synthesize an efficient support for developing a heavy naphtha hydrodesulfurization (HDS) catalyst. Subsequently, a mixture of Fe−Mo with a weight ratio of 1:3 has been loaded on the developed supports through a wet impregnation method. Various experimental analyses including X-ray diffraction (XRD), Fourier transform infrared (FTIR), Brunauer−Emmett−Teller (BET), temperature programmed desorption (TPD), temperature programmed reduction (TPR), field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence (XRF), thermogravimetric analysis (TGA), and energy dispersive X-ray (EDX) have been undertaken to determine the characteristics of synthetic catalysts and activated carbons. Once an appropriate catalyst has been synthesized on the basis of the experimental analyses, its performance for hydrodesulfurization of heavy naphtha has been investigated and has been compared to the efficiency of a catalyst with a commercial activated carbon support. The obtained results reveal that the sulfur conversions of heavy naphtha containing 900 ppm sulfur compounds at atmospheric pressure and at 340 °C are around 78 and 55% for the desulfurization process using the synthesized catalyst in the present work and the used commercial catalyst, respectively. It has also been found that a combination of grape branches and oil palm trunks contributes to an efficient mesoporous carbon structure, an acceptable thermal stability, and the development of a cost-effective support for the synthesis of an industrially viable HDS catalyst.

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Section: Resultsmentioning

confidence: 99%

Effectiveness Study of Mesoporous Size, Acidity, and Precursor Type on Characterization of Activated Carbon as an Fe–Mo Catalyst Support for Hydrodesulfurization of Heavy Naphtha

Soleymani

Karimzadeh

Rashidi³

et al. 2023

Ind. Eng. Chem. Res.

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“…The acidity of the catalyst helps sterrically hindered refractory compounds to access the active sites. When Soltanani et al (Soltanali et al, 2020) used (Poulet et al, 1993;Jian and Prins, 1998;Maity et al, 2008;Rayo et al, 2012;Rashidi et al, 2013;Soltanali et al, 2020). The same properites can also be obtained using boron; increasing dispersion of the active phase, modifying the acidity of the support and reducing metal-support interaction.…”

Section: The Use Of Additivesmentioning

confidence: 97%

“…The addition of additives such as boron and phosphsorus also greatly improves the catalytic activity of conventional HDS and HDN catalysts (Table 1) (Rashidi et al, 2013;Vatutina et al, 2019;Soltanali et al, 2020). The addition of boron or phosphorous helps improve the acidity of the catalyst and the dispersion of the active phase.…”

Section: The Use Of Additivesmentioning

confidence: 99%

Perspectives on strategies for improving ultra-deep desulfurization of liquid fuels through hydrotreatment: Catalyst improvement and feedstock pre-treatment

et al. 2022

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Reliance on crude oil remains high while the transition to green and renewable sources of fuel is still slow. Developing and strengthening strategies for reducing sulfur emissions from crude oil is therefore imperative and makes it possible to sustainably meet stringent regulatory sulfur level legislations in end-user liquid fuels (mostly less than 10 ppm). The burden of achieving these ultra-low sulfur levels has been passed to fuel refiners who are battling to achieve ultra-deep desulfurization through conventional hydroprocessing technologies. Removal of refractory sulfur-containing compounds has been cited as the main challenge due to several limitations with the current hydroprocessing catalysts. The inhibitory effects of nitrogen-containing compounds (especially the basic ones) is one of the major concerns. Several advances have been made to develop better strategies for achieving ultra-deep desulfurization and these include: improving hydroprocessing infrastructure, improving hydroprocessing catalysts, having additional steps for removing refractory sulfur-containing compounds and improving the quality of feedstocks. Herein, we provide perspectives that emphasize the importance of further developing hydroprocessing catalysts and pre-treating feedstocks to remove nitrogen-containing compounds prior to hydroprocessing as promising strategies for sustainably achieving ultra-deep hydroprocessing.

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“…Hydrodesulfurization (HDS) is the most commonly used technology to produce clean fuels by employing hydrotreating catalysts, mainly from Co(Ni)/Mo oxides supported on alumina [3][4][5][6][7][8][9][10][11]. The production of ultra-low fuels using the HDS process at present requires extreme and expensive operating conditions, viz., high temperatures, hydrogen and highly active catalysts.…”

Section: Introductionmentioning

confidence: 99%

Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS2 in the Hydrodesulfurization of Dibenzothiophene

2021

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Hydrodesulfurization (HDS) is a widely used process currently employed in petroleum refineries to eliminate organosulfur compounds in fuels. The current hydrotreating process struggles to remove organosulfur compounds with a steric hindrance due to the electronic nature of the current catalysts employed. In this work, the effects of adding chelating ligands such as ethylenediaminetetraacetic acid (EDTA), citric acid (CA) and acetic acid (AA) to rhodium (Rh) and active molybdenum (Mo) species for dibenzothiophene (DBT) HDS catalytic activity was evaluated. HDS activities followed the order of RhMo/ɣ-Al2O3 (88%) > RhMo-AA/ɣ-Al2O3 (73%) > RhMo-CA/ɣ-Al2O3 (72%) > RhMo-EDTA/ɣ-Al2O3 (68%). The observed trend was attributed to the different chelating ligands with varying electronic properties, thus influencing the metal–support interaction and the favorable reduction of the Mo species. RhMo/ɣ-Al2O3 offered the highest HDS activity due to its (i) lower metal–support interaction energy, as observed from the RhMo/ɣ-Al2O3 band gap of 3.779 eV and the slight shift toward the lower BE of Mo 3d, (ii) increased Mo-O-Mo species (NMo-O-Mo ~1.975) and (iii) better sulfidation of Rh and MoO in RhMo/ɣ-Al2O3 compared to the chelated catalysts. The obtained data provides that HDS catalytic activity was mainly driven by the structural nature of the RhMo-based catalyst, which influences the formation of more active sites that can enhance the HDS activity.

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Comprehensive investigation of the effect of adding phosphorus and/or boron to NiMo/γ-Al2O3 catalyst in diesel fuel hydrotreating

Cited by 20 publications

References 50 publications

Effectiveness Study of Mesoporous Size, Acidity, and Precursor Type on Characterization of Activated Carbon as an Fe–Mo Catalyst Support for Hydrodesulfurization of Heavy Naphtha

Effectiveness Study of Mesoporous Size, Acidity, and Precursor Type on Characterization of Activated Carbon as an Fe–Mo Catalyst Support for Hydrodesulfurization of Heavy Naphtha

Perspectives on strategies for improving ultra-deep desulfurization of liquid fuels through hydrotreatment: Catalyst improvement and feedstock pre-treatment

Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS2 in the Hydrodesulfurization of Dibenzothiophene

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