Can Mesoporous TiO2-Al2O3-Supported NiMoS OR CoMoS Effectively Perform in Ultra-Deep Desulfurization of Gas Oil?

Shalaby, Nasser H.; Hanafi, Samia A.; Hassan, Salah A.; Elmelawy, Mamdouh S.

doi:10.1134/s0965544118050158

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…The said mixture was designed similarly to the mixed feedstock processed in a Chinese refinery HDS unit for ULSD production (12 400 ppm S and 442.5 ppm N), and the authors also tested the NiMo/CoMo configuration in the said industrial unit under 8.15 MPa of hydrogen partial pressure, 1.4 h −1 LHSV, and 361.6 °C average operating conditions. These laboratory and industrial-scale results are depicted in Table 4 and demonstrate that the NiMo/CoMo dual-bed catalytic configuration of bifunctional catalysts with a Brønsted 86 In the said study, the main objective was to produce NiMo and CoMo-supported catalysts on the TiO 2 −Al 2 O 3 mesoporous matrix prepared from waste aluminum foil. However, the synthesized catalysts failed to produce ULSD in single-bed systems, even under severe operating conditions (T = 400 °C, LHSV = 0.5 h −1 , and P H 2 = 6 MPa).…”

Section: Research Studies and Innovations Onmentioning

confidence: 86%

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Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

2022

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Production of ultralow sulfur diesel (ULSD) is a tough challenge for refineries previously producing low sulfur diesel. Some common solutions to meet the stricter standards are revamping pre-existing units, building new facilities, purchasing high-activity catalysts, adapting alternative desulfurization techniques, and changing the feedstock; however, these methods usually entail high capital investments or are simply not viable. Another option, generally overlooked, is to place different catalysts in multibed configurations to produce a synergistic effect between them, i.e., catalyst stacking technology. This work aims to broaden the current knowledge and scope of this technology and suggest it as a viable low-investment solution for ULSD production. As we have described, the differences between the catalysts can be exploited to maximize the performance and minimize the operating costs of HDS units. Moreover, any new HDS catalyst performance could benefit from a fitting stacked-bed system, especially if it has high production costs. However, the synergistic effect between the catalysts is not fully understood yet, and designing the best stacking system (number, order, and proportions of the catalysts) is not straightforward. Many factors must be considered, such as the characteristics of the catalysts (active phase, support, and kinetic parameters), feedstock composition, operating constraints, and target end product. Currently, the selection of the optimal configuration is inadequately approached case by case and requires multiple catalytic evaluations on an industrially relevant scale because a reliable predictive method has not been established yet. Therefore, valuable time and resources could be saved by thoroughly studying the influences of the variables on the synergetic effects and developing new mathematical models. Furthermore, there are still many alternative applications of this technology that could solve current and future issues of the refining industry, like the reuse of spent catalysts and the coprocessing of bio-oils with conventional feedstocks.

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Section: Research Studies and Innovations Onmentioning

confidence: 86%

“…Yet another example of the synergy resulting from dual-bed catalytic configurations was documented by Shalaby et al in 2018 . In the said study, the main objective was to produce NiMo and CoMo-supported catalysts on the TiO 2 –Al 2 O 3 mesoporous matrix prepared from waste aluminum foil.…”

Section: Research Studies and Innovations On Catalyst Stacking Optimi...mentioning

confidence: 99%

Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

2022

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“…Deep desulfurization of sintering flue gas based on lowtemperature oxidation is a new technology developed on the basis of catalytic oxidation desulfurization. Its main principle is to add absorbent [11,12] in the liquid phase, in the presence of oxygen, oxidize sulfur dioxide to sulfuric acid, nitric oxide to nitrogen dioxide, and obtain compound fertilizer of ammonium sulfate and ammonium nitrate in the alkaline condition. At present, the most studied absorbents are transition metal ions such as iron, manganese, and sodium, and organic compounds such as ethylenediamine cobalt [13,14].…”

Section: Principle Of Flue Gas Desulfurizationmentioning

confidence: 99%

Deep desulfurization of sintering flue gas in iron and steel works based on low-temperature oxidation

Hua

2020

Open Chemistry

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The deep desulfurization method of sintering flue gas based on the low-temperature oxidation method is studied. Based on the analysis of the main principle of deep desulfurization of sintering flue gas, a deep desulfurization system of sintering flue gas is constructed, which is composed of an absorption washing unit and a washing solution treatment unit. Sodium hydroxide solution is used as the desulfurizing absorbent to mix with the sintering flue gas entering the reaction tower. Sulfur dioxide in the sintering flue gas reacts with sodium hydroxide to generate sodium sulfite, and sodium sulfite is oxidized to produce sodium sulfate; ozone is produced by ozone generator, nitrogen oxide compounds are oxidized by ozone to generate oxyacid, which is easy to be removed by sodium hydroxide washing solution, and the detergent is the same as that used to remove sulfur dioxide and dust. The experimental results show that the highest desulfurization rate and denitrification rate of the proposed method are 90% and over 22%, and the reaction efficiency and economy are significantly better than that of the comparative method, which shows that the method is reasonable and effective.

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“…22 Starch was used as a template to prepare a composite catalyst for hydrodesulfurization of straight-run diesel. 23 The results of structural analysis showed that the introduction of starch can significantly increase the pore volume of the support, which is helpful for the catalytic reaction. A novel catalyst for catalytic hydrogenation of liquid-phase nitroaromatics was synthesized using starch modification, 24 and it exhibited good catalytic activity and stability due to the highly dispersed Ag nanoparticles and the strong interaction between the active metal and the support.…”

Section: Introductionmentioning

confidence: 99%

“…25 The characterization results proved that starch could inhibit the decomposition of silanol groups on the surface of the support, and the silanol groups are conducive to the dispersion of Cu species. Previous studies have showed that the introduction of starch is likely to facilitate increasing the pore volume of the catalyst support, 23,26 strengthening the metal-support interactions 24 (MSI) and increasing the active sites. 27 In this work, starch was applied to modify the AC and new catalysts were synthesized (Scheme 1).…”

Section: Introductionmentioning

confidence: 99%

Efficient and stable catalysts for the synthesis of dimethyl carbonate by carbonylation of methyl nitrite applying the starch-coated activated carbon as a support

et al. 2023

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Can Mesoporous TiO2-Al2O3-Supported NiMoS OR CoMoS Effectively Perform in Ultra-Deep Desulfurization of Gas Oil?

Cited by 5 publications

References 27 publications

Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

Catalyst Stacking Technology as a Viable Solution to Ultralow Sulfur Diesel Production

Deep desulfurization of sintering flue gas in iron and steel works based on low-temperature oxidation

Efficient and stable catalysts for the synthesis of dimethyl carbonate by carbonylation of methyl nitrite applying the starch-coated activated carbon as a support

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