Deep insights into enhanced direct-desulfurization selectivity of thiourea-modified CoMoP/γ-Al2O3: An investigation of catalyst microstructures

Wang, Shen; Zhang, Jingcheng; Liú, Dan; Nan, Jun; Sun, Yahui; Gui, Jianzhou; Yu, Haibin

doi:10.1016/j.fuel.2019.116993

Cited by 10 publications

(6 citation statements)

References 31 publications

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“…According to refs, 20,40,41 the apparent signals at 1446, 1492, 1575, and 1622 cm −1 are attributed to the Lewis acid, while the signal appearing at 1546 cm −1 is ascribed to the existence of the Brønsted acid. 42,43 Moreover, the peak areas shown in Figure 3A indicate that most of the total acidities are attributed to Lewis acid sites, which can also be confirmed by the statistical results obtained at 200 °C as shown in Table 2.…”

Section: Resultssupporting

confidence: 73%

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

et al. 2020

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A series of mesoporous materials of SBA-16 were in situ incorporated into ZSM-5 crystallites via a two-step self-assemble method, and hydrodesulfurization (HDS) catalysts were prepared on the corresponding ZSM-5/SBA-16 (ZS) composites. The characterization results indicated that ZSM-5 nanoseeds were fabricated into the silica framework of the ZS composites, and the three-dimensional Im3m cubic structure of SBA-16 was retained simultaneously. In addition, the ZS series materials possessed open pores and large surfaces, which would facilitate the diffusion of reactants in the mesoporous channels. Moreover, the introduction of ZSM-5 seeds into composites could enhance the acidities of supports. As a result, the NiMo/ZS series catalysts exhibited high activities for DBT HDS processes. The NiMo/ZS-160 catalyst exhibited the highest catalytic efficiency (96.5%), which was apparently attributed to the synergistic contributions of the physicochemical properties of ZS supports and the dispersion states of active metals. Correspondingly, DBT HDS reactions over the NiMo/ZS series catalysts mainly proceeded via a hydrogenation desulfurization route that benefitted from the enhanced acidities especially the total Brønsted acid.

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Section: Resultssupporting

confidence: 73%

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

et al. 2020

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“…[8][9][10] Researchers have explored methods to remove 4,6-DMDBT with less pre-hydrogenation and improve the selectivity of the direct desulfurization (DDS) pathway which refers to elimination of sulfur atoms by direct breakage of CÀ S bonds by developing novel modified HDS catalysts. [11][12][13][14] Nevertheless, it is difficult to apply those catalysts at an industrial scale at present. Thus, we consider that 1 mol of 4,6-DMDBT is capable of generating 1-methyl-3-(3-methyl-cyclohexyl)-benzene through HYD pathway consuming 5 mol of H 2 when the minimum H 2 consumption is achieved (Figure 1(f)).…”

Section: Hdsmentioning

confidence: 99%

“…We would like to point out that while we understand that not all the HCR products are in gas phase, we assumed that all the HCR products are in gas phase since this made it easier for calculations. Therefore, the theoretical minimum H 2 consumption of HCR can be calculated using equation (13).…”

Section: Hcrmentioning

confidence: 99%

Developing an Approach for Calculating Theoretical Minimum Hydrogen Consumption during Catalytic Hydrotreating of Diesel

Liu,

Zhang,

Luo

et al. 2024

ChemPlusChem

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Identifying the unnecessary H2 consumption existing in diesel hydrotreating process and calculating theoretical minimum H2 consumption are extremely critical for reducing H2 consumption in consideration of carbon reduction and resource utilization improvement. In this work, chemical reactions happened during diesel hydrotreating were categorized into hydrodesulfurization (HDS), hydrodenitrogenation (HDN), saturation of monocyclic aromatic hydrocarbons (MAHs), saturation of polycyclic aromatic hydrocarbons (PAHs), hydrogenation of olefins (HGO) and hydrocracking reactions (HCR). Then, in order to gain insights into where and how much H2 can be reduced, the ideal molecular compositions of the products were analyzed when theoretical minimum H2 was achieved for each type of reactions, which can give a genuine value of average relative molecular weight and average number of moles of H2 consumed per mole of reactants, leading to the establishment of method for calculating theoretical minimum H2 consumption. Additionally, the above method was used to calculate theoretical minimum H2 consumption of five diesel feedstocks with different properties to study the influence of content of S, N and PAHs in the feed on theoretical minimum H2 consumption. This method can provide guidance for experiments of H2 consumption reduction, and also help the refineries to save potential costs of H2.

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“…The reaction mechanism of the hydrogenation process on CoMo catalyst has been studied pervasively, 13–16 however, the reaction process is still unclear and in dispute when using SO 2 as feedstock 17–20 . There are two main points on the mechanism of SO 2 hydrogenation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…Further characterization indicates the active sites are anion vacancies associated with the Co atoms present as CoMoS. 11 The reaction mechanism of the hydrogenation process on CoMo catalyst has been studied pervasively, [13][14][15][16] however, the reaction process is still unclear and in dispute when using SO 2 as feedstock. [17][18][19][20] There are two main points on the mechanism of SO 2 hydrogenation reaction.…”

mentioning

confidence: 99%

Study on the reaction mechanism of SO₂ hydrogenation over Mo‐based catalyst

Wang

et al. 2023

AIChE Journal

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Mo-based catalysts are widely used for the SO 2 hydrogenation process. However, the detailed reaction mechanism is still unclear and some details should be further supplemented. In this article, the SO 2 hydrogenation processes over the Mo-based catalyst were systematically studied. Several technologies including temperatureprogrammed experiments, isotope-tracing experiment, fourier transform infrared spectroscopy, and switching experiment were adopted to investigate the reaction steps. The results indicated that during the SO 2 hydrogenation process there were three reaction processes containing six steps: First SO 2 would adsorb on the active sites, which could start at relatively low temperature. Then the adsorbed SO 2 would react with H 2 and gradually form elemental sulfur that could be strongly anchored with S atoms of the MoS 2 surface. Afterward, the sulfur further reacted with H 2 to generate H 2 S. Alongside with the consumption of S atoms, the sulfur would be reduced and the active sites was recovered, thus starting the next reaction cycle.

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Deep insights into enhanced direct-desulfurization selectivity of thiourea-modified CoMoP/γ-Al2O3: An investigation of catalyst microstructures

Cited by 10 publications

References 31 publications

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

Developing an Approach for Calculating Theoretical Minimum Hydrogen Consumption during Catalytic Hydrotreating of Diesel

Study on the reaction mechanism of SO₂ hydrogenation over Mo‐based catalyst

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Deep insights into enhanced direct-desulfurization selectivity of thiourea-modified CoMoP/γ-Al2O3: An investigation of catalyst microstructures

Cited by 10 publications

References 31 publications

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

The Influence of Pore Structure and Acidity on the Hydrodesulfurization of Dibenzothiophene over NiMo-Supported Catalysts

Developing an Approach for Calculating Theoretical Minimum Hydrogen Consumption during Catalytic Hydrotreating of Diesel

Study on the reaction mechanism of SO2 hydrogenation over Mo‐based catalyst

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Study on the reaction mechanism of SO₂ hydrogenation over Mo‐based catalyst