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Publicado: 22 de junio de 2024

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1

Licea, Yordy E., Sandra L. Amaya, Adriana Echavarría, Jefferson Bettini, Jean G. Eon, Luz A. Palacio y Arnaldo C. Faro. "Simultaneous tetralin HDA and dibenzothiophene HDS reactions on NiMo bulk sulphide catalysts obtained from mixed oxides". Catal. Sci. Technol. 4, n.º 5 (2014): 1227–38. http://dx.doi.org/10.1039/c3cy00801k.

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2

LEDOUX, M. "Correlation between low-pressure thiophene HDS and high-pressure dibenzothiophene HDS". Journal of Catalysis 121, n.º 1 (enero de 1990): 70–76. http://dx.doi.org/10.1016/0021-9517(90)90217-8.

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3

Pawelec, B. "HDS of dibenzothiophene over polyphosphates supported on mesoporous silica". Journal of Catalysis 223, n.º 1 (1 de abril de 2004): 86–97. http://dx.doi.org/10.1016/j.jcat.2004.01.018.

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4

Sollner, Jacob, D. F. Gonzalez, J. H. Leal, T. M. Eubanks y J. G. Parsons. "HDS of dibenzothiophene with CoMoS2 synthesized using elemental sulfur". Inorganica Chimica Acta 466 (septiembre de 2017): 212–18. http://dx.doi.org/10.1016/j.ica.2017.06.028.

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5

Al-Rashidy, Ahmad H., Syed A. Ali, Shakeel Ahmed, Shaikh A. Razzak y Mohammad M. Hossain. "Phenomenological kinetics modeling of simultaneous HDS of dibenzothiophene and substituted dibenzothiophene over CoMoP/Al2O3 catalysts". Chemical Engineering Research and Design 104 (diciembre de 2015): 819–27. http://dx.doi.org/10.1016/j.cherd.2015.10.001.

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6

Gheni, Saba A., Saad A. Awad, Safaa M. R. Ahmed, Ghassan H. Abdullah y Muthanah Al Dahhan. "Nanoparticle catalyzed hydrodesulfurization of diesel fuel in a trickle bed reactor: experimental and optimization study". RSC Advances 10, n.º 56 (2020): 33911–27. http://dx.doi.org/10.1039/d0ra05748g.

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7

Tanimu, Abdulkadir, Saheed A. Ganiyu, Sagir Adamu y Khalid Alhooshani. "Synthesis, application and kinetic modeling of CeOx–Si–CoMo catalysts for the hydrodesulfurization of dibenzothiophene". Reaction Chemistry & Engineering 4, n.º 4 (2019): 724–37. http://dx.doi.org/10.1039/c8re00330k.

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8

Lara, Gerardo, José Escobar, José A. De Los Reyes, María C. Barrera, José A. Colín y Florentino R. Murrieta. "Dibenzothiophene HDS Over Sulphided CoMo on High-Silica USY Zeolites". Canadian Journal of Chemical Engineering 83, n.º 4 (19 de mayo de 2008): 685–94. http://dx.doi.org/10.1002/cjce.5450830409.

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9

Grossman, M. J., M. K. Lee, R. C. Prince, V. Minak-Bernero, G. N. George y I. J. Pickering. "Deep Desulfurization of Extensively Hydrodesulfurized Middle Distillate Oil by Rhodococcus sp. Strain ECRD-1". Applied and Environmental Microbiology 67, n.º 4 (1 de abril de 2001): 1949–52. http://dx.doi.org/10.1128/aem.67.4.1949-1952.2001.

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ABSTRACT Dibenzothiophene (DBT), and in particular substituted DBTs, are resistant to hydrodesulfurization (HDS) and can persist in fuels even after aggressive HDS treatment. Treatment by Rhodococcussp. strain ECRD-1 of a middle distillate oil whose sulfur content was virtually all substituted DBTs produced extensive desulfurization and a sulfur level of 56 ppm.
10

Albiter, M. A., R. Huirache-Acuña, F. Paraguay-Delgado, J. L. Rico y G. Alonso-Nuñez. "Synthesis of MoS2nanorods and their catalytic test in the HDS of dibenzothiophene". Nanotechnology 17, n.º 14 (20 de junio de 2006): 3473–81. http://dx.doi.org/10.1088/0957-4484/17/14/020.

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11

Egorova, M. "Mutual influence of the HDS of dibenzothiophene and HDN of 2-methylpyridine". Journal of Catalysis 221, n.º 1 (1 de enero de 2004): 11–19. http://dx.doi.org/10.1016/s0021-9517(03)00264-1.

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12

Xu, Yingrui, Shunqin Liang, Limin Sun, Xiaoli Hu, Yuqi Zhang, Weikun Lai, Xiaodong Yi y Weiping Fang. "Management of γ-Alumina with High-Efficient {111} External Surfaces for HDS Reactions". Catalysts 10, n.º 11 (30 de octubre de 2020): 1254. http://dx.doi.org/10.3390/catal10111254.

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A series of γ-alumina samples with different exposure ratio of {111} facet were synthesized by an efficient hydrothermal method via adjusting the pH value of the gel precursor. The nanorod alumina supported catalyst with the highest exposure of {111} facet exhibited the best hydrodesulfurization (HDS) activities of both thiophene and dibenzothiophene (DBT). Characterization of the sulfided NiMo/Al2O3 catalyst with preferential exposure of {111} facet showed that the MoS2 nano slabs were inclined to distribute in the direction along the edges of alumina nanocrystal in reduced stacking layers. The selective exposure of {111} facet played a decisive role in obtaining alumina-supported HDS catalysts with improved intrinsic activity. This work helps to better understand the relationship between catalytic properties and varied support surfaces, which demonstrate a proper design of the catalyst support morphology on the facet-level.
13

Xia, Liang Yan, Zhi Xiang Xia, Wei Tang, Hong Yan Wang y Meng Xiang Fang. "Hydrogenation of Model Compounds Catalyzed by MCM-41-Supported Nickel Phosphide". Advanced Materials Research 864-867 (diciembre de 2013): 366–72. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.366.

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MCM-41 supported nickel phosphide (Ni2P/MCM-41) was prepared by temperature-programmed reduction of the corresponding phosphate. The catalyst activity for hydrodeoxygenation (HDO), hydrodearomatization (HDA), hydrodenitrogenation (HDN) and hydrodesulfurization (HDS) was investigated in a fixed bed reactor. O-cresol HDO, 1-methylnaphthalene HDA, quinoline HDN, dibenzothiophene HDS and simultaneous HDO, HDA, HDN, HDS were respectively tested at different temperatures with constant pressure (6.0 MPa), liquid hourly space velocity (3.0 h-1), hydrogen-to-oil volume ratio (600:1). The results indicate that Ni2P /MCM-41 catalyst has great performance on HDO, HDA, HDN, HDS in single model compound reactions. O-cresol and DBT are almost completely transformed at 375°C, while 1-methylnaphthalene and quinoline reach the highest conversion at 300°C. In the simultaneous reactions, quinoline shows higher conversion by competitive adsorption on the catalyst hydrogenation sites, leading to conversion decrease of o-cresol, 1-methylnaphthalene and DBT.
14

Ahmad, Abrar, Othman A. Baothman, Muhammad Shahid Nadeem y Varish Ahmad. "Biodesulfurizing Microbes in the Petroleum Refinery Areas of Saudi Arabia". Journal of Pure and Applied Microbiology 17, n.º 3 (1 de septiembre de 2023): 1737–47. http://dx.doi.org/10.22207/jpam.17.3.39.

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Gordonia sp., Rhodococcus, Paenibaccilus, Mycobacterium and many other desulfurizing strains have shown good potential for dibenzothiophene (DBT), 4, 6-Dimethyldibenzothiophene (4-6-Dimethyl dibenzothiophene) and other organosulfur biodesulfurization. These are microbes which have 4S pathway to remove S from remaining calcitarant organosulfur compounds even after deep desulfurization. Sulfur compounds present in crude oils, diesel and petrol when combust in engines they emerge out in the form of elemental Sulfur, which causes environmental and health problems. Therefore, efforts are going to remove this Sulfur compounds by Hydrodesulfurization (HDS) treatment. Some organosulfur compounds remain there even after HDS, which can only remove by highly evolved microbes residing nearby petroleum-contaminated areas in refineries zone. Nature has such adopted and evolved microbes for the bioremediation of such toxic substances. Here we have isolated and characterized highly evolved and adopted Biodesulfurizing microbes present around oil refineries in Kingdom of Saudi Arabia and prepare the culture collection of such highly evolved and adopted biodesulfurization microorganisms for future application of applied Industrial petroleum refineries, which can reduce the Sulfur load in the petroleum products. The several (10 different types) microbes have been reported in these soils to grow in sulfur compounds. Out of these microbes one microbe desulfurizes by 4S pathway. It was identified to be Rhodococcus erythropolis type named as Rhodococcus erythroplis KAU10. They show good potential for various organosulfur compounds (DBT, 2,4,6-Trimethyl Benzothiophene, Benzothiophene, Dibenzyl sulfide, Benzonaphthothiophene, Dibenzothiophene sulfone, along with crude oil and Petrol and Diesel. Isolated strain Rhodococcus erythroplis KAU10 have good potential for Biodesulfurization.
15

Timoshkina, V. V., S. V. Yudintsev, E. D. Frenkel’ y A. A. Pimerzin. "V-Containing Heteropoly Acids with Keggin Structure as Precursors of Sulfide Catalysts: Regularities of the Convertion of Dibenzothiophene and Naphthalene on Nonpromoted Mo–V Catalysts". Petroleum Chemistry 62, n.º 7 (julio de 2022): 779–87. http://dx.doi.org/10.1134/s0965544122050085.

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Abstract Mixed PMoV heteropoly acids with Keggin structures H3+xPMo12–xVxO40 (x = 1–6) and modified sulfide catalysts on their basis were synthesized, their physicochemical characteristics were determined, and their performance in the reactions of hydrodesulfurization (HDS) of dibenzothiophene (DBT) and hydrogenation of naphthalene was evaluated. Modification of the Mo-containing catalysts with vanadium by impregnation with a solution of mixed heteropoly acids was found to enhance their catalytic activity in the studied reactions, as well as to increase the selectivity for the direct hydrodesulfurization route of the DBT HDS reaction.
16

Martínez Guerrero, Reynaldo, Agileo Hernández-Gordillo, Víctor Santes, Jorge Roberto Vargas García, José Escobar, Leonardo Díaz-García, Lucía Díaz Barriga Arceo y Vicente Garibay Febles. "Monometallic Pd and Pt and Bimetallic Pd-Pt/Al2O3-TiO2for the HDS of DBT: Effect of the Pd and Pt Incorporation Method". Journal of Chemistry 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/679281.

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The effect of the preparation method of monometallic Pd and Pt and bimetallic Pd-Pt/Al2O3-TiO2catalysts on the hydrodesulfurization (HDS) of dibenzothiophene (DBT) was investigated in this study. The synthesis was accomplished using three methods: (A) impregnation, (B) metal organic chemical vapor deposition (MOCVD), and (C) impregnation-MOCVD. The bimetallic Pd-Pt catalyst prepared by the impregnation-MOCVD method was most active for the HDS of DBT compared to those prepared by the single impregnation or MOCVD method due to the synergetic effect between both noble metals. The greater selectivity toward biphenyl indicated that this bimetallic Pd-Pt catalyst preferentially removes sulfur via the direct desulfurization mechanism. However, the bimetallic Pd-Pt catalyst prepared using the single MOCVD method did not produce any cyclohexylbenzene, which is most likely associated with the hydrogenation/dehydrogenation sites.
17

Nagai, Masatoshi, Hiroyuki Tominaga, Takeshi Arahata y Atsushi Irisawa. "Deactivation and Modeling of Nitrided and Sulfided Mo/Al2O3 Catalysts during Dibenzothiophene HDS". JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 38, n.º 10 (2005): 785–90. http://dx.doi.org/10.1252/jcej.38.785.

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18

Jiang, Nan, Bolong Jiang, Jian Wang y Hua Song. "Preparation of the Ni2P/Al-MCM-41 catalyst and its dibenzothiophene HDS performance". New Journal of Chemistry 44, n.º 20 (2020): 8379–85. http://dx.doi.org/10.1039/d0nj01106a.

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Ni2P/Al-MCM-41 catalysts were prepared. The incorporation of Al could promote the formation of small sized crystalline Ni2P and modificate its surface, which will finally results in the increase in catalytic performance.
19

Albiter, M. A., R. Huirache-Acuña, F. Paraguay-Delgado, F. Zaera y G. Alonso-Núñez. "Co(Ni)/MoS2 Nanostructured Catalysts for the Hydrodesulphurization of Dibenzothiophene". Journal of Nanoscience and Nanotechnology 8, n.º 12 (1 de diciembre de 2008): 6437–44. http://dx.doi.org/10.1166/jnn.2008.18403.

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In this study Co(Ni)/MoS2 unsupported nanocatalysts (nanorods and nanoribbons) were synthesized with Co(Ni)/(Co(Ni)+Mo)=0.3, 0.5 molar ratios for Co and Ni respectively. First the α-MoO3 nanostructures were impregnated with an aqueous solution of Co(Ni)Cl2·6H2O or Co(Ni)(NO3)2·6H2O, then were treated for 2 h at 473 K, and finally the precursors were activated under a H2S/H2 mixture (15% v/v H2S) by ramping the temperature from room temperature to 773 K and keeping it at that value for 2 h. The resulting materials were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction, specific surface area and X-ray photoelectron spectroscopy, and tested as catalysts for the hydrodesulfurization (HDS) of dibenzothiophene (DBT). It was found that these materials presented specific surface areas below 25 m2/g. The catalytic test showed that only when Co is added a promoter effect is observed compared with MoS2 unpromoted catalysts. Among the materials prepared, the Co/MoS2 catalyst made from cobalt chloride presented the highest catalytic activity (6.95 mol s−1 g−1catalyst) for the HDS of DBT. The selectivity for the latter indicated a clear preference for the direct desulphurization over the hydrogenating pathway.
20

Giraldo, Sonia A., Víctor G. Baldovino Medrano y Aristóbulo Centeno. "Evaluating the functionalities of NiMo/y-Al2O3-B2O3 catalysts in naphthalene hydrodearomatization and dibenzothiophene hydrodesulfurization". CT&F - Ciencia, Tecnología y Futuro 4, n.º 2 (30 de diciembre de 2010): 91–99. http://dx.doi.org/10.29047/01225383.290.

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The aim of this work is to contribute to the current understanding on the role of the support’s acidic properties in the hydrogenating function of NiMo/-Al2O3 type catalysts during hydrodearomatization (HDA) and dibenzothiophene (DBT) type molecules desulfurization. NiMo/-Al2O3-B2O3 catalysts of different B2O3 (0, 2, 3, 6 and 8 wt.%) contents were prepared and tested in independent and simultaneous naphthalene (NP) HDA and DBT hydrodesulfurization (HDS) reactions. For HDA the catalytic activity as a function of the B2O3 content followed a volcano-shape trend, with a maximum around 3 wt.% of B2O3. In DBT desulfurization boron was found to have a positive effect in the development of the HYD route of desulfurization possibly due to an increase in total acidity. Conversely, the direct desulfurization route (DDS) was negatively affected by boron addition. The presence of NP during the HDS of DBT was found to have a significant effect in neither total HDS activity nor the HYD/DDS selectivity. The findings in this paper are significant for ultra-deep HDS of heavy oil cuts where increasing in the selectivity to HYD is a must because highly refractory alkyl-DBTs mostly react by this reaction route.
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Cecilia, J. A., A. Infantes-Molina, E. Rodríguez-Castellón y A. Jiménez-López. "A novel method for preparing an active nickel phosphide catalyst for HDS of dibenzothiophene". Journal of Catalysis 263, n.º 1 (1 de abril de 2009): 4–15. http://dx.doi.org/10.1016/j.jcat.2009.02.013.

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22

Song, Hua, Jian Wang, Zidong Wang, Hualin Song, Feng Li y Zaishun Jin. "Effect of titanium content on dibenzothiophene HDS performance over Ni2P/Ti-MCM-41 catalyst". Journal of Catalysis 311 (marzo de 2014): 257–65. http://dx.doi.org/10.1016/j.jcat.2013.11.021.

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23

Song, Hua, Fuyong Zhang, Hualin Song, Xiaowei Xu y Feng Li. "The effect of neodymium content on dibenzothiophene HDS performance over a bulk Ni2P catalyst". Catalysis Communications 69 (septiembre de 2015): 59–62. http://dx.doi.org/10.1016/j.catcom.2015.05.028.

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24

Tominaga, Hiroyuki, Takeshi Arahata y Masatoshi Nagai. "Non-parametric determination of reactivity distribution for nitrided Mo/Al2O3 catalysts during dibenzothiophene HDS". Chemical Engineering Science 63, n.º 20 (octubre de 2008): 5071–75. http://dx.doi.org/10.1016/j.ces.2007.11.041.

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25

Liu, Yu, Chun Hai Yi, Jia Yang Hu y Bo Lun Yang. "Gasoline Desulfurization with Two Catalytic Distillation Columns". Advanced Materials Research 550-553 (julio de 2012): 550–53. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.550.

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A new approach was proposed to remove sulfuric compounds from fluid catalytic cracking (FCC) gasoline by combining an alkylation desulfurization catalytic distillation (ADCD) column with a hydrodesulfurization catalytic distillation (HDS-CD) column. In the ADCD column, isobutylene (IB) and 3-methylthiophene (3MT) were designated as the model compounds for olefin and sulfide, respectively; NKC-9 cation exchange resin was used as the catalyst. In the HDS-CD column, dibenzothiophene (DBT) was chosen as the model sulfides; Nickel phosphide supported on the TiO2-Al2O3 composite oxide prepared by our laboratory were designated as the HDS catalyst. Simulations for these two CD columns were carried out by RADFRAC module of Aspen Plus. The optimization results revealed that the ADCD column had an alkylation selectivity of 96%, and the sulfur content in the overhead stream was less than 8 μg/g. The simulation results of the HDS-CD process showed that the sulfide in the bottom stream of ADCD column can be removed practically by 100% and the clean oil stream from the bottom of HDS-CD column has hardly any sulfur.
26

Parsafard, Nastaran, Mohammad Hasan Peyrovi, Zahra Mohammadian y Niloofar Atashi. "Activity Evaluation of CoMo Nanoparticles Supported on Meso-microporous Composites in Dibenzothiophene Hydrodesulphurization". Bulletin of Chemical Reaction Engineering & Catalysis 15, n.º 1 (24 de octubre de 2019): 112–18. http://dx.doi.org/10.9767/bcrec.15.1.5556.112-118.

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CoMo-supported mesoporous catalysts were synthesized by 50 wt% of HZSM-5 and 50 wt% of FSM-16, KIT-6, and MCM-48. These catalysts were prepared by the wet-impregnation method and pre-sulfided with CS2. The catalytic performance was evaluated for HDS reaction of dibenzothiophene over a temperature range of 250-400 °C in a micro fixed-bed reactor under atmospheric pressure. The supported CoMo bimetallic catalysts were characterized by XRD, XRF, FT-IR, N2 adsorption-desorption, and SEM. The CoMo/KIT-6/HZSM-5 indicate higher activity than other catalysts at 400 °C for dibenzothiophene hydrodesulphurization. Also, the best selectivity to cyclohexylbenzene (CHB) is related to CoMo/FSM-16/HZSM-5. The activation energy was also calculated for all prepared catalysts for the conversions of less than 10%; according to which, the activation energy for CoMo/KIT-6/HZSM-5 is less than other catalysts (~21 kJ/mol) which can be related to the appropriate pore size and high surface area of the support. Copyright © 2020 BCREC Group. All rights reserved
27

Zhang, Jing Cheng, Hai Bin Yu, Jun Nan, Shan Geng, Xiao Guo Li, Xiao Long Qu, Yu Lin Shi, Yu Ting Zhang y Hong Guang Liu. "Synthesis and Hydrodesulfurization Performance of NiMo Sulfide Catalysts Supported on γ-Al2O3". Advanced Materials Research 781-784 (septiembre de 2013): 304–7. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.304.

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This work presents the synthesis and hydrodesulfurization performance of NiMo sulfide catalysts supported on γ-Al2O3 during the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The catalysts were synthesized by the co-impregnation method using an atomic ratio of Ni=Ni/(Ni+Mo)=0.5. The materials were characterized by N2 physisorption, XRD and HRTEM. This catalyst exhibited the larger pore size and high specific surface area, as well as better morphological properties. The catalytic activity was evaluated using a high-pressure batch reactor at 280 °C and 3.0 MPa. The catalytic activity during HDS-DBT indicated that the NiMoS/γ-Al2O3 catalyst was better than that NiMoS/γ-Al2O3 catalyst. the NiMoS/γ-Al2O3 catalyst exhibits higher DDS selectivity (3.0) than NiMo/γ-Al2O3 catalyst (2.55).
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Ríos-Caloch, Guillermina, Víctor Santes, José Escobar, Patricia Pérez-Romo, Leonardo Díaz y Luis Lartundo-Rojas. "Effect of Chitosan on the Performance of NiMoP-Supported Catalysts for the Hydrodesulfurization of Dibenzothiophene". Journal of Nanomaterials 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/4047874.

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Chitosan-added NiMoP catalysts supported on alumina and alumina-titania were studied in the hydrodesulfurization (HDS) of dibenzothiophene (DBT). The preparation of catalysts containing Mo (12 wt%), Ni (3 wt%), P (1.6 wt%), and chitosan/nickel = 2 (mol ratio) was accomplished by sequential pore-filling impregnation varying the order of chitosan integration. Materials were characterized by DRIFTS, TPR, TG-DTA, and XPS techniques. The TG-DTA study showed that the nature of the support influences the degradation of chitosan onto the catalytic materials and also influences the HDS of DBT and the product distribution as well. The series of catalysts supported on alumina presented the most remarkable effect of chitosan, in which the OH and NH groups of the organic molecule interact with acid sites of the support weakening the interaction between alumina and deposited metal phases. In all cases, DBT was converted mainly through direct sulfur removal. The catalysts ChP3/A (alumina support impregnated with chitosan in phosphoric acid solution, prior to NiMoP deposition) and ChP4/AT (alumina-titania support impregnated with NiMoP solution, prior to contacting with a solution comprising chitosan and phosphorus) exhibited the best performance in HDS reactions and also showed the highest selectivity in biphenyl formation. Presence of carbonaceous residua on the catalyst’s surface, as shown by XPS, could enhance the HDS activity over the ChP4/AT sample.
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Bianchini, Claudio, M. Victoria Jimenez, Andrea Meli, Simonetta Moneti, Francesco Vizza, Veronica Herrera y Roberto A. Sanchez-Delgado. "Hydrodesulfurization (HDS) Model Systems. Opening, Hydrogenation, and Hydrodesulfurization of Dibenzothiophene (DBT) at Iridium. First Case of Catalytic HDS of DBT in Homogeneous Phase". Organometallics 14, n.º 5 (mayo de 1995): 2342–52. http://dx.doi.org/10.1021/om00005a035.

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Majodina, Siphumelele, Zenixole R. Tshentu y Adeniyi S. Ogunlaja. "Effect of Adding Chelating Ligands on the Catalytic Performance of Rh-Promoted MoS2 in the Hydrodesulfurization of Dibenzothiophene". Catalysts 11, n.º 11 (18 de noviembre de 2021): 1398. http://dx.doi.org/10.3390/catal11111398.

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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.
31

Schacht, P., S. Ramírez y J. Ancheyta. "CoMo/Ti-MCM-41/Alumina Catalysts: Properties and Activity in the Hydrodesulfurization (HDS) of Dibenzothiophene (DBT)". Energy & Fuels 23, n.º 10 (15 de octubre de 2009): 4860–65. http://dx.doi.org/10.1021/ef900248g.

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Song, Shaotong, Xiaofeng Zhou, Aijun Duan, Zhen Zhao, Kebin Chi, Minghui Zhang, Guiyuan Jiang, Jian Liu, Jianmei Li y Xilong Wang. "Synthesis of mesoporous silica material with ultra-large pore sizes and the HDS performance of dibenzothiophene". Microporous and Mesoporous Materials 226 (mayo de 2016): 510–21. http://dx.doi.org/10.1016/j.micromeso.2016.01.034.

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Varga, Zoltán, Jenő Hancsók, Gábor Nagy, György Pölczmann y Dénes Kalló. "Upgrading of gas oils: the HDS kinetics of dibenzothiophene and its derivatives in real gas oil". Topics in Catalysis 45, n.º 1-4 (agosto de 2007): 203–6. http://dx.doi.org/10.1007/s11244-007-0266-z.

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34

Wang, Haiyan, Shida Liu, Rubenthran Govindarajan y Kevin J. Smith. "Preparation of Ni-Mo 2 C/carbon catalysts and their stability in the HDS of dibenzothiophene". Applied Catalysis A: General 539 (junio de 2017): 114–27. http://dx.doi.org/10.1016/j.apcata.2017.04.008.

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Song, Hua, Qi Yu, Yanguang Chen, Yuanyuan Wang y Ruixia Niu. "Preparation of highly active MCM-41 supported Ni 2 P catalysts and its dibenzothiophene HDS performance". Chinese Journal of Chemical Engineering 26, n.º 3 (marzo de 2018): 540–44. http://dx.doi.org/10.1016/j.cjche.2017.09.001.

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Hong, Xin y Ke Tang. "Secondary Synthesis of Microporous Heteroatoms Y Zeolite and their Hydrodesulfurization Properties for Model Fuel". Key Engineering Materials 645-646 (mayo de 2015): 1163–69. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.1163.

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Gallium atoms have been introduced into the framework of Y zeolite by treating the zeolite with an aqueous solution of ammonium hexafluoro gallate. The synthesized Y zeolite ([Ga]AlY) was characterized by means of X-Ray Diffraction (XRD), N2 adsorption, Infrared spectrophotometer (IR) and Inductively Coupled Plasma (ICP). The results indicated that Ga has been substituted into the faujasitic framework. Hydrodesulfurization (HDS) of various model fuels containing about 500 μg/g sulfur has been studied over the [Ga]AlY. The activity of the [Ga]AlY catalysts on HDS reaction is highly affected by the temperature and kind of sulfide in model fuels. The conversion for thiophene, benzothiophene (BT) and dibenzothiophene (DBT) in model fuel 1, 2 or 3 was 81.2%, 60.7% and 37.2% respectively. Compared with the model fuel 1, 2 and 3, the conversion of every sulfide in model fuel 4 was much lower which can be due to the competitive adsorption between between the three of them.
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Liu, Cong, Pei Yuan y Chunsheng Cui. "The Pore Confinement Effect of FDU-12 Mesochannels on MoS2Active Phases and Their Hydrodesulfurization Performance". Journal of Nanomaterials 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/5208027.

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FDU-12 silica with highly ordered face-centered cubic mesoporous structure is developed as support to prepare Mo/FDU-12 catalysts for hydrodesulfurization (HDS) of dibenzothiophene (DBT). A series of Mo/FDU-12 catalysts are synthesized by using incipient wetness impregnation method with different MoO3loadings (6, 8, 10, 12, and 15 wt.%). The objective of this work is to explore the pore confinement effect of FDU-12 mesochannels on the MoS2morphology with various metal loadings. It is found that, as increasing MoO3loadings from 6 to 15 wt.%, the MoS2nanocrystallites transform from monolayer to multilayer and the morphology changes from straight layered to curved and then to ring-like and finally to spherical-like morphology due to the restriction of cage-like pore channels of FDU-12 support. The HDS results show that the catalytic activity increases first and then decreases with the best HDS performance at the MoO3loading of 10 wt.%. In addition, we compared the HDS activity of Mo catalyst supported on FDU-12 with that on the commercialγ-Al2O3and SBA-15; the result exhibits that FDU-12 is superior to the other two supports due to its large pore size and ordered three-dimensional open pore channels.
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Rivera-Muñoz, Eric, Rafael Huirache-Acuña, Beatriz Millán-Malo, Rufino Nava, Barbara Pawelec y Cristina Loricera. "Crystallographic studies through HRTEM and XRD of MoS2nanostructures". Acta Crystallographica Section A Foundations and Advances 70, a1 (5 de agosto de 2014): C512. http://dx.doi.org/10.1107/s205327331409487x.

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Mesoporous and silica-based SBA-15 and SBA-16 materials were used as supports of novel nanostructured ternary Co(Ni)-Mo-W hydrodesulphurization (HDS) catalysts. These materials have shown a high catalytic activity in HDS of dibenzothiophene (DBT) reactions, even much higher compared with commercial catalysts. An exploration was made on the structure of both the supports as well as on tri-metallic sulfide HDS catalysts. The sulfided catalysts were tested in the HDS of DBT performed in a batch reactor at 623 K and total pressure of 3.1 MPa. The calcined and fresh sulfide catalysts were characterized by a variety of techniques, such as N2 adsorption-desorption isotherms, Temperature-Programmed Desorption (TPD) of NH3, X-ray Diffraction (XRD) and High Resolution Transmission Electron Microscopy (HRTEM). It has been found that both the morphology of the supports as its modification with varying amounts of phosphorus affect the catalytic activity of these nanostructured materials in HDS of DBT reactions. Furthermore, the nanostructures which correspond to the tri-metallic sulfided catalysts exhibit a typical morphology of MoS2 – 2H structure. The present work shows the microstructural study of these nanostructured materials, carried out from HRTEM images and XRD analysis. Both techniques, X–ray Diffractometry and High Resolution Transmission Electron Microscopy, play a fundamental role in the characterization of the microstructure of HDS catalytic nanomaterials, as well as in understanding the various phenomena involved, starting from the synthesis process unto the final performance of those materials.
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Thepwatee, Sukanya, Nitipon Chekuntod, Atisayapan Chanchawee y Pawnprapa Pitakjakpipop. "Light-Enhanced Adsorptive Desulfurization of Dibenzothiophene Using Supported TiO2-ZrO2". Key Engineering Materials 798 (abril de 2019): 391–96. http://dx.doi.org/10.4028/www.scientific.net/kem.798.391.

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Combustion of diesel fuel containing sulfur compounds emits SOx into atmosphere causing acid rain and respiratory illness in human. Dibenzothiophene (DBT) is one of the most difficult sulfur compounds in diesel to be removed by hydrodesulfurization (HDS). To produce ultra-low sulfur diesel (<15 ppmw-S), severe operating condition is required. As a result, production cost is increase. In this work, we investigated an alternative method for sulfur removal called Light-enhanced Adsorptive Desulfurization or L-ADS using supported TiO2-ZrO2. The TiO2-ZrO2 was loaded on commercial γ-Al2O3, fumed silica (FS), silica gel (SG) and zeolite (Z30) by wet-impregnation method. Impact of these supports on DBT removal were focused. Characteristic of the supported TiO2-ZrO2 was analyzed by N2 adsorption-desorption, scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS), and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The presence of TiO2-ZrO2 greatly enhanced DBT removal compared to TiO2 and ZrO2. SG promoted DBT removal by facilitating the adsorption of dibenzothiophene sulfone (DBTO2), a product of DBT photocatalytic oxidation. Using TiO2-ZrO2/SG, 86% of sulfur was removed from 50 ppmw-S DBT/C16 within 4 h.
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Kim, Jihyun y Yong-Kul Lee. "Reactivity of Sulfur and Nitrogen Compounds of FCC Light Cycle Oil in Hydrotreating over CoMoS and NiMoS Catalysts". Catalysts 13, n.º 2 (26 de enero de 2023): 277. http://dx.doi.org/10.3390/catal13020277.

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NiMoS and CoMoS catalysts were synthesized and applied to hydrotreating (HDT) of FCC light cycle oils (FCC-LCO) in an autoclave batch reactor at 613 K and 8.6 MPa H2. The S and N compounds in LCO were classified into four and three groups, respectively, in terms of the HDT reactivity. The individual and the competitive reactivities of the S and N compounds in the HDS and the HDN were investigated over the conventional CoMoS and NiMoS catalysts using S and N model compounds (dibenzothiophene, DBT, and carbazole, CBZ). In the HDS of DBT, both the direct desulfurization (DDS) and pre-hydrogenation pathway (HYD) were found to proceed, whereas the HYD pathway was favored for the HDN of CBZ. As a result, the NiMoS catalyst that facilitates the HYD pathway showed better activity in the HDN of LCO than the CoMoS (k = 10.20 × 10−2 vs. 1.80 × 10−2 h−1). Indeed, the HDS of LCO over the NiMoS was more favorable than that over the CoMoS catalyst (k = 4.3 × 10−1 vs. 3.6 × 10−1 h−1).
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Navarro Yerga, Rufino M., Barbara Pawelec, Noelia Mota y Rafael Huirache-Acuña. "Hydrodesulfurization of Dibenzothiophene over Ni-Mo-W Sulfide Catalysts Supported on Sol-Gel Al2O3-CeO2". Materials 15, n.º 19 (30 de septiembre de 2022): 6780. http://dx.doi.org/10.3390/ma15196780.

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To achieve sulfur content in gas oil at a near-zero level, new catalysts with improved hydrogenation functions are needed. In this work, new Ni-Mo-Mo hydrodesulfurization (HDS) catalysts supported by Al2O3-CeO2 materials were synthesized to evaluate their efficiency in the reaction of HDS with dibenzothiophene (DBT). Al2O3-CeO2 supports different CeO2 loadings (0, 5, 10 and 15 wt.%) and supported NiMoW catalysts were synthesized by sol-gel and impregnation methods, respectively. The physicochemical properties of the supports and catalysts were determined by a variety of techniques (chemical analysis, XRD, N2 physisorption, DRS UV-Vis, XPS, and HRTEM). In the DBT HDS reaction carried out in a batch reactor at 320 °C and a H2 pressure of 5.5 MPa, the sulfide catalysts showed a dramatic increase in activity with increasing CeO2 content in the support. Nearly complete DBT conversion (97%) and enhanced hydrogenation function (HYD) were achieved on the catalyst with the highest CeO2 loading. The improved DBT conversion and selectivity towards the hydrogenation products (HYD/DDS ratio = 1.6) of this catalyst were attributed to the combination of the following causes: (i) the positive effect of CeO2 in forcing the formation of the onion-shaped Mo(W)S2 layers with a large number of active phases, (ii) the inhibition of the formation of the undesired NiAlO4 spinel phase, (iii) the appropriate textural properties, (iv) the additional ability for heterolytic dissociation of H2 on the CeO2 surfaces, and (v) the increase in Brønsted acidity.
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Li, Guangci, Li Yue, Ruikun Fan, Di Liu y Xuebing Li. "Synthesis of a Co–Mo sulfide catalyst with a hollow structure for highly efficient hydrodesulfurization of dibenzothiophene". Catalysis Science & Technology 7, n.º 23 (2017): 5505–9. http://dx.doi.org/10.1039/c7cy01724c.

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43

Wu, Li Bao, Dong Mei Jiao, Li Fang Chen, Jin An Wang y Fa Hai Cao. "Comparative Studies of the CoMo/MgO, CoMo/Al2O3 and CoMo/MgO-MgAl2O4 Catalysts Prepared by a Urea-Matrix Combustion Method". Advanced Materials Research 132 (agosto de 2010): 45–54. http://dx.doi.org/10.4028/www.scientific.net/amr.132.45.

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Three CoMo supported catalysts with different supports, Al2O3, MgO and MgO-MgAl2O4, were prepared by a urea matrix combustion method. The physicochemical properties of the catalysts were characterized by N2 isothermal adsorption–desorption, powder X-ray diffraction (XRD) and temperature programmed reduction (TPR) techniques. The activity of these catalysts was evaluated in a fixed-bed high-pressure reactor using hydrodesulfurization of dibenzothiophene as a model reaction. The urea matrix combustion preparation method greatly favored the formation of highly dispersed Co- and Mo-oxo species on the support, which had significant influence on the hydrodesulfurization (HDS) activity. XRD analysis showed that MgO was more sensitive to the deposition of Co-O or Mo-O species than Al2O3 and MgAl2O4; the former might be potentially used as an indicator of the Co- and Mo-oxo species formation. Among these catalysts, CoMo/MgO-MgAl2O4 exhibited a high HDS activity.
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Rabarihoela-Rakotovao, V., S. Brunet, G. Perot y F. Diehl. "Effect of H2S partial pressure on the HDS of dibenzothiophene and 4,6-dimethyldibenzothiophene over sulfided NiMoP/Al2O3 and CoMoP/Al2O3 catalysts". Applied Catalysis A: General 306 (junio de 2006): 34–44. http://dx.doi.org/10.1016/j.apcata.2006.03.029.

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45

Yuan, Pei, Xue-Qin Lei, Hong-Ming Sun, Hong-Wei Zhang, Chun-Sheng Cui, Yuan-Yuan Yue, Hai-Yan Liu, Xiao-Jun Bao y Ting-Hai Wang. "Effects of pore size, mesostructure and aluminum modification on FDU-12 supported NiMo catalysts for hydrodesulfurization". Petroleum Science 17, n.º 6 (1 de septiembre de 2020): 1737–51. http://dx.doi.org/10.1007/s12182-020-00502-5.

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AbstractA series of NiMo/FDU-12 catalysts with tunable pore diameters and mesostructures have been controllably synthesized by adjusting the synthetic hydrothermal temperature and applied for the hydrodesulfurization of dibenzothiophene and its derivative. The state-of-the-art electron tomography revealed that the pore sizes of FDU-12 supports were enlarged with the increase in the hydrothermal temperature and the mesostructures were transformed from ordered cage-type pores to locally disordered channels. Meanwhile, the MoS2 morphology altered from small straight bar to semibending arc to spherical shape and finally to larger straight bar with the change of support structures. Among them, FDU-12 hydrothermally treated at 150 °C possessed appropriate pore diameter and connected pore structure and was favorable for the formation of highly active MoS2 with curved morphology; thus, its corresponding catalyst exhibited the best HDS activity. Furthermore, it was indicated that the isomerization pathway could be significantly improved for HDS of 4,6-dimethyldibenzothiophene after the addition of aluminum, which was expected to be applied to the removal of the macromolecular sulfur compounds. Our study sheds lights on the relationship between support effect, active sites morphology and HDS performance, and also provides a guidance for the development of highly active HDS catalysts.
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Prokic-Vidojevic, Dragana, Sandra Glisic, Radojica Pesic y Aleksandar Orlovic. "Desulphurisation of dibenzothiophene and 4,6–dimethyl dibenzothiophene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: kinetic parameters estimation and modelling". Chemical Industry 76, n.º 3 (2022): 135–45. http://dx.doi.org/10.2298/hemind220114008p.

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Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography?mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on ? and ? active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.
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Teixeira da Silva, V. L. S., M. Schmal, V. Schwartz y S. T. Oyama. "Synthesis of a Mo/Nb mixed carbide". Journal of Materials Research 13, n.º 7 (julio de 1998): 1977–88. http://dx.doi.org/10.1557/jmr.1998.0278.

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Molybdenum and niobium carbides (β−Mo2C, NbC), as well as mixed carbides of molybdenum and niobium, were synthesized by the temperature-programmed carburization method (TPC) using a 20 vol% CH4/H2 gas mixture. The starting materials were MoO3, B-Nb2O5, and physical mixtures of B-Nb2O5/MoO3 with Nb/(Nb + Mo) atomic ratios varying from 0.2 to 0.8, respectively. Results from catalytic and temperatureprogrammed oxidation (TPO) measurements indicate that during the carburization of the Nb2O5/MoO3 physical mixture with Nby(Nb + Mo) = 0.8 there is, besides β−Mo2C and NbC formation, the appearance of a carbidic phase not detectable by x-ray diffraction (XRD). This phase appears to be highly active and selective for the dibenzothiophene hydrodesulfurization (HDS) reaction.
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Delgado, Anabel D., Lorena Álvarez-Contreras, Karen A. Beltrán, Noé Arjona, Minerva Guerra-Balcázar, José Béjar y Alfredo Aguilar-Elguezabal. "Monolayer CoMoS Catalysts on Hierarchically Porous Alumina Spheres as Bifunctional Nanomaterials for Hydrodesulfurization and Energy Storage Applications". Catalysts 12, n.º 8 (19 de agosto de 2022): 913. http://dx.doi.org/10.3390/catal12080913.

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In this work, CoMoS catalysts were synthesized onto porous alumina spheres obtained using Pluronic P-123 (PS) or urea (US) and used as bifunctional nanomaterials for two energy applications: hydrodesulfurization and energy storage. For the first application, the catalysts were assessed in a hydrodesulfurization reactor using two model sulfur molecules, dibenzothiophene and 4,6-dimethyl dibenzothiophene, as well as feeding a heavy oil fraction. The results indicated that the spheres obtained by Pluronic P-123 allowed a greater dispersion degree of MoS2 slabs than US, indicating that the size and hierarchically porous structure of alumina spheres played a principal role as a booster of the HDS catalytic efficiency of DBT, 4,6 DMDBT and diesel fuel. Then, these catalysts were used for the electrocatalysis of the oxygen reduction and oxygen evolution reactions (ORR/OER), which take place in rechargeable Zn-air batteries. For the ORR, the CoMoS catalyst on PS in the presence of a conductive support (N-doped carbon nanotubes + graphene) displayed an overpotential of only 90 mV in comparison with Pt/C. Importantly, the chalcogenide enabled an increase in the stability, maintaining almost two times higher current retention than Pt/C for the ORR and IrO2/C for the OER. These results suggest that expended chalcogenides from the hydrodesulfurization industry can have a second life as co-catalysts for renewable energy storage systems, enabling a circular economy.
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Dong, Chengwu, Changlong Yin, Tongtong Wu, Zhuyan Wu, Dong Liu y Chenguang Liu. "Acid Modification of the Unsupported NiMo Catalysts by Y-Zeolite Nanoclusters". Crystals 9, n.º 7 (4 de julio de 2019): 344. http://dx.doi.org/10.3390/cryst9070344.

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Unsupported NiMo catalyst has high hydrogenation activity due to its high active site distribution. However, low specific surface area and pore distribution greatly limit the efficient utilization of the active components. The Y-zeolite nanoclusters were hydrothermally synthesized and introduced into the unsupported NiMo catalysts from a layered nickel molybdate complex oxide. The XRD, N2 adsorption-desorption, FT-IR, Py-IR, SEM, NH3-TPD, and TEM were used to characterize all catalysts. The dibenzothiophene (DBT) hydrodesulfurization (HDS) reaction was performed in a continuous high pressure microreactor. The results showed that the specific surface area, pore volume, and average pore size of the unsupported NiMo catalysts were greatly increased by the Y-zeolite nanoclusters, and a more dispersed structure was produced. Furthermore, the Lewis acid and total acid content of the unsupported NiMo catalysts were greatly improved by the Y-zeolite nanoclusters. The HDS results showed that the unsupported NiMo catalysts modified by the nanoclusters had the same high desulfurization efficiency as the unmodified catalyst, but had more proportion of direct desulfurization (DDS) products. The results offer an alternative to reducing hydrogen consumption and save cost in the production of ultra clean diesel.
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Song, Hua, Fuyong Zhang, Nan Jiang, Maosen Chen, Feng Li y Zijin Yan. "Synthesis of an Ni2P catalyst supported on Na-MCM-41 with highly activity for dibenzothiophene HDS under mild conditions". Research on Chemical Intermediates 44, n.º 9 (9 de abril de 2018): 5285–99. http://dx.doi.org/10.1007/s11164-018-3423-z.

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