Literatura académica sobre el tema "Mixed (NI)MoW catalysts"
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Artículos de revistas sobre el tema "Mixed (NI)MoW catalysts":
Paraguay-Delgado, F., R. García-Alamilla, J. A. Lumbreras, E. Cizniega y G. Alonso-Núñez. "Synthesis of Ni-Mo-W Sulfide Nanorods as Catalyst for Hydrodesulfurization of Dibenzothiophene". Journal of Nanoscience and Nanotechnology 8, n.º 12 (1 de diciembre de 2008): 6406–13. http://dx.doi.org/10.1166/jnn.2008.18398.
Nikulshina, M. S., P. Blanchard, A. Mozhaev, C. Lancelot, A. Griboval-Constant, M. Fournier, E. Payen et al. "Molecular approach to prepare mixed MoW alumina supported hydrotreatment catalysts using H4SiMonW12−nO40 heteropolyacids". Catalysis Science & Technology 8, n.º 21 (2018): 5557–72. http://dx.doi.org/10.1039/c8cy00672e.
El-Shobaky, G. A. y A. N. Al-Noaimi. "Surface properties of Ni-Al mixed oxide catalysts". Surface Technology 26, n.º 3 (noviembre de 1985): 235–44. http://dx.doi.org/10.1016/0376-4583(85)90120-7.
Nikulshina, Maria, Alexander Mozhaev, Christine Lancelot, Maya Marinova, Pascal Blanchard, Edmond Payen, Carole Lamonier y Pavel Nikulshin. "MoW synergetic effect supported by HAADF for alumina based catalysts prepared from mixed SiMonW12-n heteropolyacids". Applied Catalysis B: Environmental 224 (mayo de 2018): 951–59. http://dx.doi.org/10.1016/j.apcatb.2017.11.049.
Al-Doghachi, Faris Jasim, Ali M. A. Al-Najar, M. Safa-Gamal y Yun Hin Taufiq-Yap. "Catalytic Dry-reforming of Methane Process with Co,Ni,Pd/Ca-La-O Mixed Oxides". Bulletin of Chemical Reaction Engineering & Catalysis 18, n.º 4 (21 de noviembre de 2023): 675–87. http://dx.doi.org/10.9767/bcrec.20053.
Conte, Francesco, Serena Esposito, Vladimiro Dal Santo, Alessandro Di Michele, Gianguido Ramis y Ilenia Rossetti. "Flame Pyrolysis Synthesis of Mixed Oxides for Glycerol Steam Reforming". Materials 14, n.º 3 (31 de enero de 2021): 652. http://dx.doi.org/10.3390/ma14030652.
Görlin, Mikaela, Petko Chernev, Paul Paciok, Cheuk-Wai Tai, Jorge Ferreira de Araújo, Tobias Reier, Marc Heggen, Rafal Dunin-Borkowski, Peter Strasser y Holger Dau. "Formation of unexpectedly active Ni–Fe oxygen evolution electrocatalysts by physically mixing Ni and Fe oxyhydroxides". Chemical Communications 55, n.º 6 (2019): 818–21. http://dx.doi.org/10.1039/c8cc06410e.
Stoyanova, M., St Christoskova y M. Georgieva. "Mixed Ni-Mn-oxide systems as catalysts for complete oxidation". Applied Catalysis A: General 249, n.º 2 (agosto de 2003): 285–94. http://dx.doi.org/10.1016/s0926-860x(03)00228-x.
Stoyanova, M., St Christoskova y M. Georgieva. "Mixed Ni-Mn-oxide systems as catalysts for complete oxidation". Applied Catalysis A: General 249, n.º 2 (agosto de 2003): 295–302. http://dx.doi.org/10.1016/s0926-860x(03)00229-1.
Ovejero, G., A. Rodríguez, A. Vallet, P. Gómez y J. García. "Catalytic wet air oxidation with Ni- and Fe-doped mixed oxides derived from hydrotalcites". Water Science and Technology 63, n.º 10 (1 de mayo de 2011): 2381–87. http://dx.doi.org/10.2166/wst.2011.513.
Tesis sobre el tema "Mixed (NI)MoW catalysts":
Kokliukhin, Aleksandr. "Catalyseurs sulfures (Ni)MoW massiques et supportés, préparés à partir d'hétéropolyacides mixtes de Keggin H4SiMonW12-nO40, pour l'hydrotraitement des coupes lourdes". Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR024.
Refiners have to face the strengthening of environmental requirements for the sulfur content in fuels together the use of heavier crude oil for producing market fuels using hydrotreatment catalytic processes. One of the approaches to improve catalytic activity is the development of bulk and supported ternary NiMoW sulfide catalysts following the recent introduction of industrial mixed bulk NiMoW catalysts NEBULA and Celestia. Previously, for supported alumina catalysts, the use of mixed precursors, H4SiMo1W11O40 and H4SiMo3W9O40 Keggin heteropyacids, has shown a better positive effect on the formation of a highly active mixed MoWS phase than the use of two corresponding monometallic H4SiMo12O40 and H4SiMo12O40 precursors. In this study, a new protocol for the synthesis of mixed Keggin-type H4SiMonW12-nO40 precursors with n = 6 and 9 has been developed. The new compounds were characterized by IR and Raman spectroscopy, as well as single-crystal XRD. Bulk and supported hydrotreating catalysts based on the whole series of H4SiMonW12-nO40 HPAs were synthesized. The influence of the atomic Mo/(Mo+W) ratio on the composition and structure of the active phase and its effect on the catalytic activity of unpromoted alumina supported catalysts in model hydrotreating reactions (hydrodesulfurization of dibenzothiophene and hydrogenation of naphthalene) were studied in detail. It was found that for an atomic Mo/(Mo+W) ratio equal to 0.25 and 0.5, the structure of the active phase under gas-phase sulfidation conditions is a core-shell structure, according to HAADF. A further increase in the molybdenum content up to 0.75 leads to disordering of the active phase structure, which has a negative effect on the catalytic activity. In contrast, for the catalysts obtained from a mixture of monometallic H4SiMo12O40 and H4SiMo12O40 HPAs, the active phase consisted mainly of monometallic MoS2 and WS2 crystallites, regardless of the atomic Mo/(Mo+W) ratio, as a result of which the catalysts showed lower activity compared to the samples prepared from mixed HPAs.The study of the influence of atomic Mo/(Mo+W) ratio for Ni-promoted systems, under the liquid-phase sulfidation in order to be as close as possible to industrial conditions, is also reported. It was shown that the introduction of Ni does not prevent the formation of a mixed MoWS active phase, which was confirmed by HAADF and EXAFS. Moreover, testing in the presence of a nitrogen-containing component made it possible to further study the inhibition on catalytic reactions. It was found that tungsten-rich NiMoW/Al2O3 catalysts are more resistant to the action of nitrogen-containing compounds indicating that the choice of the catalyst composition should be adapted to the composition of the processed feedstock.The use of acid (HF) etching of the alumina support made it possible to obtain from sulfided MonW12-n/Al2O3 samples bulk MoWS catalysts with an active phase concentration of more than 90%. ToF-SIMS and EXAFS showed that the mixed MoWS2 phase is present both in the catalysts synthesized from the mixed HPAs and in the samples obtained from the mixture of two HPAs. However, the concentration of mixed sulfides in the first case is much higher, due to the fact that mixed crystallites have already been formed, whereas in the case of a mixture of two HPAs, a mixed phase is formed as a result of the sintering of particles during re-sulfidation. The high concentration of mixed sulfides made it possible to provide a higher activity of catalysts in model reactions.Replacing alumina with mesostructured silica made it possible to increase the activity of unpromoted MoW catalysts. At the same time, similar values of the degree of sulfidation and dispersion, as well as the results of catalytic tests, seem to indicate that the formation of mixed MoWS2 phase does not occur on this type of supports, which requires additional research to be confirmed
Nikulshina, Kulikova Maria. "(Ni)MoWS alumina supported hydrotreating catalysts prepared from mixed H4SiMonW12-nO40 heteropolyacids". Thesis, Lille 1, 2018. http://www.theses.fr/2018LIL1R015/document.
Developing highly active HDS catalysts has been one of the most challenging and important subjects because of strengthening of environmental requirements for the sulfur content in fuels. One of the approaches to improve catalytic activity is the development of ternary NiMoW catalysts. This investigation focuses on the synthesis and characterization of (Ni)MoW catalysts prepared by using mixed SiMo1W11 and SiMo3W9 heteropolyacids (HPA) with Keggin structure. For comparison purposes, catalysts based on monometallic SiMo12 and SiW12 HPAs and their mixtures were also prepared and studied. The samples were characterized by Raman spectroscopy, X-ray Photoelectron Spectroscopy, HRTEM. The catalytic properties were evaluated in HDS, HYD and HDN reactions. The physical-chemical properties and catalytic activity depends on the nature of the initial precursors. Genesis of the active phase was studied during in situ H2S/H2 sulfidation of the catalysts by X-ray absorption at SOLEIL Synchrotron. It was found that W transformation from mixed molecular precursors with a Mo-W nanoscale proximity is faster than from mixture of two HPAs resulting in simultaneously sulfidation of metals and the formation of mixed MoWS2 phase. The presence of mixed (Ni)MoxW1-xS2 slabs when mixed HPAs were used for preparation of the catalyst was evidenced by EXAFS and High angle annular dark field scanning transmission electron microscopy. Substitution of one or three tungsten atoms by molybdenum ones in the case of mixed HPAs resulted in a significant increase in HDS as well as in HYD activity, compared to those obtained for catalysts prepared from mixture of monometallic HPAs
Nikulshina, Kulikova Maria. "(Ni)MoWS alumina supported hydrotreating catalysts prepared from mixed H4SiMonW12-nO40 heteropolyacids". Electronic Thesis or Diss., Université de Lille (2018-2021), 2018. http://www.theses.fr/2018LILUR015.
Developing highly active HDS catalysts has been one of the most challenging and important subjects because of strengthening of environmental requirements for the sulfur content in fuels. One of the approaches to improve catalytic activity is the development of ternary NiMoW catalysts. This investigation focuses on the synthesis and characterization of (Ni)MoW catalysts prepared by using mixed SiMo1W11 and SiMo3W9 heteropolyacids (HPA) with Keggin structure. For comparison purposes, catalysts based on monometallic SiMo12 and SiW12 HPAs and their mixtures were also prepared and studied. The samples were characterized by Raman spectroscopy, X-ray Photoelectron Spectroscopy, HRTEM. The catalytic properties were evaluated in HDS, HYD and HDN reactions. The physical-chemical properties and catalytic activity depends on the nature of the initial precursors. Genesis of the active phase was studied during in situ H2S/H2 sulfidation of the catalysts by X-ray absorption at SOLEIL Synchrotron. It was found that W transformation from mixed molecular precursors with a Mo-W nanoscale proximity is faster than from mixture of two HPAs resulting in simultaneously sulfidation of metals and the formation of mixed MoWS2 phase. The presence of mixed (Ni)MoxW1-xS2 slabs when mixed HPAs were used for preparation of the catalyst was evidenced by EXAFS and High angle annular dark field scanning transmission electron microscopy. Substitution of one or three tungsten atoms by molybdenum ones in the case of mixed HPAs resulted in a significant increase in HDS as well as in HYD activity, compared to those obtained for catalysts prepared from mixture of monometallic HPAs
Nardi, Giulia. "Synthesis, characterization and testing of catalysts for the methanation and steam reforming of methane reactions". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.
Görlin, Eva Mikaela Charlotte [Verfasser], Peter [Akademischer Betreuer] Strasser, Peter [Gutachter] Strasser, Holger [Gutachter] Dau y Karl [Gutachter] Mayrhofer. "Structure-activity investigations of mixed Ni-Fe oxides as catalysts for electrochemical water splitting / Eva Mikaela Charlotte Görlin ; Gutachter: Peter Strasser, Holger Dau, Karl Mayrhofer ; Betreuer: Peter Strasser". Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156270375/34.
Lin, Li-Chun y 林力雋. "Mixed oxide supported Ni catalysts for mid-temperature methane steam reforming". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/99934689395595368072.
國立臺灣科技大學
化學工程系
104
Hydrogen is a possible choice for future energy supplies. Hydrogen mainly comes from the steam reforming of methane (SRM), which contains a high ratio of H/C = 4. Industrial SRM operating temperature is around 700~900℃, but high temperature increase energy consumption and process stability. Therefore, the SRM at mid-temperatures (400–600°C) is examined in this study. A series of La2O3-ZrO2-CeO2-mixed oxide is studied as the support for Ni catalysts. Increase in CeO2 content results in increased activity and stability at ≦500℃. The prepared Ni/LZC, with La:Zr:Ce = 1:1:1 (mole), catalysts readily catalyzed SRM and can reach equilibrium conversion starting from 400°C at WHSV = 2 h-1. The best-performed Ni/LZC provides high H2 yield of around 4 and low CO selectivity of less than 5% and the catalyst shows no activity loss during SRM at 500°C for 24 hours. TGA demonstrate that carbon deposition is significantly suppressed on this catalyst. Moreover, XRD results show Ni particle size of around 10 nm when Ni content is as high as 40% and no particle agglomeration is observed after 24-h reaction test at 500°C. EXAFS analyses show a coordination number of Ni metal of around 6, which shows high Ni metal dispersion probably by enhance the interactions between Ni and the support.
Xu, Li-Ru y 徐麗茹. "Ni/SiO2 core-shell catalysts for catalytic hydrogen production from simulated mixed gas derived from the plastic waste gasification". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/38849247868882262098.
國立中興大學
環境工程學系所
103
Take into consideration of today’s global energy crisis to investage the simultaneous recycling of waste plastic and generation of renewable energy in this study. The mixed gas is created by the gasification of waste plastic to produce the clean energy-hydrogen. The H2 production ability has been considerably increased by using Ni/SiO2 core-shell catalyst. SiO2 prepared by Stöber process was used as supports to prepare nickel core-shell catalyst. This study evaluated the effect of SiO2 core particles in various solvents (methanol, ethanol and isopropanol) on the morphological features and catalytic performances of Ni/SiO2 core-shell catalysts. Ni/SiO2 core-shell catalysts were prepared by the deposition-precipitation method and it was applied to generate hydrogen from the simulated mixed gas derived from the plastic waste gasification. Different synthesis parameters on the production of Ni/SiO2 core-shell catalyst were investigated to improve the bonding strength between the Ni active phase and SiO2 support, enhance dispersion of Ni/SiO2 and reduce the the grain size of active phase. The physico-chemical properties of the Ni/SiO2 core-shell catalysts were characterized by means of the FESEM, XRD, FTIR, TEM, H2-TPR, and BET method. Solvents resulted in different particle size of SiO2 support. Due to the difference in dielectric constants of solvents influenced the SiO2 nucleation process by changing the electrostatic repulsion and Van der Waals force of interaction between particles. The particle size of the prepared SiO2 support is in the order: SiO2-methanol < SiO2-ethanol < SiO2-isopropanol. Because of the bigger dielectric constant of methanol resulted in the smallest particle size and largest specific surface area of SiO2 particles which showed good dispersion of Ni/SiO2 core-shell catalyst and bonding between the Ni active phase and SiO2 support. Previous researches reported that the amount of steam is a key role in the catalystic gasification plastic waste. Further investigation of feed composition with different amounts (0, 0.34, 0.75 g-H2O/h) effected the hydrogen generation of Ni/SiO2-Methanol catalyst. However, Ni/SiO2- Methanol showed no hydrogen production at 600oC in the absence of steam. The Ni/SiO2-M catalyst can benefit by understanding an incresed H2 production rate at high steam content (0.75 g-H2O/h) because of the water gas shift reaction tending to form H2 from CO and H2O. Besides, steam reforming of methane occurs under a high steam content and at a high reaction temperature. The stability of Ni/SiO2 catalyst prepared with methanol a long term stability test carried out for 280 minutes with a steam content of 0.75 g-H2O/h at 800oC. The overall research confirmed that the Ni/SiO2 core-shell catalyst prepared with methanol has a strong bonding between the active phase and support due to the abundant formation of nickel phyllosilicates. Ni/SiO2- Methanol exhibited better stability during long term stability test. Experimental results of hydrogen production indicated that the highest catalytic activity is achieved by Ni/SiO2-Methanol catalyst, which is effective in catalytic H2 production from simulated mixed gas derived from the plastic waste gasification. The hydrogen production rate is 181 mmol/g-h at 800oC and steam content (0.75 g-H2O/h).
Capítulos de libros sobre el tema "Mixed (NI)MoW catalysts":
Wei, L., J. Z. Gui, H. S. Ding, X. T. Zhang, H. Y. Li, L. Song, Z. L. Sun y L. V. C. Rees. "24-P-31-Aromatization of mixed-C4 hydrocarbons over HZSM-5 catalysts modified by Zn and Ni cations". En Studies in Surface Science and Catalysis, 279. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81613-x.
Actas de conferencias sobre el tema "Mixed (NI)MoW catalysts":
Shinkarev, Alexey. "NI-AL MIXED OXIDES AS CATALYSTS IN THE REACTIONS OF CONVERSION OF THE HIGHER ALKANES". En 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/1.4/s06.086.
Ramis, Gianguido, Guido Busca, Tania Montanari, Michele Sisani y Umberto Costantino. "Ni-Co-Zn-Al Catalysts From Hydrotalcite-Like Precursors for Hydrogen Production by Ethanol Steam Reforming". En ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2010. http://dx.doi.org/10.1115/fuelcell2010-33034.