Thematische Bibliographien / Zr oxidation ratio

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Auswahl der wissenschaftlichen Literatur zum Thema „Zr oxidation ratio“

Autor: Grafiati

Veröffentlicht am 24. Juni 2021

Zuletzt aktualisiert am 29. Juli 2025

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Zeitschriftenartikel zum Thema "Zr oxidation ratio"

Afonasenko, Tatyana N., Daria V. Yurpalova, Zakhar S. Vinokurov, et al. "The Formation of Mn-Ce-Zr Oxide Catalysts for CO and Propane Oxidation: The Role of Element Content Ratio." Catalysts 13, no. 1 (2023): 211. http://dx.doi.org/10.3390/catal13010211.

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The MnOх-ZrO2-CeO2 oxide catalysts were synthesized by co-precipitation method with varying (1) Zr/Zr + Ce molar ratio at constant manganese content of 0.3; (2) manganese content at constant Zr/Ce molar ratio of 1; (3) Mn/Mn + Zr molar ratio at constant Ce content of 0.5. Catalysts are characterized by XRD, N2 adsorption, TPR, and XPS. The catalytic activity of all the series was tested in the CO and propane oxidation reactions. In contrast to the variation of the manganese content, the Zr/Zr + Ce molar ratio does not significantly affect the catalytic properties. The dependence of the catalyt

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Lun, Huilin, Yi Zeng, Xiang Xiong, et al. "Oxidation behavior of non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution powders in air." Journal of Advanced Ceramics 10, no. 4 (2021): 741–57. http://dx.doi.org/10.1007/s40145-021-0469-y.

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AbstractMulti-component solid solutions with non-stoichiometric compositions are characteristics of ultra-high temperature carbides as promising materials for hypersonic vehicles. However, for group IV transition-metal carbides, the oxidation behavior of multi-component non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution has not been clarified yet. The present work fabricated four kinds of (Zr,Hf,Ti)Cx carbide solid solution powders by free-pressureless spark plasma sintering to investigate the oxidation behavior of (Zr,Hf,Ti)Cx in air. The effects of metallic atom composition on oxidation

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Lin, Yu-Tse, Wen-Chung Liu, and Chin-Chiuan Kuo. "Elevated-temperature dry sliding wear behaviors of dual-cathode HiPIMS TiN and TiZrN films." Emerging Materials Research 14, no. 1 (2025): 01–21. https://doi.org/10.1680/jemmr.24.00123.

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Titanium–zirconium nitride films with three Zr / Ti ratios (16 / 35, 22 / 29, and 25 / 26) were deposited using Ti and Zr dual-cathode reactive high-power impulse closed-field magnetron sputtering by adjusting the average power ratio of two cathode materials. The sliding wear resistances of the obtained TiZrN films at different temperatures were compared. The results revealed that the ternary TiZrN film exhibited a higher hardness (approximately 35 GPa) and lower elastic modulus (approximately 360–380 GPa) than those of the binary TiN film. This contributed to the lower friction coefficient an

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Yoon, C. H., S. H. Cho, S. H. Kim, and S. R. Ha. "Catalytic wet air oxidation of p-nitrophenol (PNP) aqueous solution using multi-component heterogeneous catalysts." Water Science and Technology 43, no. 2 (2001): 229–36. http://dx.doi.org/10.2166/wst.2001.0094.

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This study investigated the decomposition of high strength p-nitrophenol (PNP) of 2,000 mg/l (3,400 mg of COD/1,250 mg of TOC) by catalytic wet air oxidation. Multi-component heterogeneous catalysts were used as catalysts for this purpose. The study results using a batch reactor showed that catalyst “D” (Mn-Ce-Zr 22.4 g plus CuSO4 1.0 g; Mn-Ce-Zr-Cu [CuSO4]) was more effective (56˜74%) than catalyst “A” (Mn-Ce-Zr 22.4 g) under the given conditions (O2 partial pressure of 1.0 MPa; temperature of 170˜190°C; 30 min of reaction time). The best result was obtained when 2 g of Mn-Ce-Zr-Cu [CuSO4] wa

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Ramos, Jesús Miguel, Jin An Wang, Sergio Odin Flores, et al. "Ultrasound-Assisted Hydrothermal Synthesis of V2O5/Zr-SBA-15 Catalysts for Production of Ultralow Sulfur Fuel." Catalysts 11, no. 4 (2021): 408. http://dx.doi.org/10.3390/catal11040408.

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This work reports the results of the ultrasound-assisted hydrothermal synthesis of two sets of V2O5 dispersed on SBA-15 and Zr doped SBA-15 catalysts used for the oxidation of dibenzothiophene (DBT) in a model diesel via the combination of oxidation, catalysis, and extraction technical route. These catalysts contained Lewis acidity as major and Brønsted acidity as minor. The amount of acidity varied with the content of vanadia and zirconium doping. It was found that DBT conversion is very sensitive to the Lewis acidity. DBT conversion increased by increasing the vanadium content and correlated

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Yugay, O. K., T. P. Mikhailovskaya, and K. A. Kadirbekov. "VAPOR-PHASE OXIDATION OF 2-METHYLPYRIDINEON V-Zr-O-CATALYSTS MODIFIED WITH TIN AND NIOBIUM OXIDES." Chemical Journal of Kazakhstan 79, no. 3 (2022): 101–9. http://dx.doi.org/10.51580/2022-3/2710-1185.83.

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Vapor-phase catalytic oxidation of pyridine alkyl derivatives is an effective method for obtaining a variety of physiologically active substances that are widely used in practice, as well as for the synthesis of solvents, starting materials for the production of dyes, herbicides, etc. For the process, a cheap oxidizing agent is used -atmospheric oxygen. Of great importance is the choice and creation of an active and selective process catalyst. Basically, the oxidation processes are carried out in the presence of catalysts based on vanadium oxide with the addition of transition metal oxides. Th

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Afonasenko, T. N., D. V. Glyzdova, V. L. Yurpalov, et al. "The Study of Thermal Stability of Mn-Zr-Ce, Mn-Ce and Mn-Zr Oxide Catalysts for CO Oxidation." Materials 15, no. 21 (2022): 7553. http://dx.doi.org/10.3390/ma15217553.

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MnOx-CeO2, MnOx-ZrO2, MnOx-ZrO2-CeO2 oxides with the Mn/(Zr + Ce + Mn) molar ratio of 0.3 were synthesized by coprecipitation method followed by calcination in the temperature range of 400–800 °C and characterized by XRD, N2 adsorption, TPR, TEM, and EPR. The catalytic activity was tested in the CO oxidation reaction. It was found that MnOx-CeO2, MnOx-ZrO2-CeO2, MnOx-ZrO2 catalysts, calcined at 400–500 °C, 650–700 °C and 500–650 °C, respectively, show the highest catalytic activity in the reaction of CO oxidation. According to XRD and TEM results, thermal stability of catalysts is determined b

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Jeong, Gu Beom, Pyung Woo Shin, and Sun Ig Hong. "Effect of Scrap: Sponge Ratio on Mechanical and Corrosion Properties of Zr-1Nb-0.7Sn-0.1Fe Alloy." Advanced Materials Research 977 (June 2014): 94–98. http://dx.doi.org/10.4028/www.scientific.net/amr.977.94.

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In this study, the effect of scrap ratio on the mechanical and corrosion properties of Zr-1Nb-0.7Sn-0.1Fe alloy was studied. Oxygen content in the ingot cake increased rapidly with increasing fraction of scrap, which can be attributed to the surface oxide of scrap cake made of small pieces of turning, chips, etc. Iron content was not changed much, suggesting scrap materials was well reserved in the iron-free container. As-cast structure of Zr-1Nb-0.7Sn-0.1Fe alloy with the scrap:sponge ratio displayed basket-weave α phase and no appreciable change of the cast structure was observed with change

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Kaplin, Igor Yu, Ekaterina S. Lokteva, Artem V. Tikhonov, Konstantin I. Maslakov, Oksana Ya Isaikina, and Elena V. Golubina. "Copper–Cerium–Tin Oxide Catalysts for Preferential Oxidation of CO in Hydrogen: Effects of Synthesis Method and Copper Content." Catalysts 12, no. 12 (2022): 1575. http://dx.doi.org/10.3390/catal12121575.

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Copper was incorporated into the Ce-Sn and comparative Ce-Zr oxide supports by one-pot precipitation in the presence of CTAB template and by the impregnation of templated Ce-Sn and Ce-Zr oxides. The synthesized Cu-Ce-Sn and Cu-Ce-Zr catalysts were tested in the continuous-flow preferential oxidation of CO in hydrogen excess. The one-pot synthesized tin- and zirconium-doped catalysts demonstrated better CO conversion and CO2 selectivity than their impregnated counterparts. For the tin-modified ternary system that showed the best catalytic performance, the copper content was further optimized. T

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Sytchenko, Alina D., Pavel A. Loginov, Alla V. Nozhkina, Evgeny A. Levashov, and Philipp V. Kiryukhantsev-Korneev. "Structure and Oxidation Resistance of Mo-Y-Zr-Si-B Coatings Deposited by DCMS and HIPIMS Methods Using Mosaic Targets." Journal of Composites Science 7, no. 5 (2023): 185. http://dx.doi.org/10.3390/jcs7050185.

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In this study, Mo-(Y,Zr)-Si-B coatings were obtained by direct current magnetron sputtering (DCMS) and high-power impulse magnetron sputtering (HIPIMS) using mosaic targets. The results showed that the addition of Y and Zr into the composition of Mo-Si-B coatings led to the suppression of columnar grain growth, a decrease in the crystallite size of h-MoSi2 phase from ~50 to ~5 nm, and an increase in the amorphous to crystalline phases ratio Doping of the Mo-Si-B coating with Y and Zr promoted an increase in oxidation resistance at a temperature of 1000 °C. The introduction of yttrium into the

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Dissertationen zum Thema "Zr oxidation ratio"

Zhao, Yuer. "A Numerical Study of Melt Pool Heat Transfer in the IVR of a PWR." Thesis, KTH, Fysik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-297867.

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This thesis aims to provide the thermal condition of melt pool convection by CFD simulation, which is important to the assessment of the invessel melt retention (IVR) strategy widely adopted in Generation III pressurized water reactors (PWRs). As a severe accident mitigation measure, the IVR strategy is realized through external cooling of the lower head of a reactor pressure vessel (RPV). To achieve the coolability and retention of the corium pool in the RPV lower head, the heat flux at the outer surface of the vessel should be less than the critical heat flux (CHF) of boiling around the lowe

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Konferenzberichte zum Thema "Zr oxidation ratio"

Vedel, Dmytro, and Petro Mazur. "Oxidation Resistance of (Zr, Hf)B2 Solid Solution." In International Young Scientists Conference on Materials Science and Surface Engineering. Karpenko Physico-Mechanical Institute of the NAS of Ukraine, 2023. http://dx.doi.org/10.15407/msse2023.155.

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The oxidation resistance of the ZrB2-HfB2 solid solutions in the temperature range of 1500-1600оС was carried out. The solid solutions have a higher oxidation resistance than individual phases due to the thin oxide layer. The highest oxidation was observed in solid solutions close to HfB2, due to the formation oxide phases with a low diffusion rate of oxygen into the material. The main oxidation mechanism is the reaction of a diboride-based solid solution with oxygen and the formation of an oxide-based solid solutions with saving the Zr/Hf ratio.

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He, Xiaoqiang, Hongxing Yu, and Guangming Jiang. "Reflood Oxidation Model Based on Reaction-Diffusion Equations." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-30030.

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An important accident management measure in PWRs is the injection of water to cool the degrading core, in which process the temperature and hydrogen production will significantly increase due to enhanced oxidation after shattering of zircaloy fuel rod. This phenomenon can be described by Zr oxidation model and shattering model. The process of Zr oxidation is usually represented by parabolic rate correlations. But, after consumption of primary β-Zr, or in steam starvation conditions, the correlation approach is restricted. Besides, using this approach, it is impossible to obtain detailed oxygen

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