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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 7 of 7 (0.069 seconds)| 1 |
Oxidative coupling of methane on samaria and on mixed oxide catalystsHamid, Hamzah b Abd January 1991 (has links)
No description available.
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Studies on non-oxidative conversion of methane and ethane over metal oxide photocatalysts / 酸化物光触媒上でのメタンおよびエタンの非酸化的転化反応の研究Singh, Surya Pratap 23 March 2022 (has links)
京都大学 / 新制・課程博士 / 博士(人間・環境学) / 甲第23976号 / 人博第1028号 / 新制||人||242(附属図書館) / 2022||人博||1028(吉田南総合図書館) / 京都大学大学院人間・環境学研究科相関環境学専攻 / (主査)教授 吉田 寿雄, 教授 田部 勢津久, 教授 中村 敏浩 / 学位規則第4条第1項該当 / Doctor of Human and Environmental Studies / Kyoto University / DFAM
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CONVERSION OF SHALE GAS WITH SUPPORTED METAL CATALYSTSJohnny Zhuchen (9109742) 27 July 2020 (has links)
<div>As shale gas exploitation has been developed, production of shale gas in the US has rapidly increased during the last decade. This has motivated the development of techniques to covert shale gas components (mainly C<sub>1</sub> to C<sub>3</sub>) to liquid fuels by catalytic conversion. The main goal of the dissertation is to study the geometric and electronic structures of the metal catalysts, which are crucial for understanding the structure-property relationship.</div><div><br></div><div><div>The fi?rst project studies bimetallic Pt-Bi catalyst for non-oxidative coupling of methane. In a recent publication published in ACS catalysis, Pt-Bi/ZSM-5 catalyst</div><div>has been shown to stably convert methane into C2 for 8 hours under non-oxidative conditions. In this thesis, structure of the Pt-Bi/ZSM-5 was shown with HAADF</div><div>imaging, synchrotron XAS and XRD. A new surface cubic Pt<sub>3</sub>Bi phase on Pt nanoparticles with Pt-Bi bond distance of 2.80 A was formed. Formation of noble metal intermetallic alloys such as Pt<sub>3</sub>M may be the clue for non-oxidative conversion of methane.</div></div><div><br></div><div><div>The second and third project highlight strong metal-support interaction catalysts for propane dehydrogenation. Chemisorption showed partial coverage of the SMSI oxides</div><div>on the surface of the nanoparticles. In situ X-ray absorption near edge (XANES), resonant inelastic X-ray scattering (RIXS), X-ray photoelectron spectroscopy (XPS)</div><div>have shown that little electronic effect on the metal nanoparticles. The catalyst activity per mol of metal decreased due to the partial coverage of the SMSI oxides on the surface of the catalysts. The catalysts, however, had higher selectivity due to smaller ensembles inhibiting hydrogenolysis.</div></div><div><br></div><div><div>In the fourth project Pt-P catalyst was investigated to understand the promoting effect of P.Pt-P catalysts had much higher selectivity for propane dehydrogenation</div><div>(>95%). These give two types of catalysts, a PtP<sub>2</sub>-rich surface on Pt core and full PtP<sub>2</sub> ordered structure, which were con?rmed by scanning transmission electron microscopy (STEM), and in situ methods of EXAFS, synchrotron XRD, XPS, and Resonant Inelastic X-ray Spectroscopy (RIXS). The PtP<sub>2</sub> structure has isolated Pt</div><div>atoms separated by P<sub>2 </sub>atoms. In addition XANES, XPS and RIXS indicate a strong electronic modi?cation in the energy of the valence orbitals.</div></div><div><br></div><div><div>It can be concluded from the Pt-Bi catalyst that intermetallic alloys might be selective for NOCM. Therefore, promoters with higher reduction temperature, such as Mn and Cr, should be used to have stable catalysts at high temperature. Moreover, both Pt-Bi and Pt/CeO<sub>2 </sub>suggest that selective catalysts for propane dehydrogenation and NOCM may have some correlation. Further studies would be conducted to understand the correlation between the two reactions.</div></div>
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Investigation of Chemical Looping Oxygen Carriers and Processes for Hydrocarbon Oxidation and Selective Alkane Oxidation to ChemicalsChung, Elena Yin-Yin 28 December 2016 (has links)
No description available.
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Study on methane conversion to synthesis gas over nano Pt/MgO catalysts III: Influence of the precursors on the physico-chemical properties of the catalystsYang, Min, Papp, Helmut 25 July 2022 (has links)
Using different precursors, two series of nano Pt/MgO catalysts (Pt-II and Pt-IV,
respectively) loaded with Pt in a wide range from 0.1 wt% to 2.2 wt% were prepared by using
wet impregnation methods. The physico-chemical properties of catalysts were characterized by
using BET, XRD, TPD-CO2, and other techniques. The results revealed that the precursor and
content of Pt, especially the acid/base properties of the precursor solution, had a big influence
on the structure, and surface properties of the catalysts. The loaded Pt is in metallic state in all
the catalysts calcined at 1073 K. The Pt-II catalysts had larger surface areas and relatively
narrow pore size distribution range. The MgO crystals in the calcined Pt-II-3 catalyst had more
regular structure than that in the calcined Pt-IV-3 catalyst.
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EXPLORING CATALYSTS AND SUSTAINABLE PROCESSES FOR EFFICIENT ENERGY CONVERSION AND STORAGELi, Jialu 26 July 2023 (has links)
No description available.
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Reasons for the Underperformance of Clean Development Mechanism Project Activities in the Animal Waste Management Sector / An Analysis of Swine Manure treating Facilities in Latin America / Ursachen des geringen Erfolgs von Abwasserbehandlungsprojekten in der Tierproduktion im Rahmen des Clean Development Mechanism / Eine Analyse von Schweineproduktionsbetrieben in LateinamerikaDeecke, Imme Dorothea 04 February 2010 (has links)
No description available.
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