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Reduction of nitrogen oxides from the flue gas stream on catalysts under non-standard conditions
Minář, Marek ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
The objective of the presented diploma thesis is reduction of nitrogen oxides from the flue gas stream on catalyst under non-standart conditions. Emphasis is places on the description of selected pollutants in flue gas (especially nitrogen oxides), legislative requirements for air protection and technologies for removal of nitrogen oxides, expecially methods of selective catalytic and non-catalytic reduction. The practical part is devoted to the reduction of nitrogen oxides by selective catalytic reduction on a pilot plant INTEQ II in the laboratory NETME Center. The subject of interest is the determination of the NOx reduction efficiency depend on the temperature for selected catalyst. The end of the practical part pursues with comparison of measurement results and their evaluation.
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Catalytic oxidation of VOC on commercially available catalysts
Osička, Tomáš ; Jecha, David (referee) ; Brummer, Vladimír (advisor)
The main topic of this thesis is a catalytic oxidation which belongs to a group of modern technologies for removing emission of CO and VOC from waste air. In the introduction of this thesis, the basic concepts are defined. Further the legislative requirements associated with VOC emissions, emission limits and conditions are summarized. Described destructive and non-destructive methods for removing VOCs from waste gases are also briefly described. Increased attention is paid to the catalytic oxidation as the main theme of the thesis. It was searched for industrial applications where the catalytic oxidation is used. Another chapter is devoted to the theoretical analysis of kinetics of catalytic oxidation reactions. Firstly, the basic types of reactors are described and also material balance and reaction rate for the isothermal and adiabatic reactor. In the experimental part results of performed kinetic measurements on a pilot unit for catalytic commonly used organic solvents (VOCs) using commercially available catalysts were summarized. Pre-exponential factors and activation energies for sprinkling catalysts EnviCat VOC-5565 and EnviCat 55068 for substances ethanol, toluene and acetone were determined. "Light-off" curves for these substances and methane were measured and on sprinkled catalyst EnviCat 55068 and on monolithic catalyst Purelyst PH-304.
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Ionexchange membranes for fuel cells
Chladil, Ladislav ; Špičák, Petr (referee) ; Barath, Peter (advisor)
Bachelor’s thesis engages in the analysis of ionexchange polymer electrolytes for low-temperature fuel cell’s H2-O2 application. Object of this work was made a several version of function ionexchange membranes with electrode material by MEA technique. The theoretical part is deal of problems of the fuel cell and their application. Experimental part describes the process of preparation of electrode materials, which were doped by platinum catalyst in variable subsidy. Electrode substances were deposited on various ionexchange membranes. This function elements were measured in experimental fuel cell Quintech and measured results was evaluated.
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Development and analysis of a database of reactions catalyzed by cytochrome P450 enzymes for machine learning applications
Komorníková, Natália ; Pluskal, Tomáš (advisor) ; Berka, Karel (referee)
Cytochrome P450 enzymes are hemoproteins showing extraordinary di- versity in the reactions they catalyze. We developed a database containing all the needed data to provide a comprehensive data source on reactions cat- alyzed by cytochrome P450 enzymes. This data mainly includes information about the substrates, products of characterized reactions, and the sequence of these enzymes. The database was developed by collecting data from reliable protein and reaction databases like UniProt and RHEA. The work presents an in-depth analysis of the created database of reactions catalyzed by cy- tochrome P450 enzymes. This database can be utilized for future machine learning approaches to predict the function of uncharacterized cytochrome P450s.
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Synthesis of ligands and reductive coupling catalysts
Žáková, Andrea ; Hulla, Martin (advisor) ; Schulz, Jiří (referee)
This thesis investigates Frustrated Lewis pair hydrogenation catalysts for the use in reductive amination reactions. A series of tin complexes using Schiff base ligands was synthetized. Their ability to act as Lewis acids in Frustrated Lewis pair catalysis was disclosed by series of experiment including Gutmann Beckett method, H2 activation using high pressure NMR measurements and hydrogenation catalytic testing. Synthetized ditriflate and monotriflate complexes were proven to reversibly activate H2 at room temperature and 60 řC respectively. All of the synthetized compounds successfully mediated imine hydrogenation confirming Frustrated Lewis pairs catalysis.
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Web Interface for the Treex Framework
Sedlák, Michal ; Popel, Martin (advisor) ; Rosa, Rudolf (referee)
This work deals with a web application called Treex::Web which serves as a web interface for NLP framework Treex. The work addresses several Treex issues (e.g. absence of graphical user interface and complicated installation) and offers Treex::Web as a possible solution. At the beginning of this work we introduce the Treex framework itself. The following chapters describe Treex::Web's user interface (chapter 3) and the implementation of the whole web application (chapter 4). Conclusion of this work includes a comparison of NLP frameworks similar to Treex and their web interfaces. 1
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An aftertreatment system for the passenger vehicles with a gasoline engine
Hána, Michal ; Fridrichová, Kateřina (referee) ; Böhm, Michael (advisor)
This thesis concentrates on the issue of reducing emissions from passenger vehicles with a gasoline engine. The introduction describes the individual emission components, their origin and impact on the environment and human organism. The main part of the thesis concentrates on possibilities of reducing emissions. The function and design solution for each component of the emission system is described. Furthermore, the specific solutions for several selected representatives from diverse vehicles categories are stated. These solutions are evaluated and custom configuration is designed given the selected parameters. In the conclusion are summarised the results of the thesis.
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Syngas composition influence on gas cleaning efficiency
Menšíková, Barbora ; Lisý, Martin (referee) ; Baláš, Marek (advisor)
The diploma thesis deals with the issue of pollution of the generated gas after the gasification process and its subsequent cleaning using a barrier filter. The theoretical part of thesis consists of research on the gasification process, the effects on the gasification process, pollutants in the gas and gas cleaning with a focus on the purification of gas from tar. The experimental part of this thesis is devoted to the gasification itself in a fluidized bed gasification reactor in order to test the effect of the catalyst, which was calcined dolomite, the composition of the gas at variable parameters of water vapor and the temperature inside the laboratory filter.
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Reduction of nitrogen oxides from the flue gas stream on catalysts under non-standard conditions
Minář, Marek ; Brummer, Vladimír (referee) ; Jecha, David (advisor)
The objective of the presented diploma thesis is reduction of nitrogen oxides from the flue gas stream on catalyst under non-standart conditions. Emphasis is places on the description of selected pollutants in flue gas (especially nitrogen oxides), legislative requirements for air protection and technologies for removal of nitrogen oxides, expecially methods of selective catalytic and non-catalytic reduction. The practical part is devoted to the reduction of nitrogen oxides by selective catalytic reduction on a pilot plant INTEQ II in the laboratory NETME Center. The subject of interest is the determination of the NOx reduction efficiency depend on the temperature for selected catalyst. The end of the practical part pursues with comparison of measurement results and their evaluation.
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