Дисертації з теми "Catalyst for HAN decomposition"
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do, Nascimento Daniel Luis. "Olefin Metathesis Catalysts: From Decomposition to Redesign." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42541.
Повний текст джерелаNorooz, Oliaee Shirin. "Catalyst Development and the Structure-Dependent Properties for Hydrazine Decomposition." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1468618168.
Повний текст джерелаMalich, Ashley M. "Decomposition of Novel Diazosugars: Effects on Regioselectivity." Youngstown State University / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1222195006.
Повний текст джерелаChai, Wai Siong. "Characterization & analysis on electrolytic decomposition of hydroxylammonium nitrate (HAN) ternary mixtures in microreactors." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40544/.
Повний текст джерелаBailey, Gwendolyn Anne. "Inside the Cycle: Understanding and Overcoming Decomposition of Key Intermediates in Olefin Metathesis." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37501.
Повний текст джерелаRico, Pérez Verónica. "Optimization of N2O decomposition RhOx/ceria catalysts and design of a high N2-selective deNOx system for diesel vehicles." Doctoral thesis, Universidad de Alicante, 2013. http://hdl.handle.net/10045/35739.
Повний текст джерелаOkura, Kaname. "Studies on Ammonia Decomposition for Hydrogen Production over Ni Catalysts." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225614.
Повний текст джерелаHarada(Onishi), Chie. "Direct Decomposition of Nitrous Oxide over Alkali-doped Co3O4 Catalyst in the Presence of Oxygen." 京都大学 (Kyoto University), 2009. http://hdl.handle.net/2433/124545.
Повний текст джерелаPetty, Renee Lynn. "Catalytic Decomposition of Nitric Oxide and Carbon Monoxide Gases Using Nanofiber Based Filter Media of Varying Diameters." University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1279505229.
Повний текст джерелаIreland, Benjamin. "Amines in Olefin Metathesis: Ligands and Poisons." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34342.
Повний текст джерелаBrandt, Bjoern. "Selectivity in hydrocarbon conversions and methanol decomposition on a Pd/Fe 3 O 4 model catalyst." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2008. http://dx.doi.org/10.18452/15854.
Повний текст джерелаThe achievement of selectivity is one of the main objectives in chemistry. For catalysis, selectivity is generally seen to be closely linked with catalyst structure; the complex microscopic structure of real catalysts, however, obstructs to obtain a deeper understanding; for this reason, structurally simplified materials are studied. For the current work, studies have been conducted on a Pd/Fe3O4 model catayst. On this system, the selectivity in two catalytic reactions has been examined. The exposure of the reactants was effected by molecular beams in high vacuum, and the reaction rates have been measured mass spectrometrically; additionally, adsorbates were detected by IR-spectroscopy. - Decomposition of Methanol: It is shown that on the oxide Fe3O4 methanol is dehydrogenated very selectively to formaldehyde and water by reaction with surface oxygen of the oxide (Mars-van-Krevelen mechanism). On Pd metal it is mainly decomposed very quickly to carbon monoxide and hydrogen (and, in a side reaction, to carbonaceous deposits). Experiments are shown indicating that the diffusion of oxide-related methanol and methoxy to the Pd metal-particles contributes significantly to the overall activity of the model catalyst. - Conversion of 2-Butene with Deuterium: At first it is shown that the catalytic activity depends critically on the dissociative adsorption of the reactant deuterium, which is strongly inhibited by hydrocarbon adsorbates; it was, however, possible to overcome this limitation experimentally. In addition, it is shown that the hydrogenation reaction can be selectively induced in the presence of strongly dehydrogenated carbonaceous deposits, whereas the alternative reaction (H/D-exchange/isomerisation) can proceed also without the presence of those species; possible models for explanation are discussed. Finally, the possible origin of the different reaction rates with cis- and trans-2-butene that were observed only under certain reaction conditions is discussed.
MONTEIRO, FELIPE ZANONE RIBEIRO. "STUDY OF THE THERMAL DECOMPOSITION OF GREEN COCONUT FIBER IN THE PRESENCE OF A NANO STRUCTURED CATALYST." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2017. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=32928@1.
Повний текст джерелаCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Com aumento da preocupação político-ambiental, torna-se imperativo desenvolver processos eficientes em termos econômicos e energéticos para a produção sustentável de combustíveis e produtos químicos. A liquefação hidrotérmica (HTL) é um processo para a transformação de materiais orgânicos, tais como bio-resíduos ou biomassa, em óleo bruto, em temperaturas usualmente inferiores a 400 graus Celsius sob altas pressões na presença de água, e, dependendo do processo, de um catalisador. Nesse contexto, é importante entender o comportamento de degradação térmica do material em atmosfera inerte, no sentido de se investigar a possibilidade de quebra das cadeias poliméricas inicias em moléculas menores, que, mediante pressão, poderão ser convertidas em novos produtos. Assim sendo, os objetivos do presente trabalho estão associados ao estudo termogravimétrico (TG) da degradação térmica da fibra do coco verde na presença de ferrita de cobalto (Fe2CoO4), utilizada no intuito de gerar um efeito catalítico, acelerando a degradação térmica das estruturas poliméricas presentes, e, que possa ser usada posteriormente em uma rota HTL. Os catalisadores foram produzidos a 1000 graus Celsius em diferentes tempos de calcinação (3h, 6h e 9h), sendo, nas misturas com a fibra, a fração mássica de óxido igual a 50 por cento. As amostras de interesse para a pesquisa foram caracterizadas mediante diferentes técnicas, tais como, a microscopia eletrônica de varredura, para o estudo da morfologia e composição elementar, difração de raios X, para a quantificação das fases presentes nas amostras de ferrita, e espectroscopia de infravermelho, visando à identificação das principais ligações químicas nas fibras, tanto antes quanto durante o tratamento térmico. Dentre todos os ensaios de TG realizados, os experimentos com o catalisador calcinado durante 9h homogeneizado com gral de ágata foi o que mostrou uma melhor resposta com relação à degradação térmica das fibras. Os resultados sugerem ainda que, tanto o tempo de calcinação, quanto a natureza do processo de mistura apresentam efeitos significativos sobre a cinética de degradação.
With increasing political-environmental concern, it becomes imperative to develop efficient processes in economic and energy terms for the sustainable production of fuels and chemical products. Hydrothermal liquefaction (HTL) is a process for the transformation of organic materials such as bio-waste or biomass into crude oil at temperatures usually below 400 degrees Celsius under high pressures in the presence of water and, depending on the process, of a catalyst. In this context, it is important to understand the behavior of thermal degradation of the material under inert atmosphere, in order to investigate the possibility of breaking the initial polymer chains into smaller molecules, which, under pressure, can be converted into new products. The objectives of the present work are associated to the thermogravimetric study (TG) in the thermal degradation of the green coconut fiber in the presence of a cobalt ferrite (Fe2CoO4), used to generate a catalytic effect, accelerating the thermal degradation of the polymeric structures present, and which can be used later on an HTL route. The catalysts were produced at 1000 degrees Celsius at different calcination times (3h, 6h and 9h) and in the fiber mixtures, the oxide mass fraction was equal to 50 percent. The samples of interest for the research were characterized by different techniques, such as scanning electron microscopy, for the study of the morphology and elemental composition, X-ray diffraction, for the quantification of the phases present in the ferrite samples, and spectroscopy of Infrared, in order to identify the main chemical bonds in the fibers, both before and during the heat treatment. Among all the TG assays performed, the experiments with the catalyst calcined for 9h homogenized with mortar and pestle showed the best to the thermal degradation of the fibers. The results further suggest that both the calcination time and the nature of the blending process have significant effects on the degradation kinetics.
Reinicker, Aaron D. "High Throughput Study of the Structure Sensitive Decomposition of Tartaric and Aspartic Acid on Surfaces Vicinal to Cu(111) and Cu(100)." Research Showcase @ CMU, 2015. http://repository.cmu.edu/dissertations/572.
Повний текст джерелаGoudreault, Alexandre. "Roles for Nucleophiles and Hydrogen-Bonding Agents in the Decomposition of Phosphine-Free Ruthenium Metathesis Catalysts." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/40042.
Повний текст джерелаZhu, Zhaoxuan Zhu. "Control-oriented Modeling of Three-Way Catalyst Temperature via Projection-based Model Order Reduction." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1534271429299604.
Повний текст джерелаJones, Simon Philip. "Influence of modifiers on Palladium based nanoparticles for room temperature formic acid decomposition." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:873277f2-c4f7-45b7-a16d-bba064e24bee.
Повний текст джерелаSlosky, Lauren M. "Targeting the Cystine/Glutamate Antiporter System xc⁻ in Cancer-Induced Bone Pain." Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/594941.
Повний текст джерелаDavis, John D. Jr. "Spectroscopic Examination of the Catalytic Decomposition of hydrogen Peroxide by a Copper (II) Complex of a Dissymmetric Schiff Base and an Imidazole Derivative." Digital Commons @ East Tennessee State University, 2003. https://dc.etsu.edu/etd/801.
Повний текст джерелаJohar, Jasmeet Singh. "An experimental investigation of the urea-water decomposition and selective catalytic reduction (SCR) of nitric oxides with urea using V2O5-WO3-TiO2 catalyst." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2595.
Повний текст джерелаPeyrovi, Mohammad-Hassan. "Etude de la destruction du coke et de ses précurseurs en presence d'hydrogène sur catalyseurs à base de platine." Poitiers, 1987. http://www.theses.fr/1987POIT2038.
Повний текст джерелаMachado, Taís Espíndola. "Decomposição catalítica do metano sobre catalisador Cu-Ni-Al : taxa da reação e regeneração do catalisador." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/10051.
Повний текст джерелаHydrogen is considered the ideal source of energy, because its combustion doesn't generate pollutants, just water. The catalytic decomposition of methane stands out among the available processes for hydrogen production because, unlike steam reform and partial oxidation, in this route there is not production of CO. The objective of this work is the kinetic study and the reaction rate determination of methane catalytic decomposition over Cu-Ni-Al catalyst for pure hydrogen production. In order to determinate the limiting step, reaction was conducted using four catalyst particle size ranges and the Mears criterion was applied. The external diffusion effects and diffusion in porous catalysts step do not influence significantly the reaction rate in the studied conditions. The reaction was carried out in a thermobalance with different temperatures (500 to 600°C) and methane concentrations (0.5 to 1.2 mol m-3) to determining the reaction rate. It was observed that the reaction is of first order, with activation energy of 50655 J mol-1. The reaction also forms carbon, which is deposited on the catalyst surface causing deactivation. The carbon oxidation for catalyst regeneration was also investigated. Repeated reaction-regeneration cycles were carried out, being the regeneration composed by oxidation or by oxidation and reduction. The oxidation was carried out at different temperatures (500 to 600°C) and times (20 to 75min), with the reaction happening in severe conditions (600°C and methane concentration of 1.2 mol m-3). The best regeneration condition, that is, the condition that allows a larger number of cycles with low activity loss, it was determined. It was also observed that the deposited carbon is in the nanotubes form, which has exceptional properties. The structure of carbon nanotubes formed during the reaction was analyzed by Scanning Electron Microscopy (SEM).
Montagne, Xavier. "Caracterisation et reactivite des intermediaires reactionnels dans la decomposition du methanol a pression atmospherique." Paris 6, 1987. http://www.theses.fr/1987PA066020.
Повний текст джерелаBrunet, Sylvette. "Mode d'action des catalyseurs d'hydrodesazotation des coupes petrolieres : decomposition de quinoleines et d'anilines sur catalyseurs a base de sulfures de nickel et de molybdene." Poitiers, 1987. http://www.theses.fr/1987POIT2287.
Повний текст джерелаPane, Flavia. "Kinetic analysis of Phenol Steam Reforming over Rh and Ni-Co based catalysts: identification of reaction’s pathway." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Знайти повний текст джерелаSHIH, TUNG-PENG, and 石宗鵬. "Decomposition of Diisopropyl ether on CeO2/ZrO2 catalyst." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/82940275012654285977.
Повний текст джерела國立臺灣科技大學
化學工程系
97
In this study CeO2/ZrO2 catalysts were prepared by coprecipitation. The effects of Ce/Zr ratio and calcination temperature on catalyst activity were examined. The prepared catalysts were characterized by the use of XRD, N2-adsorption (BET), FTIR, TGA/DTA, NH3-TPD and ESCA. The activities of the catalysts were tested in a continuous flow micro reactor. The reaction was carried out at atmospheric pressure. The mass of the catalysts used in each reaction is fixed at 0.2 g. Diisopropyl ether (DIPE) is fed to the reactor accompanied by Ar as the balance gas. The Ar:DIPE mole ratio was fixed at 1:1.2 for each reaction. The product from the reactor were analyzed by a gas chromatograph and then using the data to calculated the conversion of DIPE and selectivity of isopropyl alcohol. The results showed that among the catalysts with Ce/Zr mole ratio of 1:9, 3:7 and 5:5 the 1:9 catalyst exhibited the highest activity. Between the catalysts calcined at 500℃ and 800℃. The 500℃ one displayed a higher DIPE conversion but lower IPA selectivity. The effects of reaction condition were investigated through the changes of reaction temperature, the introduction of water in the feed and the partial pressure of DIPE. For reaction between 140℃ and 190℃, low temperature resulted in low conversion and high selectivity. Incorporating water steam in the feed could yield a higher DIPE conversion but a lower product selectivity. Under a constant total pressure, decreasing the partial pressure of the reactant would decrease the DIPE conversion but increase the product selectivity. Severe deactivation of the catalysts was observed during the reaction. Carbon deposit was believed to be one of the causes for the deactivation. Comparing the catalyst calcined at 800 ℃ with that at 500 ℃, the former was more stable.
Chen, Jia-Hao, and 陳家豪. "Decomposition of Naphthalene Using Catalyst in Gas Phase." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/21751905590970215028.
Повний текст джерела國立臺灣大學
環境工程學研究所
92
The purpose of this study is to investigate the feasibility of the application of the catalytic incineration using Pt/γ-Al2O3 to decompose polycyclic aromatic hydrocarbons (PAHs) (taking naphthalene which is the simplest and least toxic PAH, as a target compound) generated from the waste gaseous stream or diesel engine emission to atmosphere. The relationships between conversion efficiency, operating parameters and influential factors, such as treatment temperatures, catalyst sizes, space velocities and ozone inlet concentrations have been examined. Also, the related kinetic model is proposed to describe the reaction mechanism. The results indicate that the catalyst of Pt/γ-Al2O3 used accelerates the reaction rate of decomposition of naphthalene, and decreases the reaction temperature. A high conversion (over 95%) can be achieved at the moderate reaction temperature of 480 K and space velocity below 35,000 hr-1. At the same operation condition, the reaction temperature needed is as high as over 1000 K to achieve conversion over 95% for the case without Pt/γ-Al2O3 catalyst. Therefore, the reaction temperature is a determining factor in the catalytic decomposition. CO2 is the major product obtained from the catalytic decomposition of naphthalene. When the conversion of naphthalene is higher than 95%, over 92% mineralization can be achieved at the reaction temperature of 505 K. Also, the results indicate that Rideal-Eley mechanism and Arrhenius equation can be reasonably applied to describe the data by using the pseudo-fist-order reaction kinetic equation. The activation energy (35.4 kcal/mol) and frequency factor (3.26 × 1017 s-1) are obtained therefore.
Khare, Prashant Yang Vigor. "Decomposition and ignition of han-based monopropellants by electrolysis." 2009. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-3475/index.html.
Повний текст джерелаChen, Mei-chun, and 陳玫君. "Perovskite-type oxides prepared as the catalyst for NO decomposition." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/91894568150296760160.
Повний текст джерела國立中央大學
環境工程研究所
100
Perovskite-type oxides including La2NiO4, LaSrNiO4, and La0.7Ce0.3SrNiO4 were prepared by the citric acid complexation and used as catalysts for direct decomposition of NO. Moreover, non-thermal plasma technology was applied after calcinations of La0.7Ce0.3SrNiO4. In this study, i.e., citric acid complexation (without plasma treatment), N2-plasma-treated, and air-plasma-treated catalysts were tested for NO decomposition to understand the effect of plasma treatment on the catalytic performance. The catalysts before and after plasma treatment were characterized, respectively, to discern the effects. The activities of La2NiO4, LaSrNiO4, and La0.7Ce0.3SrNiO4 for NO decomposition were tested and the results indicate that in the same experimental parameters, La0.7Ce0.3SrNiO4 catalyst is of the highest NO decomposition with Ar, with the efficiency up to 49.89%. The inlet NO concentration was controlled at 1000 ppm, and the reaction temperature ranged from 600℃ to 900 ℃, while the space velocity was fixed at 8,000h-1. The influences of oxygen content and water vapor content on NO decomposition were also explored. In the absence of O2, NO decomposition achieved is much higher as N2 is used as carrier gas compared with Ar. With 1% oxygen content in the gas stream, NO decomposition decreased slightly to 99.12% and 44.97%, respectively, as N2 and Ar are used as the carrier gases. The results indicate that the activation of catalyst was slightly suppressed with 1% O2 content. On the other hand, NO decomposition decreases rapidly as the oxygen content is increased to 3% and 6%. Non-thermal plasma is applied to modify the performance of perovskite-type oxides catalyst. The operating parameters are as following:gas flow rate is 1000 sccm, space velocity is 1241 h-1, the applied voltage is 16.5kV, and the discharge frequency is 100 Hz with either nitrogen or air as carieer gas. At 900℃, NO decomposition achieved with La0.7Ce0.3SrNiO4 catalyst before plasma treatment as N2 is used as carrier gas is much higher than that the catalyst after plasma treatment in the presence of 0% or 1% O2, however, as the oxygen content is increased to 3% and 6%, the La0.7Ce0.3SrNiO4 catalyst before plasma treatment activity is significantly decreased to 24.66% and 6.54%, respectively, as N2 is used as the carrier gas. The results lower than the La0.7Ce0.3SrNiO4 catalyst after plasma treatment with N2 as the carrier gas. As the oxygen content is increased to 3% and 6%, the N2-plasma-treatment catalyst activity is 36.45% and 17.81%, respectively, and air-plasma-treatment catalyst activity is 28.55% and 12.27%, respectively. The results indicate that the the catalysts after plasma treatment possess strong tolerance in the presence of 3% and 6% oxygen content.
Lee, Chun-Yuan, and 李俊淵. "Cu-YDC/Al2O3 CATALYST FOR METHANOL STEAM REFORMING AND METHANOL DECOMPOSITION." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/69270731760382644352.
Повний текст джерела大同大學
化學工程研究所
88
The objective of this research was to investigate the catalyst applied in methanol steam reforming and methanol decomposition, such that methanol would react to form hydrogen and monoxide. This experiment was based on copper catalyst to investigate the effects of oxygen-ionic conducting material (Yttria doped Ceria, simple called YDC) addition onγ-Al2O3 and various methanol/steam ratio for methanol steam reforming and decomposition reaction. The characteristics of catalyst were detected by TPR to observe the composition and the Cu surface area and dispersion; XRD to identify the crystal phase and crystalline size of catalyst; BET to detect the total surface area and pore size. The reaction was carried out in fixed-bed reactor, with the addition of proper glass beads at designed temperature and ambient pressure. And the products were sent by the way on-line method into GC for analysis. BET surface area analysis showed that the total surface area of γ-Al2O3 would be decreased by the addition of metals such as Cu, Y and Ce, and that was due to blockage of partial small pores resulting in larger pores occurred and smaller BET surface area than γ-Al2O3 support. For methanol steam reforming reaction, the oxygen-ionic conducting (YDC) support showed more apparent improvement on activities, but worse in decomposition reaction by decreasing of Cu+ amount. Methanol decomposition reaction produce lots of methyl formate in lower temperature, and reaction produce lots of dimethyl ether in higher temperature by acid property of carrier Al2O3.
(8774588), Spencer A. Fehlberg. "Decomposition of ammonium perchlorate encapsulated nanoscale and micron-scale catalyst particles." Thesis, 2020.
Знайти повний текст джерелаIron oxide is the most common catalyst in solid rocket propellant. We have previously demonstrated increased performance of propellant by encapsulating iron oxide particles within ammonium perchlorate (AP), but only nanoscale particles were used, and encapsulation was only accomplished in fine AP (~20 microns in diameter). In this study, we extended the size of particle inclusions to micron-scale within the AP particles as well the particle sizes of the AP-encapsulated catalyst particles (100s of microns) using fractional crystallization techniques with the AP-encapsulated particles as nucleation sites for precipitation. Here we report catalyst particle inclusions of micron-scale, as well as nanoscale, within AP and present characterization of this encapsulation. Encapsulating micron-sized particles and growing these composite particles could pave the way for numerous possible applications. A study of the thermal degradation of these AP-encapsulated particles compared against a standard mixture of iron oxide and AP showed that AP-encapsulated micron-scale catalyst particles exhibited similar behavior to AP-encapsulated nanoscale particles. Using computed tomography, we found that catalyst particles were dispersed throughout the interior of coarse AP-encapsulated micron-scale catalyst particles and decomposition was induced within these particles around catalyst-rich regions.
Yeh, Chun-hung, and 葉俊宏. "Cesium, Barium Promoted Ru/Carbon Catalyst for Hydrogenation from Ammonia Decomposition." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18558955079317210629.
Повний текст джерела國立聯合大學
化學工程學系碩士班
98
The purpose of this research was to observe Ruthenium /Carbon (Ru/C) promoted with Cesium (Cs), Barium (Ba) single ion promoter and Cs with Ba double ions promoter for hydrogenation from ammonia decomposition. This research added 1mol~8mol Cs, Ba single ion promoter to Ru/C catalyst and prepared three different molar ratios (Ba: Cs: Ru=0.5:4.5:1, 1:4:1, and 3:2:1) of Ba-Cs-Ru/C catalyst for the ammonia decomposition experiment at reaction temperature of 300℃~450℃ and ammonia input rate of 3.0 ml/min, 7.5 ml/min. The results of the experiment with ammonia decomposition indicated the higher reaction temperature could get better ammonia conversion and hydrogen formation. The hydrogen formation could be enhanced by a high ammonia input rate but the ammonia conversion would be lower than the low ammonia input rate. A Cs-Ru/C catalyst with higher Cs ion molar ratio had a better ammonia conversion and hydrogen formation, but Ba-Ru/C with a higher Ba ion molar ratio (Ba: Ru > 1mol) had an opposite result. Compare with Ru/C catalyst, the hydrogen formation of Cs-Ru/C (Cs: Ru=4:1 molar ratio) catalyst increased by 38.06% at the reaction temperature of 350℃ and the ammonia input rate of 3.0 ml/min. At 450℃ and 7.5 ml/min, the hydrogen formation of Ba-Cs-Ru/C (Ba: Cs: Ru=1:4:1 molar ratio) increased by 3.77% than Cs-Ru/C (Cs: Ru=4:1 molar ratio) catalyst. Additionally, the cannelure-plate structure of the Ru/C catalyst with particle size of 100μm was observed from FE-SEM. A crystal structure of Ba promoted Ru/C (Ba: Ru=1:1 molar ratio) catalyst was observed from XRD. The addition of Cs ion promoter to Ru/C decreased the specific surface area obviously based on BET analysis.
Hsieh, Cheng-Hsien, and 謝政憲. "Supported Pt catalyst for catalytic decomposition of formaldehyde at ambient temperature." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/11097122942773047787.
Повний текст джерела國立雲林科技大學
化學工程與材料工程系碩士班
100
Nowadays, people stay indoors longer and longer. Long-term exposure to indoor air containing volatile organic compounds may damage human health. An attempt was made to prepare platinum/titanium dioxide catalyst (Pt/TiO2) for the removal of formaldehyde at ambient temperature. This study was divided into two parts: The part one: we used the improved impregnation method and the chemical reduction method to prepare the catalysts with various Pt contents. Observing from XRD patterns and TEM images, Pt formed nanoparticles of ~1 nm in diameter and well dispersed deposited in the surface of the as-prepared catalysts. Because GC analysis was limited to low-concentration detection formaldehyde due to the sensitivity of a TCD detector, we changed to use the derivative method and HPLC analyses (measured at 360 nm) to quantify formaldehyde in this study. The experimental results showed that the conversion of formaldehyde could be near 100% for the 1.0-wt% Pt loading. The corresponding decomposition rate formaldehyde''s was 8.5784 mg/min.g cat. (GHSV = 49931.0 h-1). The part two: we used the functional silane to modify the 0.1wt% Pt/TiO2 and evaluated its activity. The experimental results showed that the conversion reached 25.6% while the ratio of catalyst and APTES was 1:1. The corresponding decomposition rate formaldehyde''s was 2.56 mg/min.g cat. (GHSV = 83000 h-1).
Chang, Hong Yih, and 張弘毅. "The promoter effect on the decomposition reaction of acetophenone over Pd catalyst." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/82393292163536695806.
Повний текст джерелаLiou, Jia-Yi, and 劉加毅. "Decomposition of sick house gas by catalyst embedded in cellulose nanofiber film." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/08986110647512382234.
Повний текст джерела國立臺灣科技大學
化學工程系
103
In this work, we have successfully prepared the TEMPO-oxidized cellulose nanofiber (TOCNF). Platinum nanoparticles stabilized by an NH2-terminated fourth generation poly(amido amine) dendrimer (DEN(PtNP)s) were covalently immobilized on 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-oxidized cellulose nanofiber (TOCNF) by using a condensing agent for amide bond formation between TOCNF and DEN(PtNP)s. Subsequently, the films with different concentrations of DEN(PtNP)s were prepared by filtrating TOCNF/DEN(PtNP)s suspensions on filter membranes, and the dried films were characterized. As-prepared TOCNF/DEN(PtNP)s film possessed the high catalytic efficiency to decomposition of formaldehyde (HCHO). The detection of formaldehyde is based on the Hantzsch reaction. This reaction involves the cyclization of 2,4-pentanedione and the formation of 3,5-diacetyl-1,4-dihydrolutidine (DDL), which can be detected by UV-vis absorption spectra. The relationship between absorbance of DDL at 413 nm and concentration of formaldehyde were determined on calibration curve, which was followed Beer–Lambert law. The results indicate that the DEN(PtNP)s prepared at the mixing ratio of [Pt-precursor] : [NH2 group in dendrimer] = 0.5 : 1 was adequate. Then the Pt nanoparticles could decompose successfully the HCHO molecules.
Yang, Chu-chun, and 楊筑鈞. "Optimize the non-precious metal catalyst for ammonia decomposition with Taguchi method." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/q7ugft.
Повний текст джерела國立臺北科技大學
資源工程研究所
107
The rare earth polishing powder usually contains 50% cerium oxide, 20% lanthanum oxide and other elements. A large amount of waste polishing powder was mostly treated by burial or incineration. If the lanthanum and cerium compounds in the wasted polishing powder could be recycled that will greatly reduce enterprise cost and implement waste circulation. Most of the catalysts for NH3 decomposition usually rely on copper-based catalysts. It has the advantages of low price, high catalytic ability, high stability and recyclability. Therefore, copper-based catalysts have become one of the materials intensively researched by industry and academia in recent years. In this study, we recycled the wasted glass polishing powder by acid-solution method, and mix different non-precious metal oxides to synthesize the catalysts with combustion synthesis method. Through Taguchi orthogonal array L18(21x37) planned the copper-based catalysis to add ten elements such as La, Sr, Co, Fe, Mg, Mn, Ni, Ce, Gd and Mo for NH3 decomposition. The catalysts effect of NH3 decomposition was detected by gas sensor. In result, the catalysts showed the average NH3 conversion and N2 selectivity. At 200℃, NH3 conversion and N2 selectivity was respectively at 73% and 97%. At 250℃, NH3 conversion and N2 selectivity was respectively at 77.8% and 67%. The NH3 conversion increased with the increase of reaction temperature. By the optimization analysis of Taguchi quality characteristics and change calcination time, it’s showed that the optimized catalyst of the NH3 conversion could rise to 84%, the N2 selectivity could rise to 99% at 200℃. At 250℃, the optimized catalyst of the NH3 conversion and N2 selectivity was respectively at 93% and 83%. Compared with the other sample in this study, the conversion and selectivity of optimized catalyst could be found the catalytic effect is more effective.
Yeh, Chi-Wei, and 葉智偉. "Evaluation of PCDD/F Decomposition over SCR Catalyst and Activated Carbon-Supported Catalysts." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/10511364482298981699.
Повний текст джерела國立中央大學
環境工程研究所
93
SCR was mainly applied to removal of NOx as initially developed and now it has been used to abate dioxin emissions as well. Presently, abatement of dioxin using catalysis has become the mainstream technology. This study can be divided into two parts including field tests and pilot-scale system tests. The former focuses on sampling and investigating the control of dioxin emissions for existing SCR devices. The latter utilized several kinds of activated carbon-supported catalysts (Cu/C, Fe/C and Cu-Fe/C) to evaluate the feasibility of removing dioxins. Regarding the tests conducted in field, the results showed that removal efficiency of gas-phase dioxin achieved with SCR at metal smelting factory was 66% while that of PCDD and PCDF were 67.6% and 65.4%, respectively. For the MSWI, the SCR could remove 95% of gas-phase dioxin, in which 96% of PCDD and 97% of PCDF were removed. The surface area of the honeycomb-type V2O5/WO3/TiO2 catalyst (870m2/m3) adopted by MSWI is much higher than that of plate-type V2O5/WO3/TiO2 catalyst (320 m2/m3) utilized by metal smelting factory, resulting in the higher removal efficiency obtained in MSWI. The source of pilot-scale system sampling in metal smelting factory conducted the removal efficiencies achieved by utilizing Cu/C, Fe/C and Cu-Fe/C catalysts were as high as 95%. As for source of pilot-scale system sampling in the MSWI, the removal efficiencies achieved with Cu/C and Fe/C catalysts were more than 90%. In the metal smelting factory, the destruction efficiencies of three catalysts at 150℃ were about 20-30%. However, the destruction efficiencies obtained with Fe/C and Cu-Fe/C catalysts increased with increasing temperature. At 250℃, the destruction efficiency achieved with Fe/C catalyst was 78%. In the MSWI, the destruction efficiencies obtained with activated carbon-supported catalysts (Cu/C and Fe/C) were 30-40% when the temperature was kept at 150℃. For the Fe/C catalyst, the obtained destruction efficiency at 200℃ was 66%; however, once the temperature is increased to 250℃, the destruction efficiency was reduced to 57%. For the results of metal smelting factory, dioxin were generated through catalysis when the temperature of the Cu/C catalyst was 200℃ or 250℃ and that of the Cu-Fe/C catalyst was 250℃. In the MSWI, dioxin were generated through catalysis while the temperature of the Cu/C catalyst was 250℃. Compared with the results obtained with Cu/C and Fe/C catalysts in the metal smelting factory, it can be concluded that dioxin would be more easily produced when Cu/C catalyst is applied. Although the Cu-Fe/C contained Cu as well, no dioxin was generated at 200℃, which might be relevant to the Cu content and operating temperature.
Li, Chia-Wen, and 李嘉文. "The effects of catalyst fillings on reactor performance for hydrogen production from ammonia decomposition." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/79631831706872076977.
Повний текст джерела國立聯合大學
機械工程學系碩士班
100
In this study, we investigate the effects of catalyst fillings on reactor performance for hydrogen production from ammonia decomposition. These different catalyst fillings ways are: (1) packed bed、(2) wall coated、(3) stainless steel mesh coated、(4)metal foam coated. The (1) and (2) are in common used. We propose (3) and (4) can easy to replace catalyst when it didn’t effect. We use the size is 10mm*6mm*2mm small flatbed reactor, 5wt%Ru/C is catalyst, CsNO3 is promoter, and sugar is adhesives. The ammonia decomposition temperature’s rage is 320~400oC. We also investigate the effects of carbonization temperature and Cs fillings for hydrogen production from ammonia decomposition. The results showed that the carbonization temperature for hydrogen production from ammonia decomposition is effect, and the best carbonization temperature is 800 oC. The results also showed that the decomposition efficiency of NH3 would increase with increasing the molar ratio of Cs/Ru when is 3.5 ratio, decreasing the flow rate of NH3 and increasing the temperature of reaction. If the Cs/Ru ratio is more than 3.5, the NH3 conversion would be low. It’s mean the Cs/Ru ratio have the best proportion. In addition, these four different ways on small flatbed reactor efficacy the best is packed bed, second is metal foam coated, next are wall coated and stainless steel mesh coated.
Van, der Merwe Abraham Frederik. "Reaction kinetics of the iron-catalysed decomposition of SO3 / Abraham Frederik van der Merwe." Thesis, 2014. http://hdl.handle.net/10394/13491.
Повний текст джерелаMIng (Chemical Engineering), North-West University, Potchefstroom Campus, 2014
You, Shih-Wei, and 游世暐. "Decomposition of Reactive Black 5 in Aqueous Solution by Ozone/H2O2 Process in the Presence of a Magnetic Catalyst." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/62970506797730188229.
Повний текст джерела國立宜蘭大學
環境工程學系碩士班
98
Particles are often too small to be separated from a reaction system and recycled, especially in wastewater treatment via a catalytic ozonation process. Thus, the objective of this study was to prepare a magnetic catalyst (SiO2/Fe3O4) that can be recycled by magnetic force. The effects of the characteristics of the magnetic catalyst, pH values, catalyst dosage, and initial concentration of Reactive Black 5 (RB5) on mineralization efficiency of the magnetic catalyst/H2O2/O3 process were also investigated. The mineralization efficiency of RB5 under various conditions followed the sequence: SiO2/Fe3O4/H2O2/O3 > SiO2/Fe3O4/O3 >Fe3O4/O3 ≈H2O2/O3 >O3 > SiO2/Fe3O4/H2O2. The recovery efficiency of the suspension SiO2/Fe3O4 by magnetic force was still > 90% for reuse. Given the results of our reuse and recovery experiments, the magnetic catalyst shows considerable promise for use in water treatment.
Brandt, Björn [Verfasser]. "Selectivity in hydrocarbon conversions and methanol decomposition on a Pd-Fe3O4 model catalyst : a molecular beam study / von Björn Brandt." 2008. http://d-nb.info/992390052/34.
Повний текст джерелаHuang, Yu-Wen, and 黃昱文. "Synthesis of Magnetic Binary Metal Oxide Catalyst and Its Application on Wet Air Oxidation Process for Decomposition of 2,4-Diaminotoluene." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80670677855610720893.
Повний текст джерела國立臺灣大學
環境工程學研究所
98
This study focuses on the synthesis of magnetic binary metal oxide catalyst (Pt/TiO2-ZrO2/SiO2/Fe3O4, Pt/T-ZSM) and the modified of magnetic catalyst (Pt/ZrO2/Fe3O4, Pt/ZM). These magnetic particles are used in the catalytic wet air oxidation process (CWAO) for the decomposition of 2,4-diaminotoluene (TDA). The performances for the treatment of TDA via WAO and CWAO systems are investigated. The characteristics of Pt/ZM and Pt/T-ZSM prepared in this work are with BET specific surface areas of 86.04 and 111.32 m2 g-1, saturation magnetizations of 13.14 and 6.08 emu g-1 respectively, contents of platinum on the catalyst surface of 2.59 and 1.75 wt.%, diameters of particles are smaller than 100 nm. Further, the superparamagnetic properties of these catalyst are still held after the use in CWAO process. In WAO system, the dominant operating parameter is temperature (T). The energy supply for the decomposition of contaminants increases with the increasing temperature. To ensure efficient oxidation, of course, the pressure of oxidant (PO2) should be sufficient for the reaction. After three hours reaction time (t) in WAO, as T = 523 K, PO2 = 1.38 MPa, stirring speed Nr = 500 rpm and initial concentration of TDA (CTDAo) = 500 mg L-1,the decomposition efficiency of TDA (ηTDA) and mineralization efficiency of TOC (ηTOC) are 99 and 75%, respectively. It shows that TDA is nearly decomposed at the condition of high temperature with enough oxidant. For the case with 0.5 g Pt/T-ZSM in CWAO, at the same conditions as above,ηTDA and ηTOC are 99 and 83%, respectively. In the same reaction conditions with 0.5 g Pt/ZM, ηTDA and ηTOC are 99 and 95%, respectively. Thus, as the magnetic catalysts are employed in the WAO system, the CWAO process can lower the activation energy of reaction, promoting the reaction rate and giving a higher ηTOC at the same reaction time. Comparing the performances per mass of Pt for the two catalysts, the ratio of values of ηTOC of Pt/T-ZSM to Pt/ZM is 1.29, indicating the oxidation ability of binary metal oxide catalysts Pt/T-ZSM is better than that of single metal oxide catalyst of Pt/ZM.
Stander, Barend Frederik. "Evaluation of a catalytic fixed bed reactor for sulphur trioxide decomposition / Barend Frederik Stander." Thesis, 2014. http://hdl.handle.net/10394/13946.
Повний текст джерелаPhD (Chemical Engineering), North-West University, Potchefstroom Campus, 2014
Saad, Sarra Ahmed Mohamed. "Processes and balance of organic matter turnover and transformation of mineral compounds during decomposition of biogenic material in the presence of soil material." Doctoral thesis, 2002. http://hdl.handle.net/11858/00-1735-0000-0006-AEC0-3.
Повний текст джерелаCiura, Klaudia. "Nośnikowe katalizatory rozkładu $N_{2}O$ : nanospinel kobaltowy rozproszony na podłożach tlenkowych." Praca doktorska, 2020. https://ruj.uj.edu.pl/xmlui/handle/item/269529.
Повний текст джерелаGudyka, Sylwia. "Opracowanie strukturalnego katalizatora do rozkładu $N_{2}O$ na podstawie funkcjonalnej korelacji : skład - morfologia - działanie." Praca doktorska, 2020. https://ruj.uj.edu.pl/xmlui/handle/item/276481.
Повний текст джерела(5929820), Shourya Jain. "Burning Behaviors of Solid Propellants using Graphene-based Micro-structures: Experiments and Simulations." Thesis, 2018.
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