Searched for: subject%3A%22Hydrogen%255C+peroxide%22
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Staelens, Michael (author)
Cryogenic and semi-cryogenic propellants are the most commonly used liquid propellants for applications in medium-lift launch vehicles. Despite their high performance, the storage requirements for these propellants often lead to complex, heavy, and voluminous structures. The only storable propellant used in medium-lift launch vehicles, UDMH/NTO,...
master thesis 2024
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Vinskas, Žilvinas (author)
Highly concentrated hydrogen peroxide, known as high-test peroxide (HTP), is widely regarded as a greener and safer alternative to traditional hypergolic fuels. A recent development demonstrated the<br/>potential to manufacture HTP in-orbit, bypassing prolonged storage challenges associated with the substance. This sparked interest in...
master thesis 2023
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Piergentili, I. (author), Cai, Mao (author), Klemm, B. (author), Xu, B. (author), Luo, Sanzhong (author), Eelkema, R. (author)
The redox balance in tumor and diseased cells often leads to the production of reactive oxygen species (ROS). Many ROS-responsive materials based on sulfur oxidation have been reported with the goal of achieving controlled delivery at the tumor. However, these materials often lack responsiveness to low ROS concentrations present in the tumor...
journal article 2023
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Xu, X. (author)
H2O2 is a relatively 'green' oxidant because its by-products are only H2O. In recent years, an increasing number of enzymatic synthesis methods based on H2O2 have been estab-lished. H2O2-driven reactions are usually applied as an alternative to NAD(P)H-dependent reactions to avoid complicated cofactor regeneration systems.<br/><br/>The aim of...
doctoral thesis 2022
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Gilleran, Eoghan (author)
The current state of in-orbit refuelling involves launching propellant from the Earth’s surface in a single use refuelling craft, often to transfer hydrazine to the customer. This method is a logical first step however this architecture is not reusable, and it centres around a toxic and carcinogenic propellant. An architecture is proposed where...
master thesis 2022
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Tambağ, Emre (author)
With hydrazine on the list of "substances of very high concern" by the European Chemicals Agency; hence alternative (storable) liquid rocket propellants are being developed which are less hazardous. During this feasibility study, experiments have been performed with a thermal ignition system in combination with hydrogen peroxide and ethanol as...
master thesis 2022
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de Roos, Andreas (author)
High concentration hydrogen peroxide (HP) promises to be an economical and green alternative for hydrazine. However, it has only limited storage life, and addition of stabilizers must be avoided to preserve the high purity required for propellants. This work has investigated the mechanical fastening of normally dissolved stabilizers on the...
master thesis 2022
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Elferink, Pepijn (author)
This paper investigates the cost­-benefit, payload performance and technical feasibility of green storable upper stage design concepts on their potential implementation with existing launchers. Since the demand for reliable, safe, and cost­-effective transport to space is growing, it is necessary to find sustain­able rocket propellant solutions....
master thesis 2022
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Roy, M. (author), van Genuchten, Case M. (author), Rietveld, L.C. (author), van Halem, D. (author)
Groundwater contaminated with arsenic (As) must be treated prior to drinking, as human exposure to As at toxic levels can cause various diseases including cancer. Conventional aeration-filtration applied to anaerobic arsenite (As(III)) contaminated groundwater can remove As(III) by co-oxidizing native iron (Fe(II)) and As(III) with oxygen (O...
journal article 2022
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Samarawickrama, Kapeel (author)
Dawn Aerospace is start up company that is developing a reusable sub-orbital spaceplane. The MK-II rocket powered spaceplane uses High Test Peroxide for its main engine and reaction control system. Catalyst beds are required to decompose High Test Peroxide (HTP) to steam and Oxygen. To investigate the decomposition of HTP in a pellet catalyst...
master thesis 2021
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Molenberg, Ilse (author)
This thesis report is written as part of the Master Aerospace Engineering - Space Flight of the Delft University of Technology. The thesis was started in November 2020 and completed by June 30, 2021. The space industry is dominated by traditional highly toxic propellants, namely hydrazine. Due to its carcinogenic nature, REACH makes provisions...
master thesis 2021
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Kerstens, Fabio (author)
As a part of a <i>Future Launcher Preparatory Programme</i> contract issued by the European Space Agency, the aerospace startup company Dawn Aerospace is developing an integral, additive manufactured (AM), liquid rocket engine. This 2.5 kN class engine is propelled by the storable propellants 90% hydrogen peroxide and kerosene and used in the...
master thesis 2021
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Borsboom, Tommy (author)
An important topic in the field of rocket propulsion is the development of a new green advanced hypergolic rocket propulsion system. The current hypergolic propellants have one large drawback, namely the toxic properties. The injector has a crucial role in the performance of a liquid engine. Therefore, the next step in the development of this...
master thesis 2021
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Wang, F. (author), Zhang, Lu (author), Wei, L. (author), van der Hoek, J.P. (author)
During drinking water treatment, advanced oxidation process (AOP) with O3 and H2O2 may result in by-products, residual H2O2 and BrO3−. The water containing H2O2 and BrO3− often flows into subsequent granular activated carbon (GAC) filters. A concentrated H2O2 solution can be used as GAC modification reagent at 60 °C to improve its adsorption...
journal article 2021
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Franken, Thim (author), Valencia-Bel, Ferran (author), Jyoti, B.V.S. (author), Zandbergen, B.T.C. (author)
Since there is a high interest in the use of green propellants, hydrogen peroxide is coming back after once making place for the rise of Hydrazine in monopropellant propulsion systems. Typically, these thrusters are outfitted with catalyst beds. A fully modular 1N thruster is designed to provide the capability of testing and comparing the...
conference paper 2020
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van Schie, M.M.C.H. (author), Kaczmarek, Alexander T. (author), Tieves, F. (author), Gomez de Santos, Patricia (author), Paul, C.E. (author), Arends, I.W.C.E. (author), Alcalde, Miguel (author), Schwarz, Günter (author), Hollmann, F. (author)
H<sub>2</sub>O<sub>2</sub> can be accepted by several peroxygenases as a clean oxidant, able to supply both the necessary electrons and oxygen atom at the same time. The biocatalysts, in turn, are able to catalyse an array of interesting oxygen insertion reactions at enantio- and regio-selectivities hard to attain with classical chemical...
journal article 2020
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Yayci, Abdulkadir (author), Dirks, Tim (author), Kogelheide, Friederike (author), Alcalde, Miguel (author), Hollmann, F. (author), Awakowicz, Peter (author), Bandow, Julia E. (author)
The use of a microscale atmospheric pressure plasma jet (μAPPJ) was investigated for its potential to supply hydrogen peroxide in biocatalysis. Compared to a previously employed dielectric barrier discharge (DBD), the μAPPJ offered significantly higher H<sub>2</sub>O<sub>2</sub> production rates and better handling of larger reaction volumes....
journal article 2020
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Gonzales, A. (author), Guo, H. (author), Ortega-Ibáñez, Oscar (author), Petri, Coert (author), van Lier, J.B. (author), de Kreuk, M.K. (author), Hendriks, Alexander (author)
Sludge pre-treatments are emerging as part of the disposal process of solid by-products of wastewater purification. One of their benefits is the increase in methane production rate and/or yield, along with higher loading capacities of existing digesters. In this study, we report the performance of a pilot-scale compartmentalized digester (volume...
journal article 2020
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Willot, S.J. (author), Fernandez Fueyo, E. (author), Tieves, F. (author), Pesic, M. (author), Alcalde, Miguel (author), Arends, I.W.C.E. (author), Park, Chan Beum (author), Hollmann, F. (author)
Peroxygenases require a controlled supply of H<sub>2</sub>O<sub>2</sub> to operate efficiently. Here, we propose a photocatalytic system for the reductive activation of ambient O<sub>2</sub> to produce H<sub>2</sub>O<sub>2</sub> which uses the energy provided by visible light more efficiently based on the combination of wavelength...
journal article 2019
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Tieves, F. (author), Willot, S.J. (author), van Schie, M.M.C.H. (author), Rauch, M.C.R. (author), Younes, S.H.H. (author), Zhang, W. (author), Dong, J. (author), Gomez de Santos, P. (author), Hollmann, F. (author)
An increasing number of biocatalytic oxidation reactions rely on H <sub>2</sub> O <sub>2</sub> as a clean oxidant. The poor robustness of most enzymes towards H <sub>2</sub> O <sub>2</sub> , however, necessitates more efficient systems for in situ H <sub>2</sub> O <sub>2</sub> generation. In analogy to the well-known formate dehydrogenase to...
journal article 2019
Searched for: subject%3A%22Hydrogen%255C+peroxide%22
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