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High-Pressure oxidative coupling of methane on alkali metal catalyst – Microkinetic analysis and operando thermal visualization

Yu, Yuhang (author), Obata, Keisuke (author), Movick, William J. (author), Yoshida, Shintaro (author), Palomo Jiménez, J. (author), Lundin, Sean Thomas B. (author), Urakawa, A. (author), Sarathy, S. Mani (author), Takanabe, Kazuhiro (author)

To introduce promotional H₂O effects for both CH₄ rate and C₂ selectivity, the OH radical formation, catalyzed through H₂O activation with O₂ surface species, was critical for modeling selective Mn-K₂WO₄/SiO₂ catalysts. Based on our reported experimental...

journal article 2024

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Spatial Temperature and Water Molar Concentration Measurements Using Thermal and Electrostrictive Ligs During Operation of a Swirl Burner at Pressure

Weller, Lee (author), Shah, Priyav (author), Giles, Anthony (author), De Domenico, F. (author), Morris, Steve (author), Williams, Benjamin A.O. (author), Hochgreb, Simone (author)

Laser-Induced Grating Spectroscopy (LIGS) was applied in a high-pressure combustion facility. Instantaneous (sub-μs), spatially resolved (within 5 mm) measurements of temperature and molar fractions of water were obtained using thermal and electrostrictive LIGS signals. Temperatures up to 1800 K and water molar fractions between 0.01 and 0.12...

conference paper 2023

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Design of an elevated pressure electrochemical flow cell for CO₂ reduction

Morrison, A.R.T. (author), Girichandran, N. (author), Wols, Quincy (author), Kortlever, R. (author)

Abstract: The electrochemical CO₂ reduction reaction (CO₂RR) has been proposed as a sustainable way of closing the carbon cycle while synthesizing useful commodity chemicals. One of the possible routes to scale up the process is the elevated pressure CO₂RR, as this increases the concentration of the poorly...

journal article 2023

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Effects of a sidestream concentrated oxygen supply system on the membrane filtration performance of a high-loaded membrane bioreactor

Kim, S. (author), Curko, Josip (author), Matosic, Marin (author), Herrera, Aridai (author), Lopez-Vazquez, Carlos M. (author), Brdjanovic, Damir (author), Garcia, H. (author)

To investigate the influence of high-pressure and shear effects introduced by a concentrated oxygen supply system on the membrane filtration performance, a laboratory-scale membrane bioreactor (MBR) fed artificial municipal wastewater was operated continuously for 80 days in four phases equipped with different aerations systems: (P1) bubble...

journal article 2023

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Steering the product spectrum in high-pressure anaerobic processes: CO₂ partial pressure as a novel tool in biorefinery concepts

Ceron Chafla, P.S. (author), de Vrieze, Jo (author), Rabaey, Korneel (author), van Lier, J.B. (author), Lindeboom, R.E.F. (author)

Background: Elevated CO₂ partial pressure (pCO₂) has been proposed as a potential steering parameter for selective carboxylate production in mixed culture fermentation. It is anticipated that intermediate product spectrum and production rates, as well as changes in the microbial community, are (in)directly influenced by...

journal article 2023

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The key factor in High Pressure Hydrogenotrophic Denitrification: Hydrogen partial pressure

Zhou, Jianmin (author), Ding, Lei (author), Shi, Mu (author), Lindeboom, R.E.F. (author), Cui, Changzheng (author)

In the envisaged hydrogen economy, H₂ could be an interesting alternative electron donor for the denitrification of drinking water or wastewater. The main obstacle to engineering the hydrogenotrophic denitrification process is the low solubility of H₂ in water under atmospheric pressure, which limits denitrification rate...

journal article 2022

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Modelling of autogenerative high-pressure anaerobic digestion in a batch reactor for the production of pressurised biogas

De Crescenzo, Carmen (author), Marzocchella, Antonia (author), Karatza, Despina (author), Molino, Antonio (author), Ceron Chafla, P.S. (author), Lindeboom, R.E.F. (author), van Lier, J.B. (author), Chianese, Simeone (author), Musmarra, Dino (author)

Background: Pressurised anaerobic digestion allows the production of biogas with a high content of methane and, at the same time, avoid the energy costs for the biogas upgrading and injection into the distribution grid. The technology carries potential, but the research faces practical constraints by a.o. the capital investment needed in high...

journal article 2022

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Directional Selection of Microbial Community Reduces Propionate Accumulation in Glycerol and Glucose Anaerobic Bioconversion Under Elevated pCO₂

Ceron Chafla, P.S. (author), Chang, Yu Ting (author), Rabaey, Korneel (author), van Lier, J.B. (author), Lindeboom, R.E.F. (author)

Volatile fatty acid accumulation is a sign of digester perturbation. Previous work showed the thermodynamic limitations of hydrogen and CO₂ in syntrophic propionate oxidation under elevated partial pressure of CO₂ (pCO₂). Here we study the effect of directional selection under increasing substrate load as a...

journal article 2021

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High-pressure homogenized citrus fiber cellulose dispersions: Structural characterization and flow behavior

Serial, M. R. (author), Velichko, E. (author), Nikolaeva, T. (author), den Adel, R. (author), Terenzi, C. (author), Bouwman, W.G. (author), van Duynhoven, J. P.M. (author)

Functionalized biomass waste sources of cellulose have drawn attention due to their high availability and sustainability properties. In this work we characterize the structural and flow properties of high-pressure homogenized citrus fiber cellulose dispersions, employing SAXS, rheology and rheo-MRI techniques. The high-pressure treatment...

journal article 2021

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A high pressure die cast magnesium alloy with superior thermal conductivity and high strength

Rong, Jian (author), Zhu, Jia-Ning (author), Xiao, Wenlong (author), Zhao, Xinqing (author), Ma, Chaoli (author)

Thermal conductivity is a key parameter for high performance material needed for electronic devices. While most commercially used Mg foundry alloys exhibit low thermal conductivities. In this work, we developed an Mg–3RE–0.5Zn alloy that is suitable for high pressure die cast (HPDC) ultrathin wall cellphone components. The thermal...

journal article 2021

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Evolution of emission species in an aero-engine turbine stator

Augusto Viviani Perpignan, A.A.V. (author), Tomasello, S.G. (author), Gangoli Rao, A. (author)

Future energy and transport scenarios will still rely on gas turbines for energy conversion and propulsion. Gas turbines will play a major role in energy transition and therefore gas turbine performance should be improved, and their pollutant emissions decreased. Consequently, designers must have accurate performance and emission prediction...

journal article 2021

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Raman Fingerprint of Pressure-Induced Phase Transitions in TiS₃Nanoribbons: Implications for Thermal Measurements under Extreme Stress Conditions

Mishra, K. K. (author), Ravindran, T. R. (author), Island, J.O. (author), Flores, Eduardo (author), Ares, Jose Ramon (author), Sanchez, Carlos (author), Ferrer, Isabel J. (author), van der Zant, H.S.J. (author), Castellanos-Gomez, Andres (author)

Two-dimensional layered trichalcogenide materials have recently attracted the attention of the scientific community because of their robust mechanical and thermal properties and applications in opto- and nanoelectronics devices. We report the pressure dependence of out-of-plane Ag Raman modes in high quality few-layer titanium trisulfide ...

journal article 2020

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Modeling the electrochemical conversion of carbon dioxide to formic acid or formate at elevated pressures

Morrison, A.R.T. (author), van Beusekom, Vincent (author), Ramdin, M. (author), van den Broeke, L.J.P. (author), Vlugt, T.J.H. (author), de Jong, W. (author)

In this work a model of an elevated pressure CO₂ electrolyzer producing primarily formate or formic acid is presented. It consists of three parts: A model of the bulk electrolyte, the diffusion layer, and the electrode surface. Data from the literature was used to validate both the bulk portion of the model, as well as the overall...

journal article 2019

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1.5 GPa compact double-wall clamp cell for SANS and NSE studies at low temperatures and high magnetic fields

Sadykov, Ravil (author), Pappas, C. (author), Bannenberg, L.J. (author), Dalgliesh, Robert M. (author), Falus, Péter (author), Goodway, Christopher (author), Lelièvre-Berna, Eddy (author)

We have developed and realised a compact high-pressure clamp cell of the piston-cylinder type for Small Angle Neutron Scattering (SANS) and Neutron Spin Echo (NSE) spectroscopy measurements. The cell can pressurise φ5 mm samples up to 1.5 GPa. It is non-magnetic, produces a sufficiently low and flat SANS background with a relatively good...

journal article 2018

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Prospective techno-economic and environmental assessment of carbon capture at a refinery and CO₂ utilisation in polyol synthesis

Fernandez Dacosta, C. (author), Van Der Spek, Mijndert (author), Hung, Christine Roxanne (author), Oregionni, Gabriel David (author), Skagestad, Ragnhild (author), Parihar, Prashant (author), Gokak, D. T. (author), Strømman, Anders Hammer (author), Ramirez, Andrea (author)

CO₂ utilisation is gaining interest as a potential element towards a sustainable economy. CO₂ can be used as feedstock in the synthesis of fuels, chemicals and polymers. This study presents a prospective assessment of carbon capture from a hydrogen unit at a refinery, where the CO₂ is either stored, or partly...

journal article 2017

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Morphological and crystallographic anisotropy of severely deformed commercially pure aluminium by three-dimensional electron backscatter diffraction

Naghdy, Soroosh (author), Pirgazi, Hadi (author), Verleysen, Patricia (author), Petrov, R.H. (author), Kestens, L.A.I. (author)

International Union of Crystallography. The aim of this paper is to examine the morphological and crystallographic anisotropy that develops during high-pressure torsion (HPT) processing. Commercially pure aluminium was subjected to monotonic HPT deformation at room temperature. The microstructure and texture were studied by large-area electron...

journal article 2017

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Piezo-tolerant natural gas-producing microbes under accumulating pCO2

Lindeboom, R.E.F. (author), Shin, S.G. (author), Weijma, Jan (author), van Lier, J.B. (author), Plugge, Caroline M. (author)

Background: It is known that a part of natural gas is produced by biogenic degradation of organic matter, but the microbial pathways resulting in the formation of pressurized gas fields remain unknown. Autogeneration of biogas pressure of up to 20 bar has been shown to improve the quality of biogas to the level of biogenic natural gas as the...

journal article 2016

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Micro-fabricated channel with ultra-thin yet ultra-strong windows enables electron microscopy under 4-bar pressure

Alan, T. (author), Yokosawa, T. (author), Gaspar, J. (author), Pandraud, G. (author), Paul, O. (author), Creemer, F. (author), Sarro, P.M. (author), Zandbergen, H.W. (author)

Transmission electron microscopy (TEM) of (de-)hydrogenation reactions is crucial to characterize efficiency of hydrogen storage materials. The nanoreactor, a micromachined channel with 15-nm-thick windows, effectively confines the gas flow to an electron-transparent chamber during TEM of reactions. Realistic experiments require very high...

journal article 2012

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Development and evaluation of ultra high pressure waterjet cutting

Susuzlu, T. (author)

Abrasive waterjet (AWJ) cutting is a machining process to cut wide range of materials from soft materials such as rubber, leather to hard materials such as metals by means of a high-velocity slurry jet, formed as a result of injecting abrasive particles into a waterjet. The machining action is the result of these particles impacting against a...

doctoral thesis 2008

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High-pressure sulfidation of hydrotreating catalysts: Genesis and properties of the active phase

Dugulan, A.I. (author)

The global petroleum demand is projected to increase in the next decennia as oil is expected to remain the primary source of energy around the globe contributing to approximately 40% of the total consumption. The production of high-quality fuels from crude oil involves physical separation steps but also catalytic processes to remove contaminants...

doctoral thesis 2008