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Tuning stability of titania-supported Fischer-Tropsch catalysts: Impact of surface area and noble metal promotion

van Koppen, L.M. (author), Dugulan, A.I. (author), Hensen, Emiel J.M. (author), Bezemer, G. Leendert (author)

Cobalt oxidation is a relevant deactivation pathway of titania-supported cobalt catalysts used in Fischer-Tropsch synthesis (FTS). To work towards more stable catalysts, we studied the effect of the surface area of the titania support and noble metal promotion on cobalt oxidation under simulated high conversion conditions. Mössbauer...

journal article 2024

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Effects of natural and thermal oxidation on electronic and optical properties of monolayer WS2: a theoretical study

Tang, Hongyu (author), Shi, Weiqi (author), Zhang, Rongjun (author), Fan, J. (author), Zhang, Kouchi (author)

Tungsten disulfide (WS2) has recently attracted considerable attention owing to its excellent physical, chemical, electronic, and optical properties, leading to increased research into its applications in electronic and optoelectronic devices. However, the oxidation of 2D material affects significantly its optical and electronic properties...

conference paper 2024

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Selective oxidation of aluminium in Mo(Al,Si)₂

Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Hermans, M.J.M. (author), Popovich, V. (author), Quadakkers, Willem J. (author), Sloof, W.G. (author)

Mo(Al_xSi_1-x)₂ alloy with x in the range of 0.35–0.65 were prepared by a one-step spark plasma sintering. To study the exclusive formation of an α-Al₂O₃ scale, oxidation experiments were conducted in low and high oxygen partial pressure ambient at 1373 K; viz.: 10⁻¹⁴ and 0.21...

journal article 2023

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Effects of boron addition on the high temperature oxidation of MoSi₂ alloys

Ding, Z. (author), Brouwer, J.C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author)

Boron containing MoSi₂ is a promising material for applications at high temperature, but the oxidation mechanism is still unclear. In this work, the high temperature (1100 °C) oxidation of B doped MoSi₂ in synthetic air has been investigated. A (boro)silicate layer is formed on the surface of the alloy, which features a...

journal article 2023

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Numerical Model For Short-Time High-Temperature Isothermal Oxidation of Fe–Mn Binaries at High Oxygen Partial Pressure

Aghaeian, S. (author), Brouwer, J.C. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)

Since the oxidation reactions in the process of steel production occur in harsh conditions (i.e., high temperatures and gas atmospheres), it is practically impossible to observe in situ the compositional changes in the steel and the formed oxide scale. Hence, a coupled thermodynamic-kinetic numerical model is developed that predicts the...

journal article 2023

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Mo(Al_xSi_1−x)₂ healing particles for high temperature ceramics and encapsulation by selective oxidation of aluminium

Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author)

To prevent premature triggering of the healing reaction in Mo-Si containing self-healing thermal barrier coating system, an oxygen impenetrable shell (α-Al₂O₃) around the sacrificial healing particles (MoSi₂) is desired. Here an encapsulation method is presented through selective oxidation of Al in Mo(Al<sub>x...

journal article 2023

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Interpreting the effectiveness of antioxidants to increase the resilience of asphalt binders: A global interlaboratory study

Adwani, Dheeraj (author), Sreeram, Anand (author), Pipintakos, Georgios (author), Mirwald, Johannes (author), Wang, Yudi (author), Hajj, Ramez (author), Jing, R. (author), Bhasin, Amit (author)

The design and use of antioxidant additives to reduce or slow down the aging of asphalt binders can bring about tremendous benefits to the asphalt industry. Despite many isolated and scattered research efforts showing mixed results, the application of this science to engineering-based solutions has been limited due to variability in results and...

journal article 2023

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Sequential Fe²⁺ oxidation to mitigate the inhibiting effect of phosphate and silicate on arsenic removal

Annaduzzaman, M. (author), Rietveld, L.C. (author), Hoque, Bilqis Amin (author), van Halem, D. (author)

Sequential iron (as Fe²⁺) oxidation has been found to yield improved arsenic (as As(III)) uptake than the single-step oxidation. The objective of this study was to gain a better understanding of interactions with phosphate (PO₄³⁻) and silicate (SiO₄²⁻) during sequential Fe²⁺...

journal article 2022

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Modelling of methane production and emissions

Sharma, Keshab (author), Gutierrez, Oriol (author), Yuan, Zhiguo (author), Daelman, Matthijs R.J. (author), van Loosdrecht, Mark C.M. (author), Volcke, Eveline I.P. (author)

This chapter provides a review of the models available for estimating the production and emission of methane from wastewater collection and treatment systems. The details of a number of mechanistic models as well as the simplified empirical models have been summarized. Their limitations have been identified and general methods for calibration...

book chapter 2022

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Initial High-Temperature Oxidation Behavior of Fe–Mn Binaries in Air: The Kinetics and Mechanism of Oxidation

Aghaeian, S. (author), Sloof, W.G. (author), Mol, J.M.C. (author), Bottger, A.J. (author)

High-temperature oxidation of steels can be relatively fast when exposed to air. Consequently, elucidating the effect of different parameters on the oxidation mechanism and kinetics is challenging. In this study, short-time oxidation was investigated to determine the oxidation mechanism, the affecting parameters, and the linear-to-parabolic...

journal article 2022

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Multifunctional ZrB₂-rich Zr_1-xCr_xB_y thin films with enhanced mechanical, oxidation, and corrosion properties

Bakhit, Babak (author), Dorri, Samira (author), Kooijman, A.M. (author), Wu, Zhengtao (author), Lu, Jun (author), Rosen, Johanna (author), Mol, J.M.C. (author), Hultman, Lars (author), Petrov, Ivan (author), Greene, J. E. (author), Greczynski, Grzegorz (author)

Refractory transition-metal (TM) diborides have high melting points, excellent hardness, and good chemical stability. However, these properties are not sufficient for applications involving extreme environments that require high mechanical strength as well as oxidation and corrosion resistance. Here, we study the effect of Cr addition on the...

journal article 2021

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Effect of laboratory aging on chemistry and rheology of crumb rubber modified bitumen

Wang, H. (author), Liu, X. (author), Apostolidis, P. (author), van de Ven, Martin (author), Erkens, S. (author), Scarpas, Athanasios (author)

Aging during construction and in-service substantially changes the chemical composition and physical properties of bitumen thereof influences the performance of asphalt pavements. The modification of bitumen by crumb rubber modifier (CRM) significantly increases the complexity of the aging mechanism and is expected to improve the aging...

journal article 2020

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Tunable Photodetectors via In Situ Thermal Conversion of TiS₃ to TiO₂

Ghasemi, Foad (author), Frisenda, Riccardo (author), Flores, Eduardo (author), Papadopoulos, N. (author), Biele, Robert (author), de Lara, David Perez (author), van der Zant, H.S.J. (author), Watanabe, Kenji (author), Castellanos-Gomez, Andres (author)

In two-dimensional materials research, oxidation is usually considered as a common source for the degradation of electronic and optoelectronic devices or even device failure. However, in some cases a controlled oxidation can open the possibility to widely tune the band structure of 2D materials. In particular, we demonstrate the controlled...

journal article 2020

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Solvent-free oxidation of 1-phenylethanol catalysed by gold nanoparticles supported on carbon powder materials

Carabineiro, Sónia A.C. (author), Ribeiro, Ana P.C. (author), Buijnsters, J.G. (author), Avalos-Borja, Miguel (author), Pombeiro, Armando J.L. (author), Figueiredo, José L. (author), Martins, Luísa M.D.R.S. (author)

Gold (1 wt.%) was loaded on several carbon materials, namely, polymer based carbon xerogel, activated carbon, microdiamonds, nanodiamonds, graphite and silicon carbide by double impregnation and sol immobilisation. The obtained catalysts were characterised by N₂ adsorption at -196 ºC, high-resolution transmission electron...

journal article 2019

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Heterogenized C-Scorpionate Iron(II) complex on nanostructured carbon materials as recyclable catalysts for microwave-assisted oxidation reactions

Ribeiro, Ana P.C. (author), Martins, Luísa M.D.R.S. (author), Carabineiro, Sónia A.C. (author), Buijnsters, J.G. (author), Figueiredo, José L. (author), Pombeiro, Armando J.L. (author)

The C-scorpionate iron(II) complex [FeCl₂(Tpm)] [Tpm=κ³-HC(C₃H₃N₂)₃] (1) was immobilized on five different nanostructured carbon materials (nanodiamonds, graphene nanoplatelets, graphene oxide, reduced graphene oxide, and nanohorns) to produce active, selective, and recyclable...

journal article 2018

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LED-Based Luminaire Color Shift Acceleration and Prediction

Lu, G. (author), Fan, Xuejun (author), Fan, Jiajie (author), Zhang, Kouchi (author)

Color stability is of major concern for LED-based products. Currently, much effort is done on lumen maintenance, and for color shift, no agreed method currently exists, be it from testing or from prediction side. To investigate the physics of color shift, we present experiments of each individual part failure of each individual part that are...

book chapter 2018

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Reliability and Lifetime Assessment of Optical Materials in LED-Based Products

Yazdan Mehr, M. (author), van Driel, W.D. (author), Zhang, Kouchi (author)

Lumen depreciation is one of the major failure modes in light-emitting diode (LED) systems. It originates from the degradation of the different components within the system, including the chip, the driver, and the optical materials (i.e., phosphorous layer). The kinetics of degradation in real-life applications is relatively slow, and in most...

book chapter 2018

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Self-healing M_n+1AX_n-phase ceramics

Farle, A.M. (author)

Damage management and the development of new materials come together in selfhealing Mn+1AXn phase ceramics. These ternary layered carbides and nitrides exhibit a multitude of properties, such as high temperature strength, fracture toughness, thermal and electrical conductivity and machinability, which have been discovered over the past 20 years....

doctoral thesis 2017

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Prediction of oxide phases formed upon internal oxidation of advanced high-strength steels

Mao, W. (author), Sloof, W.G. (author), Hendrikx, R.W.A. (author)

The effect of Cr on the oxidation of Fe–Mn-based steels during isothermal annealing at different dew points was investigated. The Fe–Mn–Cr–(Si) phase diagrams for oxidizing environments were computed to predict the oxide phases. Various Fe–Mn steels with different concentrations of Cr and Si were annealed at 950 °C in a gas mixture of Ar or N...

journal article 2017

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Thermo-Mechanical Fatigue of Compacted Graphite Iron in Diesel Engine Components

Ghodrat, S. (author)

Cast iron components in combustion engines, such as cylinder blocks and heads of trucks, are exposed for long periods of time to elevated temperatures. Moreover, the engines are started and stopped frequently during their operational life, constituting a large number of heating and cooling cycles. In geometrical complex components the sudden...

doctoral thesis 2013