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Unveiling the Structure Sensitivity for Direct Conversion of Syngas to C2-Oxygenates with a Multicomponent-Promoted Rh Catalyst

Sun, X. (author), Jansma, H. (author), Miyama, Toshihito (author), Sanjeewa Aluthge, Rasika Dasanayake (author), Shinmei, Kenichi (author), Yagihashi, Noritoshi (author), Nishiyama, Haruka (author), Osadchii, D. (author), van der Linden, B. (author), Makkee, M. (author)

Abstract: Mn and Li promoted Rh catalysts supported on SiO₂ with a thin TiO₂ layer were synthesized by stepwise incipient wetness impregnation approach. The thin TiO₂ layer on the surface of SiO₂ was proved to stabilize those small Rh nanoparticles and hinder their agglomeration. The reducibility of...

journal article 2019

document

Qualification of an ultrasonic instrument for real-time monitoring of size and concentration of nanoparticles during liquid phase bottom-up synthesis

van Groenestijn, Gert Jan (author), Meulendijks, Nicole (author), van Ee, Renz (author), Volker, Arno (author), van Neer, P.L.M.J. (author), Buskens, Pascal (author), Julien, Cédric (author), Verheijen, Marcel (author)

Both in design and production of nanoparticles and nanocomposites it is of vital importance to have information about their size and concentration. During the formation of nanoparticles, real-time monitoring of particle size and concentration during bottom-up synthesis in liquids allows for a detailed study of nucleation and growth. This...

journal article 2018

document

Characterization of aerosols from RDD surrogate compounds produced by fast thermal transients

Di Lemma, F.G. (author), Colle, Jean Yves (author), Ernstberger, Markus (author), Konings, R. (author)

Experimental tests have been performed to characterize the aerosols representative of radiological dispersion devices (RDDs, a.k.a. "dirty bombs") by applying to chosen surrogate compound rapid high temperature transients, vaporizing the sample and forming aerosols mainly by rapid cooling of the vapour. The materials, which were tested in...

journal article 2016

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Are stirring and sonication pre-dispersion methods equivalent for in vitro toxicology evaluation of SiC and TiC?

Mejia, J. (author), Valembois, V. (author), Piret, J.P. (author), Tichelaar, F. (author), Van Huis, M. (author), Masereel, B. (author), Toussaint, O. (author), Delhalle, J. (author), Mekhalif, Z. (author), Lucas, S. (author)

The evolution of the particle size distribution and the surface composition of silicon carbide and titanium carbide nanoparticle (NP) dispersions were studied. The pre-dispersions were prepared using two commonly used protocols for dispersion: stirring and sonication. Two dispersants were investigated (water and Pluronic F108 1 %) at two stages:...

journal article 2012

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Fractal disperse hydrogen sorption kinetics in spark discharge generated Mg/NbOx and Mg/Pd nanocomposites

Anastasopol, A. (author), Pfeiffer, T.V. (author), Schmidt-Ott, A. (author), Mulder, F.M. (author), Eijt, S.W.H. (author)

Isothermal hydrogen desorption of spark discharge generated Mg/NbOx and Mg/Pd metal hydride nanocomposites is consistently described by a kinetic model based on multiple reaction rates, in contrast to the Johnson-Mehl-Avrami-Kolmogorov [M. Avrami, J. Phys. Chem. 9, 177 (1941); W. A. Johnson and R. F. Mehl, Trans. Am. Inst. Min., Metal. Eng. 135,...

journal article 2011

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Thermal stability of gas phase magnesium nanoparticles

Krishnan, G. (author), Kooi, B.J. (author), Palasantzas, G. (author), Pivak, Y. (author), Dam, B. (author)

In this work we present a unique transmission electron microscopy study of the thermal stability of gas phase synthesized Mg nanoparticles, which have attracted strong interest as high capacity hydrogen storage materials. Indeed, Mg nanoparticles with a MgO shell ( ? 3?nm thick) annealed at 300?°C show evaporation, void formation, and void...

journal article 2010

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On the influence of the sputtering in determining the resolution of a scanning ion microscope

Castaldo, V. (author), Hagen, C.W. (author), Kruit, P. (author), Van Veldhoven, E. (author), Maas, D. (author)

The determination of the quality of an imaging system is not an easy task for, in general, at least three parameters, strictly interdependent, concur in defining it: resolution, contrast, and signal-to-noise ratio. The definition of resolution itself in scanning microscopy is elusive and the case of scanning ion microscopy is complicated by the...

journal article 2009

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Impedance Simulation of a Li-Ion Battery with Porous Electrodes and Spherical Li+ Intercalation Particles

Huang, R.W.J.M. (author), Chung, F. (author), Kelder, E.M. (author)

We present a semimathematical model for the simulation of the impedance spectra of a rechargeable lithium batteries consisting of porous electrodes with spherical Li+ intercalation particles. The particles are considered to have two distinct homogeneous phases as a result of the intercalation and deintercalation of Li+ during charge and...

journal article 2006

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Analysis of LISST-data

Kessel, T. van (author)

report 2003

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Modelling and control of a jet mill plant

Gommeren, H.J.C. (author), Heitzmann, D.A. (author), Moolenaar, J.A.C. (author), Scarlett, B. (author)

journal article 2000

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Neutron depolarisation: A novel technique for studying phase transformation kinetics in steels

Te Velthuis, S.G.E. (author), Rekveldt, M.T. (author), Van der Zwaag, S. (author)

journal article 1995

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Bepaling statische momenten van de optische extinctie door deeltjes in suspensie

Lafort, A.M. (author), Godefroy, H.W.H.E. (author)

report 1994

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Gemiddelde en standaard deviatie van de optische extinctie door deeltjes in suspensie

Godefroy, H.W.H.E. (author), Fang Yanjun, - (author)

report 1994

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Vapour-phase synthesis of titanium nitride powder

Dekker, J.P. (author), Van der Put, P.J. (author), Veringa, H.J. (author), Schoonman, J. (author)

journal article 1994

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Development of silt measuring methods: Characterization of suspension samples Poortershaven

Schaafsma, A.S. (author)

report 1993

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Acoustic detection of phytoplankton: A pre-feasibility study

Schaafsma, A.S. (author)

report 1991

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Development of silt measuring methods: Particles of irregular shape, scattering and multicomponent mixtures

Schaafsma, A.S. (author)

report 1991

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Terminal velocity formula for spheres in a viscous fluid

Slot, R.E. (author)

Various attempts have been made to develop a general expression for the terminal velocity of spheres in a viscous fluid (Stokes, Prandtl, Oseen, Rubey, etc.: see Bogardi, 1974 and Vanoni, 1975). All of these formulae show a lack of accuracy and/or are restrict ed to a relatively small range of Reynolds numbers. Since sieving is a time consuming...

report 1983

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An improved settling tube system

Slot, R.E. (author)

In this report a settling tube system is described for the measurement of the settling velocity distribution of sand samples with particle diameters ranging from 0.1 to 2 mm and sample weights ranging from 0.1 to 20 gf(10^-3 to 0.2 N). The time of arrival of the particles is detected by means of an underwater balance. The response, stability and...

report 1983

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Settling Tube Analysis of Sand

Geldof, H.J. (author), Slot, R.E. (author)

For various reasons particle-size analysis of sediment is used in many fields of science and technology, a.o. earth sciences, agricultural and civil engineering. Relatively coarse-grained sediment like sand, with dimensions ranging from 0.06 till 2 mm, is analyzed almost exclusively by sieving. The size of particles in the silt and clay range (0...

report 1979