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Izelaar, B. (author), Ripepi, D. (author), Asperti, S. (author), Dugulan, A.I. (author), Hendrikx, R.W.A. (author), Bottger, A.J. (author), Mulder, F.M. (author), Kortlever, R. (author)The electrochemical dinitrogen reduction reaction (NRR) has recently gained much interest as it can potentially produce ammonia from renewable intermittent electricity and replace the Haber-Bosch process. Previous literature studies report Fe- and Mo-carbides as promising electrocatalysts for the NRR with activities higher than other metals....journal article 2023
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van Koppen, L.M. (author), Dugulan, A.I. (author), Leendert Bezemer, G. (author), Hensen, Emiel J.M. (author)The study of titania-supported cobalt nanoparticles is relevant for industrial Fischer-Tropsch synthesis (FTS). Herein, we report about various deactivation pathways of cobalt supported on P25 titania (cobalt loading 2–8 wt%) under simulated high conversion conditions using in situ Mössbauer spectroscopy. A fraction of metallic cobalt was...journal article 2023
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Ariëns, M.I. (author), van de Water, L. G.A. (author), Dugulan, A.I. (author), Brück, E.H. (author), Hensen, E. J.M. (author)Copper promotion of chromium-doped iron oxide prepared via co-precipitation for high-temperature water–gas shift (WGS) catalysis is investigated. Low-temperature Mössbauer spectra demonstrate that copper doping delays hematite (α-Fe<sub>2</sub>O<sub>3</sub>) formation in the fresh catalyst, favoring the formation of small crystallites of...journal article 2022
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Zhang, F. (author), Taake, Chris (author), Huang, B. (author), You, X. (author), Ojiyed, Hamutu (author), Shen, Q. (author), Dugulan, A.I. (author), Caron, Luana (author), van Dijk, N.H. (author), Brück, E.H. (author)In the field of nanoscale magnetocaloric materials, novel concepts like micro-refrigerators, thermal switches, microfluidic pumps, energy harvesting devices and biomedical applications have been proposed. However, reports on nanoscale (Mn,Fe)<sub>2</sub>(P,Si)-based materials, which are one of the most promising bulk materials for solid-state...journal article 2022
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Chai, Jiachun (author), Pestman, Robert (author), Chen, Wei (author), Donkervoet, Noortje (author), Dugulan, A.I. (author), Men, Zhuowu (author), Wang, Peng (author), Hensen, Emiel J.M. (author)The kinetics of the transformation of metallic Fe to the active Fe carbide phase at the start of the Fischer-Tropsch (FT) reaction were studied. The diffusion rates of C atoms going in or out of the lattice were determined using 13C-labeled synthesis gas in combination with measurements of the transient 12C and 13C contents in the carbide by...journal article 2022
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Kerry, T.J. (author), Peters, A.G.A. (author), Georgakopoulos, E. (author), Dugulan, A.I. (author), Meijer, Koen (author), Hage, Johannes (author), Offerman, S.E. (author), Yang, Y. (author)Within the steelmaking industry, a large amount of zinc-bearing waste is produced which cannot be effectively treated through integrated steel mills. Concurrently, zinc smelters generate waste residues containing significant amounts of iron and zinc which are stored or landfilled. The zinc concentration of iron and steelmaking residues...journal article 2022
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Maier, A. (author), van Oossanen, R. (author), van Rhoon, G.C. (author), Pignol, J.P.M. (author), Dugulan, A.I. (author), Denkova, A.G. (author), Djanashvili, K. (author)Heterostructured magnetic nanoparticles show great potential for numerous applications in biomedicine due to their ability to express multiple functionalities in a single structure. Magnetic properties are generally determined by the morphological characteristics of nanoparticles, such as the size/shape, and composition of the nanocrystals....journal article 2022
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Ariëns, M.I. (author), Van De Water, L. G.A. (author), Dugulan, A.I. (author), Brück, E.H. (author), Hensen, E. J.M. (author)A set of doped iron oxides (chromium, aluminum, gallium, indium, manganese, zinc, niobium) were prepared by a one-step coprecipitation/calcination approach evaluated for their WGS activity under industrially relevant conditions and characterized in detail. The WGS activity after ageing the doped catalyst for 4 days at 25 bar follows the order...journal article 2022
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Barrios, Alan J. (author), Peron, Deizi V. (author), Chakkingal, Anoop (author), Dugulan, A.I. (author), Moldovan, Simona (author), Nakouri, Kalthoum (author), Thuriot-Roukos, Joëlle (author), Wojcieszak, Robert (author), Thybaut, Joris W. (author)Hydrogenation into light olefins is an attractive strategy for CO<sub>2</sub>fixation into chemicals. In this article, high throughput experimentation and extended characterization were employed to identify the most efficient promoters and to elucidate structure-performance correlations and reaction paths in the CO<sub>2</sub>hydrogenation to...journal article 2022
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Prot, T.J.F. (author), Pannekoek, W. (author), Belloni, C. (author), Dugulan, A.I. (author), Hendrikx, R.W.A. (author), Korving, L. (author), van Loosdrecht, Mark C.M. (author)It was recently discovered that vivianite (Fe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>.8H<sub>2</sub>O) could be magnetically extracted from digested activated sludge which opened a new route for phosphorus recovery (Wijdeveld et al. 2022). While its formation in digested sludge is regularly reported, it is not yet studied for fresh,...journal article 2022
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van Koppen, L.M. (author), Dugulan, A.I. (author), Hensen, Emiel J.M. (author), Bezemer, G. Leendert (author)The commercial application of cobalt-based Fischer-Tropsch synthesis (FTS) suffers from catalyst deactivation. One of the main deactivation mechanisms under industrial conditions is sintering. In this work, we explored the role of manganese oxide as a structural promoter against sintering in a carbon nanofiber supported cobalt model catalyst....journal article 2022
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Kiecana, A. (author), Batashev, I. (author), Dugulan, A.I. (author), Kwakernaak, C. (author), Pieter, L. (author), Zhang, F. (author), van Dijk, N.H. (author), Brück, E.H. (author)The effect of Co and Ni doping on the structure, magnetic and magnetocaloric properties of Fe-rich (Mn,Fe)<sub>2</sub>(P,Si) compounds was studied. With increasing Co and Ni content, both the Curie temperature (T<sub>c</sub>) and the thermal hysteresis (ΔT<sub>hys</sub>) decreased, whereas the hexagonal P-62 m crystal structure was maintained...journal article 2022
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Tafjord, Joakim (author), Regli, Samuel K. (author), Dugulan, A.I. (author), Rønning, Magnus (author), Rytter, Erling (author), Holmen, Anders (author), Myrstad, Rune (author), Yang, J. (author)Transition metals supported on carbons play an important role in catalysis and energy storage. By pyrolysis of metal alginate, highly active catalysts for the Fischer-Tropsch synthesis (FTS) can be produced. However, the evolution of the carbon (alginate) and transition metal (Fe<sup>3+</sup>) during pyrolysis remains largely unknown and was...journal article 2022
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Prot, T.J.F. (author), Korving, L. (author), Dugulan, A.I. (author), Goubitz, K. (author), van Loosdrecht, Mark C.M. (author)The presence of soluble iron and phosphorus in wastewater sludge can lead to vivianite scaling. This problem is not often reported in literature, most likely due to the difficult identification and quantification of this mineral. It is usually present as a hard and blue deposit that can also be brown or black depending on its composition and...journal article 2021
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Gonugunta, P. (author), Dugulan, A.I. (author), Bezemer, G. Leendert (author), Brück, E.H. (author)Operando spectroscopic techniques (Diffusive Reflective Infrared Fourier-Transform and Mössbauer emission spectroscopy) were combined to investigate the role of oxygenates deposition on deactivation of cobalt on titania Fischer-Tropsch catalysts at high pressure. Clear formation of carboxylates was seen for catalysts prepared via both...journal article 2021
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Chai, Jiachun (author), Pestman, Robert (author), Chen, Wei (author), Dugulan, A.I. (author), Feng, Bo (author), Men, Zhuowu (author), Wang, Peng (author), Hensen, Emiel J.M. (author)The formation of Fe-carbide phases is relevant to the synthesis of Fischer-Tropsch synthesis catalysts. We investigated the carburization of Raney Fe as a model catalyst using spectroscopic and temperature-programmed techniques. IR spectroscopy shows that CO dissociation already occurs at −150 °C, while C diffusion into metallic Fe requires...journal article 2021
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Ariëns, M.I. (author), Chlan, V. (author), Novák, P. (author), van de Water, L. G.A. (author), Dugulan, A.I. (author), Brück, E.H. (author), Hensen, E. J.M. (author)Chromium promotion of iron oxide based water-gas shift (WGS) catalysts prepared via co-precipitation/calcination was investigated. Mössbauer spectroscopy and XRD evidence that chromium is incorporated in the calcined hematite (α-Fe<sub>2</sub>O<sub>3</sub>) precursor irrespective of the doping level (0−12 wt.%). CO-TPR shows chromium delays...journal article 2021
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Kjeldgaard, S. (author), Dugulan, A.I. (author), Mamakhel, Aref (author), Wagemaker, M. (author), Iversen, Bo Brummerstedt (author), Bentien, Anders (author)We report a comparison of different common synthetic strategies for preparation of Prussian blue analogues (PBA). PBA are promising as cathode material for a number of different battery types, including K-ion and Na-ion batteries with both aqueous and non-aqueous electrolytes. PBA exhibit a significant degree of structural variation. The...journal article 2021
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Lai, J. (author), You, X. (author), Dugulan, A.I. (author), Huang, B. (author), Liu, J. (author), Maschek, M. (author), van Eijck, L. (author), van Dijk, N.H. (author), Brück, E.H. (author)The first-order magneto-elastic transition in the Mn–Fe–P–Si alloys can be tailored by vanadium substitution. Alloys with a suitable V substitution provide an excellent magnetocaloric effect with minor hysteresis in low magnetic fields up to 1.2 T. Mössbauer measurements show that the hyperfine field is reduced by V substitution. Neutron...journal article 2020
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Prot, T.J.F. (author), Wijdeveld, W. (author), Eshun, L. Ekua (author), Dugulan, A.I. (author), Goubitz, K. (author), Korving, L. (author), van Loosdrecht, Mark C.M. (author)The recovery of phosphorus from secondary sources like sewage sludge is essential in a world suffering from resources depletion. Recent studies have demonstrated that phosphorus can be magnetically recovered as vivianite (Fe(II)<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>∗8H<sub>2</sub>O) from the digested sludge (DS) of Waste Water Treatment...journal article 2020
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