Searched for: author%3A%22Urakawa%2C+A.%22
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van Beek, L.E. (author), Jain, D. (author), Gholkar, P.V. (author), Eldridge, T.J. (author), Nguyen, H.P. (author), Muramoto, Kei (author), Urakawa, A. (author)
Operando methodologies are widely used in heterogenous catalysis to understand unique state of catalyst materials emerging under specific reaction conditions and to establish catalyst structure-activity relationships. Recent studies highlight the importance of combining multiple operando techniques (multimodal approach) to gain complementary...
journal article 2024
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Bunea, S. (author), Li, M. (author), Demiröz, E. (author), Zeng, Peng (author), Willinger, Marc Georg (author), Urakawa, A. (author)
The influence of nanostructures and interaction of Sn and Ir in oxygen evolution catalysts in a polymer electrolyte membrane electrolyzer were investigated. For this aim, two synthesis methods, namely, the one-step solution combustion method and the precipitation-deposition method with sodium borohydride reduction, were evaluated to prepare...
journal article 2024
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Afreen, G. (author), Bansode, Atul (author), Wada, Kazuhito (author), Hirano, Makoto (author), Matsuda, Hirokazu (author), Urakawa, A. (author)
Multiphasic reaction of bicarbonate hydrogenation to form formate using homogeneous Ru PNP pincer catalyst in a continuous flow tubular reactor is reported. The reaction system consists of three phases. Catalyst is dissolved in toluene while potassium bicarbonate is dissolved in water. The significance of efficient mixing among the organic...
journal article 2024
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Homan, S.J.T. (author), Aylar, K. (author), Jurjevic, A. (author), Scolari, M. (author), Urakawa, A. (author), Taheri, P. (author)
When no hydrogen can reach the Pt catalyst in the anode for the hydrogen oxidation reaction (HOR) of an operating proton exchange membrane fuel cell (PEMFC), the anode potential increases and causes the cell potential to be reversed compared to normal operation conditions. During this reversal, the oxygen evolution reaction (OER) and carbon...
journal article 2024
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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 H<sub>2</sub>O effects for both CH<sub>4</sub> rate and C<sub>2</sub> selectivity, the OH radical formation, catalyzed through H<sub>2</sub>O activation with O<sub>2</sub> surface species, was critical for modeling selective Mn-K<sub>2</sub>WO<sub>4</sub>/SiO<sub>2</sub> catalysts. Based on our reported experimental...
journal article 2024
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Pinto, D. (author), Minorello, S. (author), Zhou, Zhouping (author), Urakawa, A. (author)
Carbon dioxide capture and reduction (CCR) process emerges as an efficient catalytic strategy for CO<sub>2</sub> capture and conversion to valuable chemicals. K-promoted Cu/Al<sub>2</sub>O<sub>3</sub> catalysts exhibited promising CO<sub>2</sub> capture efficiency and highly selective conversion to syngas (CO + H<sub>2</sub>). The dynamic...
journal article 2024
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Vico Van Berkel, D. (author), Urakawa, A. (author)
Insight into mechanisms of heterogeneously catalyzed reactions holds importance in the development and optimization of new catalytic materials. Yet, the approaches often used in such investigations heavily rely on assumptions concerning the reactor and kinetics. Herein we report a new kind of kinetic investigation taking CO<sub>2</sub>...
journal article 2024
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Stoian, Dragos (author), Sugiyama, Toshiyuki (author), Bansode, Atul (author), Medina, Francisco (author), van Beek, Wouter (author), Hasegawa, Jun-ya (author), Nakayama, Akira (author), Urakawa, A. (author)
Surface intermediate species and oxygen vacancy-assisted mechanism over CeO2 catalyst in the direct dimethyl carbonate (DMC) synthesis from carbon dioxide and methanol are suggested by means of transient spectroscopic methodologies in conjunction with multivariate spectral analysis. How the two reactants, i.e. CO2 and methanol, interact with the...
journal article 2023
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Abdinejad, M. (author), Subramanian, S.S. (author), Motlagh, Mozhgan Khorasani (author), Ripepi, D. (author), Pinto, D. (author), Li, Mengran (author), Middelkoop, J. (author), Urakawa, A. (author), Burdyny, T.E. (author)
The electrochemical CO<sub>2</sub> reduction reaction (CO<sub>2</sub>RR) is an attractive method to produce renewable fuel and chemical feedstock using clean energy sources. Formate production represents one of the most economical target products from CO<sub>2</sub>RR but is primarily produced using post-transition metal catalysts that...
journal article 2023
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Zhou, Hui (author), Docherty, Scott R. (author), Phongprueksathat, N. (author), Chen, Zixuan (author), Bukhtiyarov, Andrey V. (author), Prosvirin, Igor P. (author), Safonova, Olga V. (author), Urakawa, A. (author), Copéret, Christophe (author), Müller, Christoph R. (author), Fedorov, Alexey (author)
The direct synthesis of methanol via the hydrogenation of CO<sub>2</sub>, if performed efficiently and selectively, is potentially a powerful technology for CO<sub>2</sub> mitigation. Here, we develop an active and selective Cu-Zn/SiO<sub>2</sub> catalyst for the hydrogenation of CO<sub>2</sub> by introducing copper and zinc onto...
journal article 2023
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Rebber, Matthias (author), Sannemüller, Hendrik (author), Jaruszewski, Michael (author), Pfannkuche, Daniela (author), Urakawa, A. (author), Koziej, Dorota (author)
Efficient mass transfer and light utilization are essential for high photocatalytic production rates. Here, we present a hierarchical three-dimensional (3D)-printed aerogel photocatalyst that unites both aspects by taking inspiration from the light scattering in clouds during photochemical processes and from mass transfer in plants during...
journal article 2023
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Wirner, Luca C. (author), Kosaka, Fumihiko (author), Sasayama, T. (author), Liu, Yanyong (author), Urakawa, A. (author), Kuramoto, Koji (author)
Recently, carbon capture and reduction (CCR) technology has gained interest to directly convert CO<sub>2</sub> to value-added products without requiring purification of CO<sub>2</sub> and its subsequent transportation. CCR to methanol in one dual function material (DFM) poses mechanistic and kinetic challenges. To counteract this, a process...
journal article 2023
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Yamashita, Hiromi (author), Bian, Zhenfeng (author), Urakawa, A. (author), Stockenhuber, Michael (author)
contribution to periodical 2023
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Hu, L. (author), Pinto, D. (author), Urakawa, A. (author)
Direct valorization of methane via oxidative coupling of methane (OCM) is an encouraging alternative to conventional oil-based processes for the production of light hydrocarbons (ethane and ethylene). Abundant, inexpensive simple oxides such as MgO and La<sub>2</sub>O<sub>3</sub> possess the ability to selectively activate methane. However,...
journal article 2023
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Phongprueksathat, N. (author), Ting, Kah Wei (author), Mine, Shinya (author), Jing, Yuan (author), Toyoshima, Ryo (author), Kondoh, Hiroshi (author), Shimizu, Ken Ichi (author), Toyao, Takashi (author), Urakawa, A. (author)
Low temperature and high pressure are thermodynamically more favorable conditions to achieve high conversion and high methanol selectivity in CO<sub>2</sub> hydrogenation. However, low-temperature activity is generally very poor due to the sluggish kinetics, and thus, designing highly selective catalysts active below 200 °C is a great...
journal article 2023
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Bunea, S. (author), Coppens, Manoj (author), Urakawa, A. (author)
The continuous electrochemical NO reduction to ammonia in a PEM cell was investigated in this work. We used a ruthenium-based catalyst at the cathode and an iridium oxide catalyst at the anode. The highest ammonia faradaic efficiency was observed at 1.9 V cell voltage. Adjusting the NO flow allowed to achieve 97% NO conversion and 93% ammonia...
journal article 2023
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Pinto, D. (author), Hu, L. (author), Urakawa, A. (author)
Dynamic coke-mediated dry reforming of methane (DC-DRM) is an unsteady-state strategy to overcome the limitations of co-feed operation, including the fast deactivation of the catalysts and the loss of valuable H<sub>2</sub> in the reverse water gas-shift reaction. This paper proves the feasibility of DC-DRM on Ni-based catalytic systems,...
journal article 2023
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Li, M. (author), Verkuil, Jarco (author), Bunea, S. (author), Kortlever, R. (author), Urakawa, A. (author)
Direct electroreduction of nitric oxide offers a promising avenue to produce valuable chemicals, such as ammonia, which is an essential chemical to produce fertilizers. Direct ammonia synthesis from NO in a polymer electrolyte membrane (PEM) electrolyzer is advantageous for its continuous operation and excellent mass transport characteristics...
journal article 2023
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Kaneda, R. (author), Palomo Jiménez, J. (author), Hu, L. (author), Urakawa, A. (author)
The oxidative coupling of methane (OCM) was investigated using a catalyst with a core@shell structure or a physical mixture comprised of MgO and SiC or Fe<sub>3</sub>O<sub>4</sub>, which was thermally activated via two different heating methods, namely, conventional resistive heating and microwave heating. The use of microwave radiation...
journal article 2023
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Urakawa, A. (author), Ferri, Davide (author), Nuguid, Rob Jeremiah G. (author)
In spectroscopy and diffraction methods, the signatures of catalytically active sites are often submerged by the contribution of spectator species. In some cases, the signals may also superimpose with each other, hindering proper peak identification. Rationalizing a reaction pathway becomes very challenging, if not impossible, under these...
book chapter 2023
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