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321 results on '"Balu, Alina M."'

1. Topological iron silicide with H* intermediate modulated surface for efficient electrocatalytic hydrogenation of nitrobenzene in neutral medium

Author

Wang, Yuchen, Liu, Yaoyu, Zhao, Zhiyue, Zheng, Zhikeng, Balu, Alina M., Luque, Rafael, and Yan, Kai

Subjects
Physics - Chemical Physics, Condensed Matter - Materials Science
Abstract

Electrocatalytic hydrogenation of nitrobenzene (Ph-NO2) reaction (EHNR) has been considered as a potential alternative to the traditional thermocatalytic process in the production of high-value aniline (Ph-NH2). However, due to the absence of robust catalyst and low surface H* coverage, the EHNR faces the challenges of undesired performance and indetermined mechanism. Herein, we construct a type of noble-metal free topological FeSi (M-FeSi) materials through a solvent-free microwave strategy for efficient EHNR in neutral medium. Impressively, benefiting from abundant active H* intermediates on the surface of M-FeSi catalyst, the topological M-FeSi catalyst exhibits 99.7% conversion of Ph-NO2 and 93.8% yield of Ph-NH2 after 200 C in neutral medium, which are superior to previous candidates and FeSi catalyst synthesized via the traditional arc-melting method under same conditions. Besides, theoretical calculations validate that high surface H* coverage over M-FeSi catalyst is conducive to switching the rate-determining step from Ph-NO2* Ph-NO* to Ph-NO* Ph-NHOH*, and thus decreasing the total energy barrier of electrocatalytic Ph-NH2 production.

Published
2024

2. Revisiting hydrotalcite synthesis: Efficient combined mechanochemical/coprecipitation synthesis to design advanced tunable basic catalysts

Author

Nope Eliana, Sathicq Ángel G., Martínez José J., ALOthman Zeid A., Romanelli Gustavo P., Nares Elena Montejano, Ivars-Barceló Francisco, Zuazo Juan Rubio, Luque Rafael, and Balu Alina M.

Subjects
Technology, Chemical technology, TP1-1185, Physical and theoretical chemistry, QD450-801
Abstract

Hydrotalcite materials (HTs) were synthesized by a facile and swift combined mechanochemistry/coprecipitation approach, and their catalytic activity was evaluated and compared with conventionally synthesized hydrotalcites (co-precipitation method) in the Knoevenagel condensation between furfural and ethyl cyanoacetate/malononitrile. Characterization and catalytic activity results clearly demonstrate that the proposed combined mechanochemical/coprecipitation approach provides an improvement in crystallinity, morphology, tunable basicity, and textural properties (higher surface area and enhanced surface properties) as compared to HTs obtained via conventional coprecipitation methods. In addition, mechanochemically synthesized HTs largely improve catalytic activities, including conversion and product selectivity to Knoevenagel condensation products under solventless conditions, short reaction times, or reaction at room temperature as compared to conventional counterparts (e.g., 30–40 vs > 99% product yields).

Published
2024
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11. International Perspectives on Green and Sustainable Chemistry Education via Systems Thinking

Author

Hurst, Glenn A., Slootweg, J. Chris, Balu, Alina M., Climent-Bellido, Maria S., Gomera, Antonio, Gomez, Paulette, Luque, Rafael, Mammino, Liliana, Spanevello, Rolando A., Saito, Kei, and Ibanez, Jorge G.

Abstract

Various international perspectives from selected regions where substantial work is being done on green and sustainable chemistry education emphasize a systems thinking framework. Common to most of the perspectives is the inclusion of more global paradigms involving economic, environmental, political, and social aspects as fundamental issues in the formerly merely technical and scientific discussions, as well as the development of laboratory experiences, training sessions, written materials, discussion meetings, and conferences. We include bird's eye views from Europe (the Green Chemistry Centre of Excellence at the University of York, United Kingdom; the University of Cordoba, Spain; and the University of Amsterdam, The Netherlands), Latin America (the Universidad Nacional de Rosario, Argentina, and the Universidad Iberoamericana, Mexico), Africa (the University of Venda, South Africa), and Australia (Monash University).

Published
2019
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26. Understanding Bridging Sites and Accelerating Quantum Efficiency for Photocatalytic CO2 Reduction.

Author

Wang, Kangwang, Hu, Zhuofeng, Yu, Peifeng, Balu, Alina M., Li, Kuan, Li, Longfu, Zeng, Lingyong, Zhang, Chao, Luque, Rafael, Yan, Kai, and Luo, Huixia

Subjects
QUANTUM efficiency, PHOTOREDUCTION, X-ray absorption near edge structure, CHARGE carriers, FOURIER transform spectroscopy, INTERFACE dynamics, CARRIER density
Abstract

Highlights: The S-vacancies result in the change of d-band electronic state of Mo. An internal quantum efficiency of 94.01% at 380 nm for photocatalytic CO2 reduction reaction (CO2RR). The Mo–S bridging bonds optimize adsorption energies and accelerate CO2RR kinetics. We report a novel double-shelled nanoboxes photocatalyst architecture with tailored interfaces that accelerate quantum efficiency for photocatalytic CO2 reduction reaction (CO2RR) via Mo–S bridging bonds sites in Sv–In2S3@2H–MoTe2. The X-ray absorption near-edge structure shows that the formation of Sv–In2S3@2H–MoTe2 adjusts the coordination environment via interface engineering and forms Mo–S polarized sites at the interface. The interfacial dynamics and catalytic behavior are clearly revealed by ultrafast femtosecond transient absorption, time-resolved, and in situ diffuse reflectance–Infrared Fourier transform spectroscopy. A tunable electronic structure through steric interaction of Mo–S bridging bonds induces a 1.7-fold enhancement in Sv–In2S3@2H–MoTe2(5) photogenerated carrier concentration relative to pristine Sv–In2S3. Benefiting from lower carrier transport activation energy, an internal quantum efficiency of 94.01% at 380 nm was used for photocatalytic CO2RR. This study proposes a new strategy to design photocatalyst through bridging sites to adjust the selectivity of photocatalytic CO2RR. [ABSTRACT FROM AUTHOR]

Published
2023
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