Catalytic combustion of methane, the main component of natural gas, is a challenge under lean-burn conditions and at low temperatures owing to sulfur poisoning of the Pd-rich catalyst. This paper introduces a more sulfur-resistant catalyst system that can be regenerated during operation. The developed catalyst system lowers the barrier that has restrained the use of liquefied natural gas as a fuel in energy production.
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http://dx.doi.org/10.1002/cctc.201701884 | DOI Listing |
Chemistry
December 2024
Sapienza Università di Roma, Chemistry, Piazzale Aldo Moro 5, Dipartimento di Chimica, edificio CU 014, 00185, Rome, ITALY.
The outstanding efficiency and selectivity of enzymatic reactions, such as C-H oxidation by nonheme iron oxygenases, stems from a precise control of substrate positioning inside the active site. The resulting proximity between a specific moiety (a certain C-H bond) to the reactant (a FeIV(O) active species) translates into higher rates and selectivity, that can be in part replicated also with artificial supramolecular catalysts. However, structural modification of the position and orientation of the binding site both in enzymes and in artificial catalysts often leads to significant variations in reactivity that can be difficult to rationalize due to the system's complexity.
View Article and Find Full Text PDFCurr Opin Chem Biol
December 2024
Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA; Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA. Electronic address:
Enzymes catalyze molecular reactions with remarkable efficiency and selectivity under mild conditions. Photoactivated enzymes make use of a light-absorbing chromophore to drive chemical transformations, ideally using sunlight as an energy source. The direct attachment of a chromophore to native enzymes is advantageous, as information on the underlying catalytic mechanisms can be obtained.
View Article and Find Full Text PDFJ Environ Health Sci Eng
June 2025
Department of Chemistry and Biochemistry, North Carolina Central University, Durham, NC 27707 USA.
Unlabelled: Metformin, a widely used antidiabetic drug, has become a growing concern due to its persistence in the environment. It is one of the most frequently detected pharmaceuticals in wastewater and surface water because it is excreted largely unchanged by patients and is not fully removed in conventional wastewater treatment plants. The present study focuses on the synthesis and characterization of BaFeO/poly(1-naphthylamine) (PNA) nanohybrids and their application as microwave-active catalysts for the degradation of metformin.
View Article and Find Full Text PDFChem Catal
November 2024
Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, United States.
The use of visible light to drive chemical transformations has a history spanning over a century. However, the development of photo-redox catalysts to efficiently harness light energy is a more recent advancement, evolving over the past two decades. While ruthenium and iridium-based photocatalysts dominate due to their photostability, long excited-state lifetimes, and high redox potentials, concerns about sustainability and cost have shifted attention to first-row transition metals.
View Article and Find Full Text PDFEnviron Res
December 2024
Department of Global Smart City & School of Civil, Architectural Engineering, and Landscape Architecture, Sungkyunkwan University, 2066 Seobu-ro, Suwon 16419, Republic of Korea. Electronic address:
Titanium dioxide (TiO) is the most commonly used catalyst for fabricating commercial photocatalytic air purifier (AP) systems. The AP performance can be affected sensitively by the preparation conditions of filters and the physicochemical properties (e.g.
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