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Gas-phase reactions of [OsC] with methane at ambient temperature have been studied by using quadrupole-ion trap mass spectrometry combined with quantum chemical calculations. The comparison of [OsC] with the product clusters revealed significant changes in cluster reactivity. In particular, with different ligands, the cluster may produce multiple products or, alternatively, just a single product. Theoretical calculations reveal the influence of electronic features such as molecular polarity index, charge and spin distribution, and HOMO-LUMO gap on the reactivity of the Os complexes. Fundamentally, it is the polarity of the clusters that leads to the cluster reactivity in the methane activation. Furthermore, reducing the local polarity of the catalyst active site may be one means of reducing the number of byproducts in the reaction.
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http://dx.doi.org/10.1021/acs.jpclett.3c00982 | DOI Listing |
Waste Manag
September 2025
Department of Earth and Environment Sciences, St. Francis Xavier University, Antigonish, Canada.
We measured emissions from ten landfills using mobile surveys and Surface Emission Monitoring (SEM) to determine what fraction of emissions can be identified by SEM surveys. SEM is commonly used for regulatory compliance and leak detection at specific locations. However, evolving regulations emphasize the need to manage methane emissions from the entire landfill site, and the suitability of SEM for this objective remains unclear.
View Article and Find Full Text PDFSci Total Environ
September 2025
Department of Animal Sciences and Aquatic Ecology, Ghent University, Gent, Belgium.
Wetlands play a crucial role in global greenhouse gas (GHG) dynamics, yet their response to climate change is not yet fully understood. Here, we investigate how increasing temperature and oxygen availability interact to regulate wetland GHG emissions through combined analysis of biogeochemical and functional gene measurements. We found distinct temperature-dependent shifts in carbon emission pathways, with CO emissions unexpectedly declining as temperature rose from 15 to 25 °C, while increasing consistently at higher temperatures (25-35 °C), reflecting a transition to more thermally-driven processes.
View Article and Find Full Text PDFAnaerobic methanotrophic archaea (ANME) are crucial to planetary carbon cycling. They oxidise methane in anoxic niches by transferring electrons to nitrate, metal oxides, or sulfate-reducing bacteria. No ANMEs have been isolated, hampering the biochemical investigation of anaerobic methane oxidation.
View Article and Find Full Text PDFJ Am Chem Soc
September 2025
Institute of Integrated Research, Institute of Science Tokyo, 4259 Nagatsuta, Midori-ku, Yokohama 226-8501, Japan.
Upgrading methane to value-added chemicals is significant but still challenging. Well-designed catalysts are required to activate methane. Extensive efforts have been dedicated to the catalytic conversion of methane over transition-metal-containing catalysts.
View Article and Find Full Text PDFISME J
September 2025
Division of Biology and Biological Engineering, California Institute of Technology Pasadena, California, United States.
At methane seeps worldwide, syntrophic anaerobic methane-oxidizing archaea and sulfate-reducing bacteria promote carbonate precipitation and rock formation, acting as methane and carbon sinks. Although maintenance of anaerobic oxidation of methane (AOM) within seep carbonates has been documented, its reactivation upon methane exposure remains uncertain. Surface-associated microbes may metabolize sulfide from AOM, maintain carbonate anoxia, contribute to carbonate dissolution, and support higher trophic levels; however, these communities are poorly described.
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