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The isothermal, low-temperature stepwise conversion of methane to methanol over copper-exchanged zeolites eliminates the time-consuming heating and cooling steps of the conventional high temperature activation approach. To better understand differences between the two approaches, a series of zeolites were screened, of which omega zeolite (MAZ) showed superior performance in both the isothermal and conventional approaches.
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http://dx.doi.org/10.1039/c9cc05659a | DOI Listing |
Bioresour Technol
September 2025
State Key Laboratory of Bioreactor Engineering and School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, PR China; Engineering Research Center of Microbial Enhanced Oil Recovery, East China University of Science and Technol
Carbon dioxide enhanced oil recovery (CO-EOR) is widely used for carbon capture, utilization, and storage in Chinese oilfields, but part of injected CO returns with produced oil, reducing carbon-reduction efficiency. Bioconverting this CO to methane energy by methanogens benefits the technology, yet on-site high-efficiency conversion meeting natural-gas grid standards remains challenging. This study used a newly-designed triple-tank bioreactor to investigate CO-to-methane conversion and methanogenic kinetics of Methanococcus maripaludis.
View Article and Find Full Text PDFJ Air Waste Manag Assoc
September 2025
Interdisciplinary Science Department, Brookhaven National Laboratory, Upton, NY, USA.
Emission factor data for existing heating appliances are being used to estimate achievable emission reductions with emerging heating technologies. However, the emission factors currently being used for modeling were developed prior to low-sulfur fuel standards and rely on a small number of studies, mostly focusing on steady-state operation. In this work, detailed emission measurements of typical heating equipment fired with natural gas and No.
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 PDFEnviron Sci Technol
September 2025
State Key Joint Laboratory of Environment Simulation and Pollution Control, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
The rapid growth of natural-gas vehicles (NGVs) necessitates robust catalysts for the simultaneous abatement of methane (CH), nitrogen oxides (NO), and carbon monoxide (CO) under fluctuating exhaust compositions. We reported a site-engineered MnGa@In-CHA OXZEO catalyst in which indium was confined within an SSZ-13 framework, and GaO and MnO phases were uniformly dispersed on its exterior. MnO markedly enhanced redox capacity, driving NO → NO oxidation and lowering the activation energy for C-H bond cleavage in CH, while GaO tuned the Brønsted acidity and mediated electron transfer among In, Mn, and Ga centers.
View Article and Find Full Text PDFChemSusChem
September 2025
Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, College of Energy, Soochow University, Suzhou, 215006, P. R. China.
The electrochemical reduction of CO to CH offers a promising pathway for renewable energy storage, yet remains limited by sluggish kinetics, poor catalyst stability, and competing hydrogen evolution reactions (HER). Herein, a host-guest strategy is reported for engineering metal-organic frameworks (MOFs) through the encapsulation of conductive polymers to stabilize reticular skeletons and regulate interfacial water for efficient CO-to-CH conversion. Specifically, polypyrrole (PPy) and polyaniline (PANI) are confined within Cu-anchored UiO-67 frameworks, resulting in hybrid catalysts-PPy@Cu-UiO-67 and PANI@Cu-UiO-67-with preserved crystallinity and enhanced electronic conductivity.
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