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Relevant bibliographies by topics / CH4 oxidation

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Journal articles

Academic literature on the topic 'CH4 oxidation'

Author: Grafiati

Published: 10 December 2022

Last updated: 29 January 2023

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Journal articles on the topic "CH4 oxidation"

1

Liu, Shanfu, Sagar Udyavara, Chi Zhang, et al. "“Soft” oxidative coupling of methane to ethylene: Mechanistic insights from combined experiment and theory." Proceedings of the National Academy of Sciences 118, no. 23 (2021): e2012666118. http://dx.doi.org/10.1073/pnas.2012666118.

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The oxidative coupling of methane to ethylene using gaseous disulfur (2CH4 + S2 → C2H4 + 2H2S) as an oxidant (SOCM) proceeds with promising selectivity. Here, we report detailed experimental and theoretical studies that examine the mechanism for the conversion of CH4 to C2H4 over an Fe3O4-derived FeS2 catalyst achieving a promising ethylene selectivity of 33%. We compare and contrast these results with those for the highly exothermic oxidative coupling of methane (OCM) using O2 (2CH4 + O2 → C2H4 + 2H2O). SOCM kinetic/mechanistic analysis, along with density functional theory results, indicate

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2

Preuss, I., C. Knoblauch, J. Gebert, and E. M. Pfeiffer. "Improved quantification of microbial CH<sub>4</sub> oxidation efficiency in arctic wetland soils using carbon isotope fractionation." Biogeosciences 10, no. 4 (2013): 2539–52. http://dx.doi.org/10.5194/bg-10-2539-2013.

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Abstract. Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH4). The observed accelerated warming of the arctic will cause deeper permafrost thawing, followed by increased carbon mineralization and CH4 formation in water-saturated tundra soils, thus creating a positive feedback to climate change. Aerobic CH4 oxidation is regarded as the key process reducing CH4 emissions from wetlands, but quantification of turnover rates has remained difficult so far. The application of carbon stable isotope fractionation enables the in situ quantification of

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3

van Grinsven, Sigrid, Kirsten Oswald, Bernhard Wehrli, et al. "Methane oxidation in the waters of a humic-rich boreal lake stimulated by photosynthesis, nitrite, Fe(III) and humics." Biogeosciences 18, no. 10 (2021): 3087–101. http://dx.doi.org/10.5194/bg-18-3087-2021.

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Abstract. Small boreal lakes are known to contribute significantly to global CH4 emissions. Lake Lovojärvi is a eutrophic lake in southern Finland with bottom water CH4 concentrations up to 2 mM. However, the surface water concentration, and thus the diffusive emission potential, was low (< 0.5 µM). We studied the biogeochemical processes involved in CH4 removal by chemical profiling and through incubation experiments. δ13C-CH4 profiling of the water column revealed a methane-oxidation hotspot just below the oxycline and zones of CH4 oxidation within the anoxic water column. In incubation e

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4

Nielsen, Cecilie Skov, Niles J. Hasselquist, Mats B. Nilsson, Mats Öquist, Järvi Järveoja, and Matthias Peichl. "A Novel Approach for High-Frequency in-situ Quantification of Methane Oxidation in Peatlands." Soil Systems 3, no. 1 (2018): 4. http://dx.doi.org/10.3390/soilsystems3010004.

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Methane (CH4) oxidation is an important process for regulating CH4 emissions from peatlands as it oxidizes CH4 to carbon dioxide (CO2). Our current knowledge about its temporal dynamics and contribution to ecosystem CO2 fluxes is, however, limited due to methodological constraints. Here, we present the first results from a novel method for quantifying in-situ CH4 oxidation at high temporal resolution. Using an automated chamber system, we measured the isotopic signature of heterotrophic respiration (CO2 emissions from vegetation-free plots) at a boreal mire in northern Sweden. Based on these d

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5

Yoshimura, Masahiro, Jun-ichiro Kase, and Shigeyuki Sōmiya. "Oxidation of SiC powder by high-temperature, high-pressure H2O." Journal of Materials Research 1, no. 1 (1986): 100–103. http://dx.doi.org/10.1557/jmr.1986.0100.

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The reaction between SiC powder and H2O has been studied at 400°–800 °C under 10 and 100 MPa. Silicon carbide reacted with H2O to yield amorphous SiO2 and CH4 by the reaction SiC + 2H2O→SiO2 + CH4 above 500 °C. Cristobalite and tridymite crystallized from amorphous silica after the almost complete oxidation of SiC above 700 °C. The oxidation rate, as calculated from the weight gain, increased with temperature and pressure. The Arrhenius plotting of the reaction rate based on a Jander-type model gave apparent activation energies of 167–194 kJ/mol. Contrasted with oxidation in oxidative atmosphe

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6

Nykänen, H., S. Peura, P. Kankaala, and R. I. Jones. "Recycling and fluxes of carbon gases in a stratified boreal lake following experimental carbon addition." Biogeosciences Discussions 11, no. 11 (2014): 16447–95. http://dx.doi.org/10.5194/bgd-11-16447-2014.

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Abstract. Partly anoxic stratified humic lakes are important sources of methane (CH4) and carbon dioxide (CO2) to the atmosphere. We followed the fate of CH4 and CO2 in a small boreal stratified lake, Alinen Mustajärvi, during 2007–2009. In 2008 and 2009 the lake received additions of dissolved organic carbon (DOC) with stable carbon isotope ratio (δ13C) around 16‰ higher than that of local allochthonous DOC. Carbon transformations in the water column were studied by measurements of δ13C of CH4 and of the dissolved inorganic carbon (DIC). Furthermore, CH4 and CO2 production, consumption and em

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7

Zheng, Jianqiu, Taniya RoyChowdhury, Ziming Yang, Baohua Gu, Stan D. Wullschleger, and David E. Graham. "Impacts of temperature and soil characteristics on methane production and oxidation in Arctic tundra." Biogeosciences 15, no. 21 (2018): 6621–35. http://dx.doi.org/10.5194/bg-15-6621-2018.

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Abstract. Rapid warming of Arctic ecosystems accelerates microbial decomposition of soil organic matter and leads to increased production of carbon dioxide (CO2) and methane (CH4). CH4 oxidation potentially mitigates CH4 emissions from permafrost regions, but it is still highly uncertain whether soils in high-latitude ecosystems will function as a net source or sink for CH4 in response to rising temperature and associated hydrological changes. We investigated CH4 production and oxidation potential in permafrost-affected soils from degraded ice-wedge polygons on the Barrow Environmental Observa

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8

Ren, Tie, John A. Amaral, and Roger Knowles. "The response of methane consumption by pure cultures of methanotrophic bacteria to oxygen." Canadian Journal of Microbiology 43, no. 10 (1997): 925–28. http://dx.doi.org/10.1139/m97-133.

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The rates of CH4 oxidation by strains of groups I and II methanotrophs in pure culture were studied at various O2 concentrations from 0 to 63 % v/v. In the presence of nonlimiting dissolved CH4 and inorganic nitrogen, O2 concentrations from 0.45 to 20% v/v supported maximum rates of CH4 oxidation. The critical dissolved O2 concentration under our conditions was about 5.7 μM, below which O2 was limiting for CH4 oxidation. Concentrations of O2 up to 63% v/v depressed the activity of CH4 oxidation by ≥ 23%. We conclude that methanotrophs are not microaerophilic under the conditions of our experim

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9

Preuss, I., C. Knoblauch, J. Gebert, and E. M. Pfeiffer. "Improved quantification of microbial CH<sub>4</sub> oxidation efficiency in Arctic wetland soils using carbon isotope fractionation." Biogeosciences Discussions 9, no. 12 (2012): 16999–7035. http://dx.doi.org/10.5194/bgd-9-16999-2012.

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Abstract. Permafrost-affected tundra soils are significant sources of the climate-relevant trace gas methane (CH4). The observed accelerated warming of the Arctic will cause a deeper permafrost thawing followed by increased carbon mineralization and CH4 formation in water saturated tundra soils which might cause a positive feedback to climate change. Aerobic CH4 oxidation is regarded as the key process reducing CH4 emissions from wetlands, but quantification of turnover rates has remained difficult so far. The application of carbon stable isotope fractionation enables the in situ quantificatio

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10

Martinez-Cruz, K., A. Sepulveda-Jauregui, K. Walter Anthony, and F. Thalasso. "Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes." Biogeosciences Discussions 12, no. 5 (2015): 4213–43. http://dx.doi.org/10.5194/bgd-12-4213-2015.

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Abstract. Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH4) produced in lakes. Aerobic CH4 oxidation depends on lake CH4 and oxygen (O2) concentrations, temperature, and organic carbon input to lakes, including from thawing permafrost in thermokarst (thaw)-affected lakes. Given the large variability in these environmental factors, CH4 oxidation is expected to be subject to large seasonal and geographic variations, which have been scarcely reported in the literature. In the present study, we measured CH4 oxidation rates in 30 Alaskan lakes along a

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