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“…With a maximum methane-reduction efficiency of 11%, such a process is attractive because the Cl atoms can be generated via the Fe 3+ /Fe 2+ sunlight photo-catalyzed reaction ( Figure 1 G). 1 …”
Section: Solutions Of Methane Emission Relief Derived From Oceanmentioning
confidence: 99%
“…Recently, a series of timely appeals, such as “The Global Methane Pledge” signed at the United Nations Climate Change Conference (COP26) and the “Global Methane Assessment” from the United Nations Environment Program, have called on global methane reduction and mitigation. 1 Figure 1 Records of methane emissions and mitigation solutions (A) Records of atmospheric methane concentration. The dashed line is the global emission trends.…”
mentioning
confidence: 99%
“…It has been revealed that anthropologic sources, such as the oil and gas industry, agriculture and livestock activity, landfills, and waste disposal, rather than natural sources, comprise the major driving forces of methane emissions ( Figure 1 A). 1 Currently, chemical loss, including atomic oxygen radicals and chlorine radicals, is regarded as the main sink that can remove almost more than 90% of methane. Various methods, devices, and policies, such as the direct-air-capture method, in which CO 2 is directly captured from the air and converted into chemical product through facilities containing selective chemicals, have been proposed to enhance the methane sink capacity 1 .…”
mentioning
confidence: 99%
“… 1 Currently, chemical loss, including atomic oxygen radicals and chlorine radicals, is regarded as the main sink that can remove almost more than 90% of methane. Various methods, devices, and policies, such as the direct-air-capture method, in which CO 2 is directly captured from the air and converted into chemical product through facilities containing selective chemicals, have been proposed to enhance the methane sink capacity 1 . Currently, about 18 direct-air-capture devices are in operation globally.…”
“…With a maximum methane-reduction efficiency of 11%, such a process is attractive because the Cl atoms can be generated via the Fe 3+ /Fe 2+ sunlight photo-catalyzed reaction ( Figure 1 G). 1 …”
Section: Solutions Of Methane Emission Relief Derived From Oceanmentioning
confidence: 99%
“…Recently, a series of timely appeals, such as “The Global Methane Pledge” signed at the United Nations Climate Change Conference (COP26) and the “Global Methane Assessment” from the United Nations Environment Program, have called on global methane reduction and mitigation. 1 Figure 1 Records of methane emissions and mitigation solutions (A) Records of atmospheric methane concentration. The dashed line is the global emission trends.…”
mentioning
confidence: 99%
“…It has been revealed that anthropologic sources, such as the oil and gas industry, agriculture and livestock activity, landfills, and waste disposal, rather than natural sources, comprise the major driving forces of methane emissions ( Figure 1 A). 1 Currently, chemical loss, including atomic oxygen radicals and chlorine radicals, is regarded as the main sink that can remove almost more than 90% of methane. Various methods, devices, and policies, such as the direct-air-capture method, in which CO 2 is directly captured from the air and converted into chemical product through facilities containing selective chemicals, have been proposed to enhance the methane sink capacity 1 .…”
mentioning
confidence: 99%
“… 1 Currently, chemical loss, including atomic oxygen radicals and chlorine radicals, is regarded as the main sink that can remove almost more than 90% of methane. Various methods, devices, and policies, such as the direct-air-capture method, in which CO 2 is directly captured from the air and converted into chemical product through facilities containing selective chemicals, have been proposed to enhance the methane sink capacity 1 . Currently, about 18 direct-air-capture devices are in operation globally.…”
“…Even quantification is, in principle, possible by modelling the direct problem that relates absorption to column density, and then solving the inverse problem. This possibility is particularly appealing since CH and CO are the two main greenhouse gases and there is a pressing need for cheap sensors for both of them [ 17 ].…”
Section: Summary Conclusion and Perspectivesmentioning
The need for affordable low-power devices has led MEMS-based thermal emitters to become an interesting option for optical gas sensors. Since these emitters have a low thermal mass, they can be easily modulated and combined with a lock-in amplifier for detection. In this paper, we show that the signal measured by a lock-in amplifier from a thermal emitter that varies its temperature periodically can have different spectral profiles, depending on the reference signal used. These virtual emitters appear because the Fourier series expansion of the emitted radiance, as a function of time, has different coefficients for each wavelength, and this spectral signature, which is different for each harmonic, can be retrieved using a reference signal that corresponds to its frequency. In this study, the effect is first proved theoretically and then is measured experimentally. For this purpose, we performed measurements with an IR camera provided with six different spectral filters of a modulated emitter, in combination with lock-in amplification via software. Finally, we show a potential application of this effect using multiple virtual emitters to gain spectral selectivity and distinguish between two gases, CO2 and CH4.
Methane (CH4) is a potent greenhouse gas and the second highest contributor to global warming. CH4 emissions are still growing at an alarmingly high pace. To limit global warming to 1.5 o C, one of the most effective strategies is to reduce rapidly the CH4 emissions by developing large-scale methane removal methods. The purpose of this perspective paper is threefold. (1) To highlight the technology gap dealing with low concentration CH4 (at many emission sources and in the atmosphere). ( 2) To analyze the challenges and prospects of solardriven gas phase advanced oxidation processes for CH4 removal. And (3) to propose some ideas, which may help to develop solar-driven gas phase advanced oxidation processes and make them deployable at a climate significant scale.
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