I criticised the chimney (which is inefficient) , not the photo catalyst approach (which I'm entirely unfamiliar with).
I have a number of questions * will necessary wavelengths get into the chimney? * how can the system work at night, when bulk air movement is provided by sunlight? * what are the catalysts that work at night, and what's the evidence for their performance? * why can't you just use TiO2 coating on roads and buildings, which have a larger area? On Sun, 31 Mar 2019, 14:22 Renaud de RICHTER, <[email protected]> wrote: > Yes, there is! > It consits in transforming N2O back into N2 and 1/2 O2 by photocatalysis > > Ming, Tingzhen, Renaud de_Richter, Sheng Shen, and Sylvain Caillol. "Fighting > global warming by greenhouse gas removal: destroying atmospheric nitrous > oxide thanks to synergies between two breakthrough technologies > <https://link.springer.com/article/10.1007/s11356-016-6103-9>." *Environmental > Science and Pollution Research* 23.7 (2016): 6119-6138. > https://link.springer.com/article/10.1007/s11356-016-6103-9 > > The article has been abridged by an independent service of the European > Union located in UK in > > http://ec.europa.eu > /environment/integration/research/newsalert/pdf/nitrous_oxide_removed_atmosphere_generation_renewable_energy_476na3_en.pdf > > > > Andrew you criticized it on > > https://groups.google.com/forum/#!searchin/geoengineering/nitrous > $20oxide%7Csort:relevance/geoengineering/wfc-qGC-Abs/iWtxCy0iEQAJ > > > _ . _ . _ . _ ._ . _ . > > Article abstract > > Even if humans stop discharging CO2 into the atmosphere, the average > global temperature will still increase during this century. A lot of > research has been devoted to prevent and reduce the amount of carbon > dioxide (CO2) emissions in the atmosphere, in order to mitigate the effects > of climate change. Carbon capture and sequestration (CCS) is one of the > technologies that might help to limit emissions. In complement, direct > CO2removal from the atmosphere has been proposed after the emissions have > occurred. But, the removal of all the excess anthropogenic atmospheric > CO2 will not be enough, due to the fact that CO2 outgases from the ocean as > its solubility is dependent of its atmospheric partial pressure. Bringing > back the Earth average surface temperature to pre-industrial levels would > require the removal of all previously emitted CO2. Thus, the atmospheric > removal of other greenhouse gases is necessary. This article proposes a > combination of disrupting techniques to transform nitrous oxide (N2O), the > third most important greenhouse gas (GHG) in terms of current radiative > forcing, which is harmful for the ozone layer and possesses quite high > global warming potential. *Although several scientific publications cite > “greenhouse gas removal,” to our knowledge, it is the first time innovative > solutions are proposed to effectively remove N2O or other GHGs from the > atmosphere other than CO2.* > > Keywords > Greenhouse gas removal Solar chimney power plant Photocatalytic > reduction Photocatalytic reactor Negative emission technology Cutting down > atmospheric N2O concentration to protect the ozone layer and lessen global > warming > > > > > Le dim. 31 mars 2019 à 14:52, Andrew Lockley <[email protected]> a > écrit : > >> Is there any literature on N2O geoengineering? I've not seen any, despite >> searching. >> >> It's highly persistent (~century) and has a high GWP (~300). It seems >> that the principal sink is soil bacteria, which relies on (very slow) gas >> exchange through the soil surface layer. >> >> AFAIK, total mitigation is very difficult (as 3/4 is from agriculture) - >> although partial mitigation can be achieved by better fertiliser practice, >> etc. >> >> (cross posting due to expertise in soil on the carbon list) >> >> Sources https://www.epa.gov/ghgemissions/overview-greenhouse-gases >> https://www.tandfonline.com/doi/abs/10.1080/00380768.2012.733869 >> >> Andrew >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Carbon Dioxide Removal" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to >> [email protected]. >> Visit this group at https://groups.google.com/group/CarbonDioxideRemoval. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/CarbonDioxideRemoval/CAJ3C-04ykwqcZ5nip%2Bi3XHeird9FSQeY86hWQcGwTSrFGKY%3DOg%40mail.gmail.com >> <https://groups.google.com/d/msgid/CarbonDioxideRemoval/CAJ3C-04ykwqcZ5nip%2Bi3XHeird9FSQeY86hWQcGwTSrFGKY%3DOg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. 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