Thanks, Andrew, for the recent updates on DAC. I remain puzzled, however, by the continuing interest in artificial air CO2 capture when we've got in gross some 700+ GT of air CO2 capture/yr naturally going on, in net consuming 55-60% of our CO2 emissions. Contrary to one of the articles*, air capture is not a "concept", it's what is currently saving our bacon right now. Wouldn't it make a lot more sense (and save a lot of cents) figuring out how to enhance/exploit these natural CO2 absorption and conversion processes (e.g, BECCS, CROPS, ocean alkalization, enhance mineral weathering, etc.) rather than trying to reinvent the wheel from the ground up, competing on a cost basis with what nature already does for free? How about investing in improving on the global scale "engineering" that's already in place? Regards, Greg
*http://pubs.acs.org/doi/abs/10.1021/ie300691c?prevSearch=air%2Bcapture&searchHistoryKey= ________________________________________ From: [email protected] [[email protected]] On Behalf Of Andrew Lockley [[email protected]] Sent: Wednesday, July 25, 2012 11:59 AM To: geoengineering Subject: [geo] Air capture: Modification of the Mg/DOBDC MOF with Amines to Enhance CO2 Adsorption from Ultradilute Gases http://pubs.acs.org/doi/abs/10.1021/jz300328j Modification of the Mg/DOBDC MOF with Amines to Enhance CO 2 Adsorption from Ultradilute Gases Sunho Choi, Taku Watanabe, Tae-Hyun Bae, David S. Sholl, Christopher W. Jones J. Phys. Chem. Lett., 2012, 3 (9), pp 1136–1141 DOI: 10.1021/jz300328j The MOF Mg/DOBDC has one of the highest known CO 2 adsorption capacities at the low to moderate CO 2 partial pressures relevant for CO 2 capture from flue gas but is difficult to regenerate for use in cyclic operation. In this work, Mg/DOBDC is modified by functionalization of its open metal coordination sites with ethylene diamine (ED) to introduce pendent amines into the MOF micropores. DFT calculations and experimental nitrogen physisorption and thermogravimetric analysis suggest that 1 ED molecule is added to each unit cell, on average. This modification both increases the material’s CO 2 adsorption capacity at ultradilute CO 2 partial pressures and increases the regenerability of the material, allowing for cyclic adsorption–desorption cycles with identical adsorption capacities. This is one of the first MOF materials demonstrated to yield significant adsorption capacities from simulated ambient air (400 ppm CO 2 ), and its capacity is competitive with the best-known adsorbents based on amine–oxide composites. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en. -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
