asteroza + co2   226

Concentrated Solar Photovoltaics provide both electricity and heat.
Last pic has a split hybrid CSP system, with visible spectrum PV with an IR reflector, feeding IR to a fiber line for use elsewhere in a high temp electrolysis cell.
hybrid  CSP  PV  thermal  IR  fiber  optic  transfer  power  generator  solar  high  temperature  electrolysis  hydrogen  gas  production  syngas  CO2  cracking 
28 days ago by asteroza
3 Carbon Dioxide | Emergency and Continuous Exposure Guidance Levels for Selected Submarine Contaminants: Volume 1 | The National Academies Press
Hrm, pages 53-55 suggest actual issues only in the 25000 ppm range, not the 1400ppm suggested by the harvard study, derived from submarine crew studies, but some of the studies had not a lot of study participants, and US Navy standards and expectations for crew may be somewhat different (currently they try to keep average 3500ppm and try to keep below 8000ppm, but they are also in a long term exposure environment where the body may adapt)(previously 4,100 ppm average with a range of 300-11,300 ppm)...
CO2  air  quality  health  medicine  safety  decision  navy  submarine  crew 
4 weeks ago by asteroza
Impaired Decision Making in Conference Rooms - GIGA循绿
Wait this says 3 people just sitting quietly in a room for 1 hour have impaired cognitive function due to CO2! ASHRAE limit is 1000ppm, these guys suggest 1400ppm is the line for cognitive impairment.
meeting  CO2  air  quality  health  medicine  business  productivity  safety  decision 
4 weeks ago by asteroza
Associations of Cognitive Function Scores with Carbon Dioxide, Ventilation, and Volatile Organic Compound Exposures in Office Workers: A Controlled Exposure Study of Green and Conventional Office Environments
Study shows 3 people in a 2 hour meeting in a conference room have impaired cognitive functions due to high CO2, such that decisions at the end of the meeting suffer.This naturally gets worse with more people.
meeting  CO2  air  quality  health  medicine  business  productivity  safety  decision 
4 weeks ago by asteroza
Efficient CO2 Utilization via a Hybrid Na-CO2 System Based on CO2 Dissolution - ScienceDirect
Converts CO2 to hydrogen and baking soda via electrolytic cell and aqueous solution. Dependent on the aqueous solution though, where does that come from, how hard is it to regenerate, etc. Makes power too
CCS  CO2  carbon  capture  baking  soda  hydrogen  gas  production  power  generator  electrolytic  cell  sodium  ionic  conductor  NASICON  separator  membrane  chemistry 
10 weeks ago by asteroza
Modeling and Experimental Results for Condensing Supercritical CO2 Power Cycles
Interesting work on condensing backend supercritical CO2 power cycles. Notably, need a coldsink less than 31C for liquid recompression to work
condensing  supercritical  CO2  power  cycle  generator  research  technology  liquid  phase 
january 2019 by asteroza
Zero emission synfuel from seawater | Brave New Climate
More like ocean CO2 capture, which considering ocean acidification, is probably a not bad idea to pursue...
ocean  seawater  CO2  carbon  capture  CCS  synfuel  production 
december 2018 by asteroza
CarbonCure
Some sort of CCS in the form of direct injection of CO2 into wet concrete?
CCS  CO2  injection  concrete  materials  science  research  technology  construction 
october 2018 by asteroza
Ceramic–metal composites for heat exchangers in concentrated solar power plants | Nature
New hybrid ceramic for use in heat exchangers. Start with a titanium carbide porous block, immerse in a copper and zirconium bath. The zirconium infiltrates the ceramic and displaces titanium in the carbide, while the titanium migrates into the open pores. Copper ends up being a thin film sealant.
supercritical  CO2  heat  exchanger  PCHE  materials  science  research  technology  titanium  carbide  zirconium  copper 
october 2018 by asteroza
A Process for Capturing CO2 from the Atmosphere: Joule
Air carbon capture appears to now be below $1000/ton
air  carbon  capture  CO2  direct  CCS  sorbent 
june 2018 by asteroza
REACTIVE INNOVATIONS, LLC - Reactive Innovations
Some sort of electrochemical CO2 separator that can operate at high pressure. NASA is looking into using it for mars ISRU for CO2 feedstock
electrochemical  CO2  separator  separation  NASA  space  mars  ISRU  research  technology 
june 2018 by asteroza
NEDO to Evaluate Technologies to Produce Methane Using CO2 From Coal, Green Hydrogen - News - Solar Power Plant Business
Uh, making synthetic methane from coal plant CO2 exhaust and solar PV electric cracked hydrogen seems kinda roundabout, but I guess if you don't have a syngas consumer nearby...
synthetic  methane  production  carbon  capture  CCS  CO2  reuse  japan  coal 
december 2017 by asteroza
Innovator Energy
Interesting CCS system, but I wonder how flue gas contaminants screw up the bubbler solvent chemistry
CCS  CO2  carbon  capture  ethanol  ammonium  bicarbonate  liquid  solvent  bubbler  flue  gas 
december 2017 by asteroza
Cyborg Bacteria Change the Game in Carbon Dioxide Reduction - IEEE Spectrum
tweaked bacteria equipped with cadmium sulfide nanocrystals have superior photosynthesis efficiency, converting sunlight and CO2 into acetic acid, which can be fed to other tweaked E. Coli who can convert acetic acid to butanol.
artificial  photosynthesis  cadmium  sulfide  nanocrystal  bacteria  CO2  fixation  biology  materials  science  research  technology  synthetic  synfuel  biofuel 
august 2017 by asteroza
Systematic Variation of the Optical Bandgap in Titanium Based Isoreticular Metal...
They found MOF's that can operate as photocatalysts to breakdown CO2, so potentially workable as an artificial photosynthesis path
MOF  artificial  photosythesis  CO2  breakdown  photocatalyst  blue  light  solar  fuel  synfuel  green  energy  materials  science  research  technology  Delicious 
april 2017 by asteroza
http://events.pennwell.com/pgi2016_v14/Custom/Handout/Speaker70049_Session15954_...
Neat work on an oxyfuel turbine using supercritical CO2 exhaust as the actual power cycle
toshiba  allam  cycle  oxyfuel  supercritical  CO2  turbine  power  generator  ASU  Delicious 
january 2017 by asteroza
Advanced CO2Compression with Supersonic Technology
Looks like Dresser-Rand is marketing RamGen CO2 supersonic rampressor work as DATUM-S compressor
ramgen  supersonic  CO2  compressor  ram  inlet  rotary  aerodynamics  research  compression  Delicious 
december 2016 by asteroza
A synthetic pathway for the fixation of carbon dioxide in vitro | Science
Artificial CO2 fixation cycle (CETCH) made from a combo of 11 enzymes found across animals and plants appears to be 2-3 times faster and 25% more energy efficient than the Calvin cycle, but outputs a weird glyoxylate (which can be further converted to other stuff but...) rather than glucose so now just need to stuff a synthetic bacterium with DNA to build and operate those 11 enzymes to see if it really is better than photosynthesis. Primary boost is replacing RuBisCO with the enzyme ECR for better initial CO2 capture.
synthetic  CO2  carbon  fixation  enzyme  cycle  artificial  photosynthesis  biology  research  technology  optimized  designer  organism  metabolism  Delicious 
november 2016 by asteroza
MIT technology used to shrink tumor | MIT News
Omniguide is producing high power laser fiber guides for IR lasers, for use in medical applications, using advanced hollow fibers with the hollow core coated by the new omnidirectional mirrors described here.
CO2  IR  laser  fiber  tunable  mirror  reflector  omnidirectional  materials  science  research  technology  Delicious 
november 2016 by asteroza
IneraTec - Home
Interesting new Gas-to-Liquids conversion system using an innovative microstructured chemical reactor design. Fed by a direct atmospheric CO2 capture unit and an electrolysis unit, it converts CO2 and hydrogen into synfuels
CO2  conversion  GTL  liquid  synthetic  fuel  production  synfuel  syngas  chemical  reactor  Delicious 
november 2016 by asteroza
Defining a performance map of porous carbon sorbents for high-pressure carbon di...
How best to tweak carbon filters for "sweetening" natural gas by removing CO2 from the feed. Though sour gas has other stuff like sulpher that is a different issue...
selective  carbon  sorbent  adsorber  CO2  materials  science  research  technology  gas  filtration  filter  Delicious 
august 2016 by asteroza
Researchers assess power plants that convert all of their CO2 emissions into car...
I wonder if some bright spark in china could run with this and their soft coal powerplants which already power bitcoin mining datacenters...
molten  lithium  carbonate  electrolysis  carbon  nanotube  CNT  production  CO2  CCS  CCGT  materials  science  manufacturing  research  technology  Delicious 
june 2016 by asteroza
Thermodynamic assessment of CO2 to carbon nanofiber transformation for carbon se...
Oh wow, at the current prices for CNT's, you might be able to recover the profit lost on electricity production in a combined cycle powerplant with CCS installed by manufacturing carbon nanotubes from the captured CO2.
CO2  carbon  capture  CCS  molten  lithium  carbonate  electrolysis  nanotube  CNT  production  manufacturing  research  technology  Delicious 
june 2016 by asteroza
Water splitting–biosynthetic system with CO2 reduction efficiencies exceeding photosynthesis | Science
engineered bacteria eat CO2 and H2, output alcohols, so paired with a water cracking catalyst dumping H2 driven by solar panels, can beat natural photosynthesis efficiency
hybrid  biohybrid  symbiotic  artificial  photosynthesis  solar  SolarFuel  biomass  alcohol  biology  materials  science  biosynthetic  electrolysis  catalyst  CO2  carbon  capture  Nocera  Delicious 
june 2016 by asteroza
NetPower
Oxyfuel methane turbine using a supercritical CO2 power turbine.
supercritical  CO2  turbine  SCO2  natural  gas  methane  oxyfuel  power  generator  Delicious 
april 2016 by asteroza
Solar photothermochemical alkane reverse combustion
So high light/pressure/temperature reactor with TiO2 catalyst does a one step conversion of water and CO2 to liquid hydrocarbons.
liquid  hydrocarbon  synfuel  production  photothermochemical  tandem  photochemical  thermochemical  photocatalytic  photocatalyst  alkane  reverse  combustion  UV  light  heat  pressure  titanium  dioxoide  catalyst  water  CO2  cracking  materials  science  research  technology  solar  synthetic  fuel  Delicious 
february 2016 by asteroza
Cooperative insertion of CO2 in diamine-appended metal-organic frameworks : Nature : Nature Publishing Group
Dangling amines on a MOF makes for a low temp swing CO2 adsorbent that beats traditional liquid amine methods currently used at powerplants for carbon capture.
diamine  amine  MOF  metal  organic  framework  CO2  adsorbent  materials  science  research  technology  sponge  separation  carbon  capture  Delicious 
march 2015 by asteroza
CLOSING THE CARBON CYCLE: sunfire GmbH
Apparently they have a good high temperature steam electrolysis SOEC that can produce hydrogen at decent efficiencies, for feeding into a RWGS conversion reactor syngas production rig, to eventually produce synthetic methane (combining syngas from the reactor with additional H2 from the SOEC), or eventually via FT, synthetic liquid fuels. They don't seem to be doing a coelectrolysis SOEC to crack steam and CO2 simultaneously in the same cell stack though.
SOEC  solid  oxide  electrolysis  cell  high  temperature  water  H2O  steam  CO2  syngas  production  synfuel  synthetic  fuel  methane  CH4  liquid  GTL  hydrogen  Delicious 
november 2014 by asteroza
SANDIA PROGRESS ON ADVANCED HEAT EXCHANGERS FOR SCO2 BRAYTON CYCLES
Interesting take on 3D printed lost wax style cast metal heat exchangers, similar to PCHE's with advanced features like airfoils.
CMHE  cast  metal  heat  exchanger  research  technology  supercritical  CO2  3D  printing  fabbing  Delicious 
november 2014 by asteroza
Recent Advances in Power Cycles Using Rotating Detonation Engines with Subcritical and Supercritical CO2
So rocketdyne has been doing interesting RDWE plasma assisted combustors, in this case intended for oxyfuel powerplants with CO2 capture
aerojet  rocketdyne  RDE  RWDE  PDE  rotating  wave  detonation  engine  pressure  rise  combustor  supercritical  CO2  combustion  cycle  oxyfuel  gas  turbine  research  technology  pulse  pulsed  plasma  assist  carbon  capture  Delicious 
november 2014 by asteroza
Home - climeworks.com
An actual direct air capture system in commercial operation
air  carbon  capture  CO2  direct  green  heat  swing  amine  granulate  porous  media  filter 
october 2014 by asteroza
Swellable, Water- and Acid-Tolerant Polymer Sponges for Chemoselective Carbon Dioxide Capture - Journal of the American Chemical Society (ACS Publications)
Interesting CO2 sponge that uses a physical swelling mechanism in it's pores to capture CO2 at high pressure while rejecting water, but releases at low pressure. So sorta pressure swing style adsorbent?
CO2  carbon  capture  polymer  sponge  high  pressure  materials  science  research  technology  organic  hydrophobic  swelling  expansion  selective  gas  adsorbent  Delicious 
august 2014 by asteroza
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