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"A Trade Study on Sabatier Co2 Reduction Subsystem for Advanced Missions
Document Number: 2001-01-2293
Date Published: July 2001
Author(s):
Frank F. Jeng - Lockheed Martin Space Opeations
Chin H. Lin - NASA Johnson Space Center
Abstract:
An analysis on O2 usage, water contents in food, CO2 and H2 availability, water generation capability of CO2 reduction subsystems, water balance, etc., was conducted to evaluate the feasibility of integrating a CO2 reduction subsystem into an air revitalization system.
The effects of CO2 reduction subsystem operating parameters on water recovery efficiencies and water generation capabilities were analyzed. Water mass balances for advanced missions were conducted for advanced missions. Equivalent system mass method was used to calculate payoff time for integrating the CO2 reduction subsystem into an air revitalization system. Decision criteria based on payoff time for integrating a CRS for advanced missions were developed."
Please note that the term "reduction", as used herein, has a dual meaning. The amount of Carbon Dioxide is physically reduced by, in the technical sense, chemically "reducing" it, i.e., "de-oxidizing" it, into it's basic components, Carbon and Oxygen.
And, with some extrapolation, we infer that the technology exists to, by recycling a much-demonized coal use by-product, effect the "revitalization" of our planetary "air".
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"Paul Sabatier
The Nobel Prize in Chemistry 1912Nobel Lecture, December 11, 1912
The Method of Direct Hydrogenation by Catalysis
V. I. Sobolev, K. A. Dubkov, O. V. Panna and G. I. Panov
Boreskov Institute of Catalysis, Novosibirsk 630090, Russia
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"Conversion of Carbon Dioxide into Methanol with Silanes over N-Heterocyclic Carbene Catalysts |
Siti Nurhanna Riduan, Yugen Zhang, Dr., Jackie Y. Ying, Prof. |
Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669, Fax: (+65) 6478-9020 |
Activate and reduce: Carbon dioxide was reduced with silane using a stable N-heterocyclic carbene organocatalyst to provide methanol under very mild conditions. Dry air can serve as the feedstock, and the organocatalyst is much more efficient than transition-metal catalysts for this reaction. This approach offers a very promising protocol for chemical CO2 activation and fixation." In this case, it appears the researchers are relying in a Hydrogen-donor solvent, silane, to supply the needed Hydrogen for the hydrogenation of CO2, as WVU relies, in the West Virginia Process, on the solvent tetralin to supply Hydrogen for the liquefaction of coal. The point of this, Mike, as we have previously documented, is that CO2 can be extracted in a practical way from the atmosphere itself, and recycled, in economical, i.e. "very mild", ways into the versatile liquid fuel, and gasoline and organic chemical precursor, Methanol. We don't have to tax, through Cap and Trade, our coal industries out of business because we're afraid of something that, if we applied ourselves to the task, would prove to be a quite valuable by-product of our coal use. |
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Fanor Mondragon, Hironori Itoh and Koji Ouchi
Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
Liquefaction of coal was carried out in a zinc—water—solvent system to give a product with high concentration of pyridine and benzene solubles. In this system the metal reacts with water to produce the corresponding metal oxide and hydrogen. This hydrogen was used for in-situ hydrogenation of coal. The effects of reaction time, temperature, type of solvent, the quantity of metal used and the rank of coal were investigated. The solvent has a very marked effect on the conversion of coal to benzene-soluble materials, especially at short reaction times. A maximum benzene conversion of 96% for Taiheiyo coal was obtained when it was treated at 445 °C for 1 h using wash oil as solvent. With regard to the influence of coal rank it was found that low rank coals were more reactive than high rank coals. The amount of preasphaltene is only slightly influenced by coal rank but depends on the temperature and the type of solvent used.
Fanor Mondragon and Koji Ouchi
Faculty of Engineering, Hokkaido University, Sapporo 060, Japan
Abstract
Model compound studies were carried out to elucidate the reaction mechanisms taking place during the liquefaction of coal with the hydrogen produced from the reaction of zinc and water. In compounds of the type Ph-(CH2)n-Ph the splitting of the aliphatic bridge was easier with higher n values. Ether type compounds such as diphenylether were unreactive although the C-O bond in dibenzylether was easily cleaved. Condensed ring aromatic compounds gave low conversion with hydrogenation being facilitated by an increase in ring number. Phenolic compounds such as phenol did not react well, but the reactivity increased with increase in aromatic ring size. The cleavage of the aliphatic bridge was accelerated by the OH group, for example, in the case of 4-hydroxydiphenylmethane bond scission was about 15 times higher than that of diphenylmethane. Heterocyclic compounds were unreactive."
Make special note that, in the first Abstract, these researchers report achieving a 96 percent conversion rate of the coal they used in their development work into, essentially, petrochemicals soluble in an organic solvent, when zinc was included in the coal/water starting "mix".
We should note that Zinc is oxidized in these reactions and would, at some point, need to be "refreshed", or, in technical terms "reduced", by removing the oxygen and then recycling the zinc back into the coal liquefaction process.
Refining and recycling the zinc oxide is not difficult.
Without direct reference, we relate that, in Israel, some work has been done on developing Hydrogen-fueled automobiles. Rather, though, than attempting to fuel cars directly with Hydrogen, and then having them zip about the highways like 70 mile-per-hour mini-Hindenburg's, the Israeli's are developing prototypes that would fill up with water, and then convert the water, over on-board Zinc, into Hydrogen and Oxygen, as needed. The spent Zinc Oxide would be exchanged for fresh Zinc, and then "renewed" at a central refinery where the Zinc Oxide would be reduced, via solar energy, back into pure Zinc and Oxygen.
Note that such a concept would be unlikely to work that well in the US. Driving range would almost certainly be a problem, as hydrogen just doesn't have the energy density of liquid hydrocarbons. Even with a full tank of water, these Israeli concepts would be unlikely to have more range than a battery-powered electric vehicle, which might be fine for a physically very small country, like Israel.
But, the same recycling concept could work for coal-to-oil conversion refineries using Zinc to fission water for Hydrogen, even though we don't have that many sunny deserts handy to provide us with abundant solar power. Spent Zinc Oxide could be refreshed, perhaps, in coal furnaces, or in crucibles heated by coal-generated electricity; or, by environmentally-correct hydroelectric power.
In any case, this is yet another demonstrated channel for the conversion of our abundant coal into needed liquid fuel, and of effecting that conversion using widely-availabe, non-exotic, recyclable materials.
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"UOP and University of Southern California developing technology to produce cleaner-burning fuels from carbon dioxide
Technology to produce methanol and dimethyl ether from CO2 aimed at reducing greenhouse gases
13 Dec 2007 - UOP LLC, a Honeywell company, announced that it will partner with the University of Southern California's (USC) Loker Hydrocarbon Research Institute to develop and commercialize new technology to transform carbon dioxide into clean-burning alternative fuels.USC developed fundamental chemistry to transform carbon dioxide to methanol or dimethyl ether, two potentially cleaner-burning alternatives to traditional transportation fuels...
