CO2 into CO - Updated

 CO2/CO reduction theme is currently hot in ecology, engineering and applied science.

Several CO2/CO reduction promising possibilities would be compared here by their low carbon footprint, cheapness, energy efficiency. Now mainstream in the issue is electrochemistry  vs. my approach is classical chemistry and cheap energy from Renewables and heat from the own chemical processes was used. 


Simplest C + air =  CO + 110 kJ is given here to compare it with my approach, using extremally cheap  renewable primary energy of down to about 0.4 US cent / kWh, 5 years payback by generators specially invented by me. 

If C being USD 120 /ton carbon, CO = ( 12 * 120 -  110,000 / 3.6) / 28 =  (1440 - 30,556 kWh * 0.25 efficiency from heat in electricity} /28 = 51 - 270 kWh * 0.03 = USD 43 / ton CO + Capex. It consumes C, 12 ton /28 ton CO = 12/28 =  0.43 ton C per 1 ton CO product, but without CO2 exhaust. 

C + H2O = CO + H2  - 176 kJ. here CO can be sold per USD 40.0 / ton CO: so H2 = (12 * 120 - 28 * 40 + 176 * 4 / 3.6 ) / 2 = USD 260.0 / ton  H2.  

(1) CO2 + H2 = (CO2H2 - formic acid) = CO + H2O + 3 kJ : CO = ( 44 * 5  + 2 * 260 ) / 28 = ( 220 + 520) / 28 = USD 26.4 / ton CO.  And totally = ( 26.4 + 40 ) / 2 = USD 33.2 / ton CO2. 
(2)  Boudouard reversible reaction with near 100% yield at mild conditions : 0.5 CO2  + 0.5 C = CO - 86 kJ; CO =  (0.,5 * 12 * 120 + 0.5 * 44 * 5 + 86 * 4 / 3.6 ) / 28 = USD 32.7 /ton CO. 0.2 ton C / ton CO. 

  References.

[1] CO2 mass production from the air very cheaply, judbarovski.blogspot.com/2025/01. posted on 12.01.2025. 

[2] Breakthrough cheap Re energy, davidjud.blogspot.com.2024/06, posted on 21.06/2024; 
[3] CV-2023, davidjud.blogspot.com/2023/04, posted on 27.04.2023. 
 

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