Methanation Technology And Catalyst

Methanation is the hydrogenation of carbon monoxide and carbon dioxide to methane using a catalyst. This method can reduce carbon oxide to less than 10ppm, but requires the consumption of hydrogen.

 Methanation Catalyst: Echo of hydrogenation 

 CO+3H2=CH4+H2O+206.16KJ

 CO2+4H2=CH4+2H2O+165.08KJ

In the presence of oxygen, oxygen and hydrogen will echo to form water. When the temperature is lower than 200℃, nickel in methanation catalyst will echo with CO to form nickel carbonyl: Ni+4CO=Ni(CO)4

Therefore, to prevent low temperature, CO and nickel catalyst contact, so as not to affect the activity of the catalyst.The reverberation equilibrium constant of methanation decreases with the increase of temperature. As a methanation technology for the purification and removal of CO and CO2, the reverberation temperature is generally between 280 and 420℃, and the equilibrium constant values are very large. Under the pressure of 400℃ and 2.53Mpa, the calculated equilibrium contents of CO and CO2 are at the level of 10-4ppm.The activation temperature of the methanation catalyst developed by Hunan Anchun Company is 210℃

It is between 220 and 430℃.

The inlet temperature increases, the amount of catalyst is reduced, and the pressure drop and power consumption are greatly reduced.This partial technology has been particularly mature in China, and applied for many years.

At present, methanation technology has been used in large-scale synthesis gas to produce natural gas, so the biggest problem is the temperature resistance of the catalyst and the design and manufacture of strong exothermic echo.