Parameters of methanation catalysts
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The operating conditions of methaneation catalysts from various manufacturers, including temperature and pressure, space velocity, activity, selectivity, etc. What are the main side reactions of methanation, and what are the conditions for its occurrence?
It is a disproportionation reaction, CO=CO2+C
Different catalysts have different performances; your question is too general
At present, the coal-to-natural gas projects have not yet started operation; the first reactors use catalysts imported from abroad. This information is kept confidential at the moment, so it’s difficult to obtain
Typical methanation catalysts are used at temperatures ranging from 250 to 750 degrees, with space velocities of 5000 to 30,000 h-1. The activation temperature is generally around 200 degrees; selectivity depends on the feed gas, as the methanation reaction is under thermal equilibrium control. The main reaction is the methanation reaction, with very minor side reactions; if any do occur, they are in extremely small quantities. Low-carbon alcohols may be produced under certain conditions.
Could you talk about low-carbon alcohols? Thank you very much!
Reply to 5# kkxxzyb: \"The volumetric flow rate is 5000–30,000 h^-1\" – does this refer to the NM^3/m^3 of the catalyst’s packed volume? In other words, is it the volume (capacity) flow rate under standard conditions (0 oC, 1 atm) divided by the catalyst’s packed volume? Thank you for your guidance.
This post was last edited and replied to by kkxxzyb on 2011-12-15 at 14:09. Reply 5# kkxxzyb: For methanation (nickel-aluminum catalyst system), the space velocity is 2000–30000 hr-1. What is the typical methanation residence time? Isn’t it important? Thank you.
Reply to 5# kkxxzyb: I’m sorry; the post I made earlier was an accident. Please forgive me. But I indeed have this problem and need your help. Thank you.
Replying to floor 9: The volumetric flow rate is obtained by multiplying the air velocity by the catalyst loading volume; the linear velocity through the catalyst bed is then obtained by dividing this value by (the cross-sectional area * the porosity of the catalyst bed). Finally, the residence time is obtained by dividing the linear velocity by the height of the catalyst bed.
Reply to 10# kkxxzyb: What was said above is correct; it’s just a complicated way of putting it. The actual simple calculation method is: residence time = 1/air velocity. In other words, the residence time is the reciprocal of the space velocity.