The damage of carbon monoxide and carbon dioxide in hydrogen to hydrogenation catalysts
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Let’s discuss what harm carbon monoxide and carbon dioxide in hydrogen pose to hydrogenation catalysts, and what effects they have on them
When carbon monoxide is hydrogenated, methane and water are produced; three parts of hydrogen are required for every part of carbon monoxide. This not only consumes hydrogen but also releases a large amount of heat, causing the temperature in the reaction system to rise sharply and disrupting normal operation. Excess levels of carbon monoxide can cause catalyst poisoning – when the new hydrogen contains 2% carbon monoxide, the catalyst’s activity can decline rapidly. The presence of carbon dioxide not only reduces the purity of hydrogen but also reacts with the ammonia produced by hydrogenation to form ammonium salts, which crystallize at low temperatures and block the pipes, increasing the system pressure drop. Generally, the carbon dioxide content in fresh hydrogen is required to be less than 0.5%.
How severe is the damage to copper-based catalysts caused by excessive sulfur content in the exhaust gases from methanol synthesis?
I agree with the opinion from the second floor, but generally, the requirement for CO+CO2 levels in hydrogenation catalysts is less than 50 PPm, not 0.5%; 0.5% is too high for catalysts!