Shift catalysts
Introduction
Shift catalysts are used to transform syngas composition by increasing the amount of hydrogen while simultaneously reducing the CO content. These catalysts are commonly used in ammonia, hydrogen and methanol plants, and used to remove residual CO.
Medium Temperature Shift Catalyst Advantages:
• Low sulfur content in its body. Sulfur in body is less than 200ppm.
• High crush strength. Is not easy to shatter or crack after long time run
• Wide range of operating temperature. Qualified CO slippage under 300~500 ºC and shows fine operating flexibility
• Good sulfur resistance. Activity is stable even under condition of 0.3g/Nm3 H2S.
• Low steam consumption
• Good boiled water resistance and long service life.
Application
Shift catalyst is used for accelerating the reaction of CO with H2O to produce CO2 and H2 at high temperature(290~500ºC)
CO +H2O= CO2+H2
ΔH=-41.16Kj/mol
The reaction is exothermic. Higher conversions are favored by lower temperatures and higher ratios of steam. According to kinetics lower temperature will be lower reaction speed. So an appropriate temperature should be selected correctly. To avoid steam condensation operating temperature should be 20~30ºC over steam dew point.
CO shift catalyst physical property
It is normally manufactured according to the customer's process condition.
General physical properties are as follow:
Appearance: Brown cylinder tablet
Size: Ø9×6~8mm or Ø6×6~5mm and special size can be supplied at users request
Bulk density: 1400~1600kg/m3
Radial crush strength: 205N/cm MIN
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