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(A) selection principles cobalt-molybdenum-based catalyst 

 

Cobalt-molybdenum-based catalysts have outstanding resistance to sulfur, which applies to coal, heavy oil (or residual) as raw material ammonia plant; less in the absence of H2S H2S environment, relatively poor activity usually does not apply to light oil and natural gas as raw material ammonia plant. 

 

(2) Notes cobalt-molybdenum catalyst selection when 

 

The main carrier of cobalt-molybdenum catalysts are usually used for: Al2O3, Al2O3 / MgO. A catalyst in which alkali metals are often added as a cocatalyst and potassium, to improve low-temperature activity. In the selection of a specific catalyst, not only pay attention to the activity of this catalyst, but also pay attention to their strength. Generally, as a catalyst for the majority of manufacturers use to get the trust of its catalyst activity itself should not be a problem. However, the activity of the catalyst is generally inversely proportional to the intensity, that is, the better activity, the strength of the catalyst itself, some will be relatively poor, and of course, the manufacturer as a catalyst in the manufacturing process of the catalyst, both of which have been taken into account relationship and find a certain balance, but this balance is not suitable for any working conditions, so as to use a catalyst manufacturers, in the selection of the catalyst, but also need to find a balance point of its operation, to prevent its strength than poor, resulting in the catalyst bed resistance is too large, affect the entire system of production. As a low-temperature shift catalyst, and in the selection of the cobalt-molybdenum catalyst, try to use small particle size of the catalyst, can increase the effective activity of the catalyst per unit volume, but also pay attention to the bed pressure drop allowed. In addition, when using hydrogen gas containing oxygen and a half of water, but also a good selection of anti-drug and anti-performance agents, to prevent oxygen affects the life of the catalyst. 

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