The effect of the metal content in the catalyst on the reaction
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For example, what effect does an increase in nickel content from 10 to 20 have on the reaction?
The poisoning effect of heavy metals on catalysts is mainly due to the fact that catalyst particles are covered with numerous micropores; these metals cannot pass through these pores and can only deposit on the surface of the catalyst, covering its active sites and thereby reducing the catalyst’s activity； It also prevents oil molecules from entering the catalyst’s micropores, causing the catalyst to become inactive and shortening the operational life of the device. Therefore, feed to general equipment is equipped with filters to remove most impurities. When these impurities exceed the specified limits, they will inevitably accelerate catalyst poisoning.
It’s possible I’m wrong; for example, in the catalyst with an oxidation state where the nickel content is 10 and the molybdenum content is 6.6, if I now use a catalyst from another manufacturer with a nickel content of 20 and a molybdenum content of 11, while the carrier remains the same, what impact will that have on the reaction?
It should promote the reaction, because with a higher metal content in the catalyst, more hydrogenation reactions will occur per unit volume of catalyst (with the specific surface area remaining unchanged). Moreover, what is increased is the same amount of metal as before; it’s not that a different type of catalyst is used. It can also be understood in a similar way: an increase in airspeed should work as well. I personally think it should be like this.
Catalyst manufacturers certainly aim for the highest possible catalytic efficiency within the limits of these calculations; the prerequisite for meeting market demands is safety, reliability, and cost-effectiveness. If too much active metal is incorporated, it may lead to uncontrollable situations in the manufacturing process.
I misunderstood; I didn’t read the question carefully. I’m not sure about this. Can it be understood that the metal content refers to the amount of substance in the catalyst’s active centers? By increasing the metal content within a certain range, does it mean increasing the number of metal-active molecules in the catalyst, raising the proportion of its active surface area, and thereby enhancing the catalyst’s activity? However, the current trend in catalyst development is to save costs by reducing the metal content as much as possible.
I didn’t understand the question posed by the original poster – was it asking about the level of active metal content in the catalyst, or about the amount of heavy metal toxins present in it?