The impact of changes in various components of the catalyst on production
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What impact do changes in the ratios of NI, Fe, and V, as well as changes in specific surface area, and variations in pore size, have on production in the equilibrium catalysts of catalytic cracking units? ? ?
Excess levels of heavy metal ions can cause poisoning of the catalyst to varying degrees and in different ways, leading to a decrease in its selectivity; changes in specific surface area and pore size can also result in a reduction in the catalyst’s activity
Ni is a natural dehydrogenation catalyst, so it causes the coke and dry gas in the product to increase, as the hydrogen in the dry gas increases.
The oxide of v will destroy the crystal structure of the catalyst, causing it to break down; in other words, its structure is ruined.
In catalyst deactivation caused by toxins, nickel and vanadium are typically considered as key elements to be guarded against; nickel has an impact on selectivity 4-5 times greater than that of vanadium. Foreign catalytic cracking feedstocks contain more vanadium, which has a greater impact than nickel. Our country’s raw materials have a high nickel content and a low vanadium content.