Olefins from catalytic cracking products
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In the products of catalytic cracking, the lighter the oil, the higher the olefin content in the products. Why?
From the perspective of the reaction mechanism, olefins are more prone to cracking than alkanes; after cracking, another olefin is formed, which results in a high content of light olefins
In terms of molecular structure, double bonds represent an unstable configuration. When the molecular weight is high, a large number of molecules come together, and saturated molecules such as alkanes become the dominant type. Double bonds found in compounds like alkenes undergo saturation reactions to some extent, which is why there are relatively few alkenes in large molecules.