Petroleum Refinery Engineering
The main reaction in reforming is the

Hydrocracking of paraffins
Hydrogenation of naphthenes
Saturation of olefins
Dehydrogenation of naphthenes

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Petroleum Refinery Engineering
Asphalts are

Desirable in catalytic cracking feedstock, because they produce coke
All of these
. Low molecular weight & low boiling point compounds present in petroleum
Readily oxidisable and form carbonaceous sludge

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