true or false

(7) LPG is obtained by distillation of crude oil below 35C. The main components are propane and butane. The main components are propane and butane, with extremely low sulfur and nitrogen content.

(8) Hydrodesulfurization, which removes sulfur (S) in oil refining, uses catalysts with Co and Mo as active ingredients, and is an essential process in the refining of light oil and gasoline fractions.

(9) "Fluid catalytic cracking" is a reaction in which hydrogen is added to hydrocarbons of petroleum components to shorten long carbon chains, and catalysts using zeolites are widely applied.