Patent ID: 7235706

Claim:
A process for preparing light olefins by dehyrogenation of the corresponding paraffins, consisting of: reacting said paraffins in a reactor, operating at a temperature ranging from 450 to 800° C., a pressure ranging from 0.1 to 3 atm absolute and a GHSV ranging from 100 to 10000 h −1 , with a catalytic system containing gallium, platinum, optionally one or more alkali or alkaline earth metals, and a support consisting of alumina in delta or theta phase or in delta+theta or theta+alpha or delta+theta+alpha mixed phase, modified with silica, the gallium, expressed as Ga 2 O 3 , being in a quantity ranging from 0.1 to 33.6 wt %, the platinum being in a quantity ranging from 1 to 99 ppm, the alkali or alkaline earth metals, expressed as oxide, being in a quantity ranging from 0 to 5 wt %, and the silica being in a quantity ranging from 0.08 to 3 wt %, the remainder up to and including 100% being alumina, and regenerating said catalytic system in a regenerator by burning off the coke which has deposited on its surface, operating at a temperature exceeding 400° C.