Separation of hydrocarbons by degree of branching is a very important issue in the development of suitable
technologies for enhancing octane number in gasoline fuels. This separation is usually performed by adsorption processes
using molecular sieves; hence, a review of these technologies is on demand. This review is devoted to the experimental
results on the separation of branched and non-branched C4-C10 hydrocarbons presented in gasoline by means of molecular
sieve materials. Experimental gas and liquid phase studies using adsorbents like silicalite, ZSM-5, beta and Y zeolites,
ZSM-22, ZSM-23, mordenite, carbon molecular sieves, metal organic frameworks and other hybrids materials are presented.
Separation capabilities in gas and liquid phase experiments on single and multiple hydrocarbon mixtures for several
adsorbents were analyzed in order to reach a conclusion regarding the use of this type of materials on a commercial
procedure. Nevertheless, according to this research from the vast array of materials tested, only the following adsorbents
have been included in patented procedures: ZSM-5, ZSM-11, ZSM-23, NU-85, NU-86, NU-87, SSZ-25, SSZ-37, MCM-
22, ERB-1, ITQ-1, PSH-3 and a PVDC derived CMS. The reason behind this lack of advancement may relay on the need
of a coupled state of the art isomerization process for the C5-C10 hydrocarbon feeds, and in the design of a material with
high adsorption capacity, high selectivity, and high regeneration properties, capable of enduring the complexity of a real
feed separation process.