“…In the particular case of the dehydration of alcohols on aluminic materials, a domain that has been widely investigated both experimentally − and theoretically, − the issue of the interactions between adsorbed species has been raised in a number of studies. Water formed during the reaction and readsorbed on the catalyst is postulated either as an inhibitor of the reaction ,,,− , or as a potential anchoring site for incoming alcohol. , Interactions between coadsorbed alcohol molecules are obviously required for the bimolecular formation of ether ,,,, but have sometimes been proposed to have inhibiting effects on the dehydration reaction. , Determining where and how these interactions establish on the surface, and to what extent they influence the catalyst activity and the alkene/ether selectivity as conversion increases (i.e., as less and less alcohol and more and more water competing for adsorption are present in the gas phase) is a challenging question that has not yet been addressed satisfactorily.…”