Abstract: The present invention relates to a process for preparing a zeolite ZSM-5 presenting a Si/Al molar ratio comprised between 2 and 8, preferably between 3 and 8, comprising the following steps: a) mixing at least one silicon source, at least one aluminum source, at least one organic template and at least one aqueous solvent, in order to obtain a synthesis mixture in solution or gel form; b) ageing the mixture obtained in step a) at a temperature of between 20° C. and 200° C. during at least 30 minutes; and d) crystallizing the resulting mixture during at least 24 hours, wherein a step c) of adding wood lignin or oxidized wood lignin to the mixture is performed after step a) or after step b). It also relates to a zeolite which is obtainable by such a process, and to its use.