3.1.1.4.3 No article after preposition de, if it is required by the verb
Example
J'
ai
besoin
d'
argent.
I
have
need
of
money.
(I
need
money)
Many verbs require a certain preposition, one example is avoir besoin de quelque chose. If this preposition de is required by the verb, there is no article used with it. We will get back to this group of verbs later on.