What is the collective noun for brochure?

There isn't a widely accepted or commonly used collective noun specifically for brochures.

You could use a general term like:

* Stack of brochures

* Pile of brochures

* Set of brochures

* Collection of brochures

* Assortment of brochures

You could also get creative and use a term that reflects the purpose or content of the brochures:

* Spread of travel brochures

* Catalog of product brochures

* Portfolio of marketing brochures

Ultimately, the best collective noun to use depends on the context and what you want to emphasize.