Method for manufacturing an ammonia storage cartridge, in particular for a motor vehicle exhaust system

A method for manufacturing an ammonia storage cartridge, in particular for a motor vehicle exhaust system, including:

• providing a material capable of absorbing or adsorbing ammonia, at least partially saturated with ammonia,
• producing an intermediate element having a general shape of revolution around a central axis, including compacting the material to form the intermediate element, wherein the compacting of the material is done at a first pressure and alters a density of the material compacted,
• stacking at least two intermediate elements in a stacking direction such that the central axes of the at least two intermediate elements are aligned with each other and are parallel to the stacking direction, the at least two intermediate elements being stacked in a shell of the ammonia storage cartridge;
• and
• compressing, in the stacking direction, the stack of the at least two intermediate elements in the shell, wherein the compressing of the stack of the at least two intermediate elements is done at a second pressure that is lower than the first pressure, and wherein compression of the stack of at least two intermediate elements in the shell does not alter the density of the material.