Ammonia storage cartridge with optimized filling time, in particular for a motor vehicle gas exhaust system

An ammonia storage cartridge, in particular for a motor vehicle gas exhaust system, comprising:

• an ammonia storage member, comprising a storage material capable of absorbing or adsorbing ammonia, the ammonia storage member extending along a longitudinal axis;
• a heating element designed to heat the ammonia storage member;
• and
• a hermetic tank in which the ammonia storage member is housed, wherein the ammonia storage cartridge includes a tubular element for ammonia circulation in fluid form, the tubular element arranged coaxially to the ammonia storage member such that the tubular element includes:
• a first surface at least partially delimiting, with an element chosen from among the heating element and the hermetic tank, a circulation duct for fluid ammonia,
• a second surface, arranged at least partially in contact with the ammonia storage member,
• at least one orifice passing radially through, allowing the circulation of fluid between the circulation duct and the ammonia storage member,
• the ammonia storage member has a general tubular shape along the longitudinal axis, said tubular shape being radially delimited between an outer wall and an inner wall, said inner wall delimiting an inner space,
• the tubular element is arranged in said inner space, the tubular element having a first surface comprising an inner surface, and a second surface comprising an outer surface arranged at least partially in contact with the inner wall of the ammonia storage member, and
• the heating element being arranged inside the tubular element and coaxially to the tubular element, the inner surface of the tubular element being arranged at least partially in contact with the heating element, and the recirculation duct being radially delimited by the inner surface and by the heating element,
• wherein the tubular element has, in a plane perpendicular to the longitudinal axis, a serrated shape comprising inner indentations alternating circumferentially with outer indentations, such that:
• in each inner indentation, the inner surface of the tubular element is in contact with the heating element, and
• in each outer indentation, the outer surface of the tubular element is arranged in contact with the inner wall of the ammonia storage member, and the inner surface of the tubular element delimits a respective circulation duct with the heating element, and
• each orifice is formed in an outer indentation.

An ammonia storage cartridge, in particular for a motor vehicle gas exhaust system, comprising:

• an ammonia storage member, comprising a storage material capable of absorbing or adsorbing ammonia, the ammonia storage member extending along a longitudinal axis;
• a heating element designed to heat the ammonia storage member;
• and
• a hermetic tank in which the ammonia storage member is housed, wherein the ammonia storage cartridge includes a tubular element for ammonia circulation in fluid form, the tubular element arranged coaxially to the ammonia storage member such that the tubular element includes:
• a first surface at least partially delimiting, with an element chosen from among the heating element and the hermetic tank, a circulation duct for fluid ammonia,
• a second surface, arranged at least partially in contact with the ammonia storage member,
• at least one orifice passing radially through, allowing the circulation of fluid between the circulation duct and the ammonia storage member,
• the ammonia storage member has a general tubular shape along the longitudinal axis, said tubular shape being radially delimited between an outer wall and an inner wall, said inner wall delimiting an inner space,
• the tubular element is arranged in said inner space, the tubular element having a first surface comprising an inner surface, and a second surface comprising an outer surface arranged at least partially in contact with the inner wall of the ammonia storage member, and
• the heating element being arranged inside the tubular element and coaxially to the tubular element, the inner surface of the tubular element being arranged at least partially in contact with the heating element, and the recirculation duct being radially delimited by the inner surface and by the heating element,
• wherein the tubular element has, in a plane perpendicular to the longitudinal axis, a circular shape, and the heating element has, in that same plane, a serrated shape comprising indentations alternating circumferentially with hollows, such that:
• each indentation is arranged in contact with the inner surface of the tubular element, and
• each hollow delimits a respective circulation duct with the opposite inner surface of the tubular element.