The present invention relates, in general, to a system and method for focusing gas distribution through at least one three-dimensionally (3D) printed lattice heating elements within an electric catalyst unit to promote ammonia dissociation. The present invention allows gaseous ammonia to be continuously heated under turbulence as it flows through non-linear paths within a 3D printed lattice heating element. The lattice structure of the heating element provides a balance between surface area and heat dissipation, allowing the heating elements to reach a suitable temperature to perform ammonia dissociation, but which are not oversaturated with heat which could result in failure or melting of the heating element.