A semiconductor structure with reduced inter-diffusion is provided. The single-piece swirler includes a center body extending axially along the single-piece swirler, a first fuel passage inside the center body, and a plurality of vanes extending radially from the center body. When the traffic exceed a predetermined threshold value, traffic is adjusted on the inner or outer cell. Iron sulfide agglomerations also provide consistent and improved sulfur recoveries compared to granulated iron sulfide additions with little to no sulfur odor.