The EM-2300 catalyst is at the heart of the unique performance and superior yields of the PxMax℠ process. The catalyst is manufactured using a proprietary ex-situ selectivation technique which increases the relative diffusivity rate of paraxylene versus those of the larger isomers. As a result, the PxMax℠ process yields ultra-high paraxylene selectivity at SOC (> 96%). Paraxylene selectivity further increases as the cycle progresses making the PxMax℠ process by far the most paraxylene selective STDP process on the market.