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GSR® 5 and D-PriSM® are gasoline sulfur reduction additives in the Grace GSR® clean fuels additives technology portfolio. Many refiners are using GSR® 5 and D-PriSM® additive technology to comply with new legislations, such as Tier 3 and Euro 5 gasoline regulations. Because FCCU gasoline contributes up to 90% of the sulfur to the gasoline pool, this has highlighted the importance of reducing sulfur directly in the FCC unit. In-unit reduction of FCCU gasoline sulfur with Grace's patented GSR® additive technologies provides refiners opportunities for feedstock blending, gasoline stream blending, and operating flexibility during hydrotreater outages. The same benefits of the GSR® clean fuels additive technology can also be supplied in the SuRCA® family of catalysts.