Chemistry, Catalysts, and Processes for Isoparaffin–Olefin Alkylation: Actual Situation and Future Trends

Abstract
As a consequence of the Clean Air Act (CAA), beginning in 1990, USA refiners were forced to change their strategy in order to meet the new mandatory specifications on gasoline composition. The targets established by the CAA were directed to overcoming environmental problems by reducing the ground-level ozone-forming and carbon monoxide emissions from vehicles, as well as toxic hydrocarbons and SO, and NO, emissions in auto exhausts. In order to accomplish this, gasolines had to move in the following direction:

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