Primary alcohols (ethanol, 1-propanol, 1-butanol, and 1-pentanol) derived from biomass offer a sustainable fuel source that can improve efficiency while reducing carbon dioxide (CO 2 ) emissions. However, the performance of these primary alcohols in spark-ignited engines is relatively unknown. In this paper, the performance of primary alcohols was experimentally determined using the Research Octane Number (RON) and the Blending Research Octane Number (BRON). The primary alcohol mixture, or "AlcoMix," consists of 75% ethanol, 11% 1propanol, 8% 1-butanol, and 6% 1-pentanol, and was approved by the U.S. EPA for use with blending in gasoline. This mixture is the probable outcome of thermochemical conversion of biomass using Fischer-Tropsch chemistry with synthesis gas. The purpose of this research is to determine if AlcoMix is a suitable replacement for Ethanol in fuel blending as an anti-knock blending component for spark-ignited engines. As an indicative measure for knock resistance, the RON of AlcoMix and ethanol were estimated using a modified, validated method in a CFR engine. The anti-knock properties of the AlcoMix as a blending component in gasoline were determined by estimating the BRON. The results show that the measured RON values of the individual primary alcohols closely match published values. Additionally, the RON and BRON of the primary alcohol mixture nearly match those of ethanol. These results indicate that the primary alcohol mixture produced by thermochemical processes could be used as a substitute for ethanol as a primary fuel or as an anti-knock blending component.
INTRODUCTION