Effect of organotins in gasoline on exhaust emission from car

Abstract

The effect on exhaust gas emissions of carbon monoxide, CO, and hydrocarbons, HC, resulting from mixing methyl tert-butyl ether (MTBE), isopropanol (IPA), and tetrabutyltin or tetrahexyltin with gasoline for automotive fuels has been studied experimentally. Tests were conducted on a Toyota four-cylinder engine running at different conditions of spark timing and engine speed. Results of this investigation indicate that the presence of the MTBE, IPA, and organotins (tetrabutyltin or tetrahexyltin) in the fuel blend significantly reduce the concentration of carbon monoxide in the exhaust emissions (up to 30-40 percent compared to base fuel), with tetrabutyltin slightly more effective than tetrahexyltin. Hydrocarbon emissions were only slightly decreased in this experiment.