This document summarizes a study on controlling aldehyde emissions from a 4-stroke spark ignition engine using methanol-blended gasoline with an improved catalytic converter design. The engine was tested with a conventional combustion chamber and one with a copper coating. Different catalysts including sponge iron and manganese ore were tested in the catalytic converter. Results showed that the copper coated chamber and catalytic converter with air injection reduced aldehyde emissions more effectively than other configurations tested.