ABSTRACT
Pure dimethyl ether (DME) works well as a diesel fuel, producing very low particulate emissions with NOx emissions similar to current diesel fuel. A liquid fuel or fuel additive, retaining high cetane but lowering emissions, would be attractive and avoid the problems associated with DME. Di-methoxymethane (DMM) may be such a fuel. This chapter compares particulate and gaseous emissions from a DMM/diesel fuel blend in a diesel passenger car operated over the three phase Federal Test Procedure (FTP) to those for the base diesel fuel. It is clear that adding 16.6% DMM reduces the particle mass emissions for the FTP cycle by an amount much larger than the volume fraction of DMM added, consistent with the results obtained by others. Transient particle measurements during the FTP were made with both the scanning mobility particle sizer (SMPS) and the electrical low pressure impactor, but too few tests were conducted to construct a meaningful set of size distributions from the SMPS data.
