In motor vehicles, CO is produced by the incomplete combustion of a fuel. In a methanol-fueled fuel cell, CO is produced during the initial reforming process. Since CO can 'poison' the catalyst in the fuel cell, most of it is removed by selective oxidation or by conversion in a low-temperature shift converter. However, there are still trace amounts emitted. Back to List Particulate Material Particulate material refers to any solid or liquid particles in the air, including dust, soot, and smoke.
Most particles are too small to be seen, but they contribute to haze in both urban and rural areas.
However, it is a greenhouse gas, which helps to trap heat from the sun, so it is a concern when evaluating emissions. In a methanol-fueled fuel cell, CO 2 is produced during the reforming process. In fact, a fuel cell that is fed pure hydrogen will only have water vapor as an emission. This graph depicts representative emissions of internal combustion vehicles using various fuels as compared to the established 1998 EPA Standards for transit buses. Fuel cell data is based upon vendor projections derived from stationary fuel cell power plant experience.