Question

Performance of hydrogen gas as a fuel in s i engines

Answer 1

The hydrogen operated SI engines was found profitable in terms of both thermal efficiency and nitrogen oxides emissions. ... For gasoline operated engine maximum NOX occurs at 2200 rpm due to occurrence of high temperatures while for hydrogen operated engine NOx occurs at 1800 rpm.

Answer 2

Hydrogen has been proven to be as safe as or even safer than other flammable fuels such as gasoline or natural gas. However, hydrogengas has a few unique properties that require special consideration. For example, hydrogencan leak easily and ignite a relatively low temperature.
List of Disadvantages of Hydrogen Fuel Cells. Critics of hydrogen fuel cells argue that although these cells do not emit carbon after burning, they give out nitrogen dioxide and other emissions. Nitrogen dioxide is a toxic gas and can still be harmful when ingested by humans.