The article explores different ways to make hydrogen from coal, comparing three methods for efficiency: suspension gasification, fluidized-bed gasification, and fluidized steam-iron process. The study found that fluidized-bed gasification is the most efficient at 66.4%, followed by the fluidized steam-iron process at 62.6%. It also shows that turning coal into methane is more efficient and cheaper than turning it into hydrogen if some coal is first converted to synthesis gas.