LIQUEFIED PETROLEUM GAS FOR LP GAS FUEL CELL, METHOD OF DESULFURIZING THE SAME AND FUEL CELL SYSTEM

A petroleum gas fuel for LP gas fuel cell to be fed to a fuel cell system according to a natural vaporization supply method, wherein the content of C2 hydrocarbon compounds is 3 vol.% or less, the content of C4 hydrocarbon compounds 3 vol.% or less, the total sulfur concentration 10 mass ppm or less, the concentration of sulfur of carbonyl sulfide 2 mass ppm or less, the concentration of sulfur of methylmercaptan 3 mass ppm or less, the concentration of sulfur of sulfur compounds whose boiling point is equal to or higher than that of dimethyl disulfide 2 mass ppm or less, the methanol concentration 50 mass ppm or less, the water concentration 50 mass ppm or less and the balance constituted of C3 hydrocarbon compounds. In the petroleum gas fuel for LP gas fuel cell, desulfurizing agents even when added in a minimum amount, efficiently function to thereby attain an enhancement of desulfurization effect and prevent damaging of a reforming catalyst lying in a reformer for hydrogen production disposed downstream of a desulfurizer. Thus, the petroleum gas fuel for LP gas fuel cell realizes stable driving of the reformer and stable electric power generation. Further, there is provided a method of desulfurizing the petroleum gas fuel, and provided a fuel cell system wherein use is made of a hydrogen-containing gas obtained by reforming of liquefied petroleum gas fuel having been desulfurized by the use of this desulfurization method.