Porous silica-carbon composites are obtained by mixing fine particulate carbon dispersed in water by a surfactant, alkali metal silicate aqueous solution, and mineral acid so as to produce co-dispersion in which silica hydrosol, produced by reaction of the...

A desulfurization system for a fuel cell of the invention includes a fuel supply unit that supplies a hydrocarbon fuel, which contains sulfur compounds, contains oxygen at a volume concentration of 1 ppm to 4%, and has a Wobbe index of 12 kWh/mto 16 kWh/m,...