The coproduction of H-2 during coking of petroleum residues was attracting attention, although it. has not approached a near commercial stage. The sintering of catalysts, with a limited number of utilization cycles, was a drawback of the method. The features of pilot plants used for testing resembled those of Exxon's fluid/ flexi-coking process. It was proposed that after some modifications, a high concentration H-2 may be produced employing the latter process. Little modifications would be necessary in the case that Fe oxides used as catalysts were replaced by catalysts in which active metals (e.g., Fe, Ni, V, Co, etc.) are deposited on carbon particles whose properties approach those of the fluid/flexi coke. The thermodynamic analysis indicating the viability of such process was presented. This is supported by limited experimental data.