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carbonaceous fuels. This concept is practical in high-temperature fuel cells where the steam reforming reaction36 can be sustained with catalysts. By closely coupling the reforming reaction and the electrochemical oxidation reaction within the fuel cell, the concept of the internal reforming MCFC is realized. The internal reforming MCFC eliminates the need for the external fuel processor. It was recognized early that the internal reforming MCFC approach provides a highly efficient, simple, reliable, and cost effective alternative to the conventional MCFC system (89). Development to date in the U.S. and Japan continues to support this expectation (85, 90). There are two alternate approaches to internal reforming molten carbonate cells: indirect internal reforming (IIR) and direct internal reforming (DIR). In the first approach, the reformer section is separate, but adjacent to the fuel cell anode. This cell takes advantage of the close-coupled thermal benefit where the exothermic heat of the cell reaction can be used for the endothermic reforming reaction. Another advantage is that the reformer and the cell environments do not have a direct physical effect on each other. A disadvantage is that the conversion of methane to hydrogen is not promoted as well as in the direct approach. In the DIR cell, hydrogen consumption reduces its partial pressure, thus driving the methane reforming reaction, Equation (6-34), to the right. Figure 6-12 depicts one developer's approach where IIR and DIR have been combined. Figure 6-12 IIR/DIR Operating Concept, Molten Carbonate Fuel Cell Design (29) 36. Steam reforming of CH4 is typically performed at 750 to 900 °C; thus, at the lower operating temperature of MCFCs, a high activity catalyst is required. Methanol is also a suitable fuel for internal reforming. It does not require an additional catalyst because the Ni-based anode is sufficiently active. 6-31PDF Image | Fuel Cell Handbook (Seventh Edition)
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