Studies on Carbon Deposition on Hexaaluminate LaNiAl11O19 Catalysts during CO2 Reforming of Methane

The amount of carbon deposited on hexaaluminate LaNiAl₁₁O₁₉ catalyst in CH₄ decomposition and CO₂ reforming of methane was determined by means of thermogravimetric analysis (TGA). The properties of carbon formed on the catalysts were characterized by X-ray photoelectron spectroscopy (XPS), temperature-programmed CO₂ reaction (TPR-CO₂), and temperature-programmed oxidation (TPO) techniques. The experimental results showed that hexaaluminate LaNiAl₁₁O₁₉ catalyst possessed high resistance to carbon deposition in CO₂ reforming of methane to synthesis gas at high temperatures, and CO₂ played an important role in eliminating carbon during the reaction. At least two forms of the deposited carbon, graphite and carbide, were produced during methane reforming with CO₂.