Hydrogen evolution in the dehydrogenation of methylcyclohexane over Pt/Ce Mg Al O catalysts derived from their layered double hydroxides

Abstract Pt/Ce Mg Al layered double hydroxides with different Ce contents were prepared by one-step co-precipitation method, which underwent calcination and reduction with hydrogen and were finally converted into Pt/Ce Mg Al O catalysts. These catalysts were tested in the dehydrogenation of methylcyclohexane (MCH) into toluene to produce hydrogen. The addition of CeO 2 promoted the dispersion of Pt and decreased the Pt particle size. During the dehydrogenation reaction, toluene was the only liquid product and its selectivity was higher than 99.9%. MCH conversion increased with the reaction temperature rising. The conversion and hydrogen evolution rate on Pt/Ce 14 Mg Al O 350 reached up to 98.5% and 1358.6 mmol/g Pt /min at 350 °C. Moreover, Pt/Ce Mg Al O catalysts exhibited no acidity and presented a high anti-coking ability and good stability. These results suggest that Pt/Ce Mg Al O catalysts have potential industrial application for hydrogen energy utilization.