Improvement of lifetime of Ni/mordenite catalysts for CO₂ reforming of methane by support modifi cation with alumina and Co-K loading

Ni/H-mordenite catalyst was modified to enhance the lifetime of catalysts for CO₂ reforming of methane. The unmodified catalyst was deactivated due to collapse of the zeolite structure at 1173 K, and the catalyst activity was reduced by carbon deposition at 923-973 K. Two methods of modification were evaluated to suppress deactivation of the catalyst, i.e., surface modification of the mordenite support with alumina or titania, which resulted in no deactivation at 1173 K, and Co-loading of Ni with Co and/or K, which resulted in suppression of the catalyst deactivation by carbon deposition at 973 K. A new catalyst with longer lifetime, Ni-Co-K/HM-Al₂O₃, was prepared with activity maintained for > 300 hr at 973 K.