Addition of zirconia in Ni/SiO 2 catalyst for improvement of steam resistance

Abstract

Nickel catalysts supported on silica–zirconia mixed oxides were prepared by homogeneous precipitation in sol–gel-derived wet silica gel. Their structural properties and catalytic performance in steam-reforming of methane were investigated from the viewpoint of steam resistance. Ni/SiO 2 without zirconia readily loses its catalytic activity during the reaction because the coarsening of silica that occurs in the presence of high-temperature steam hinders the active surface of Ni. The addition of zirconia drastically increases the steam resistance of silica. Ni/SiO 2-ZrO 2 catalyst shows steady activity in steam-reforming of methane without any changes in pore structure.