Selective catalytic reduction of NO with methane on γ-Ga2O3-Al2O3 solid solutions prepared by the glycothermal method

The γ-Ga2O3-Al2O3 solid solutions prepared by the glycothermal reaction of the mixtures of aluminum isopropoxide and gallium acetylacetonate had extremely high activities for selective catalytic reduction of NO with methane as a reducing agent (CH4-SCR). With the increase in the Al content incorporated in the spinel structure, the catalytic activity increased. The active sites for this reaction were concluded to be the tetrahedral Ga ions with octahedral Al ions in the next-nearest-neighbor sites. Methane activation on the catalysts was the key-step of CH4-SCR. The solid-solution catalysts showed high durability under steaming conditions.