The high catalytic activity of Ga_2O_3 was probably associated with an abundance of surface medium-strong acid sites related to the coordinatively unsatured Ga~3+ cations and the conjugated effect of proton and oxide.

• 催化剂的催化活性和其表面酸密度密切相关；在Ga2O3结构中；四配位Ga3+是其酸位的来源；并通过质子与氧化物的共同作用促进反应进行.