The results indicated that amorphous MoO3 with high dispersion was favorable for the production of DPO. However,the formation of a great amount of the crystal MoO3 resulted in the decrease of catalytic activity.

• 结果表明,呈高度分散的无定型MoO3有利于该反应的进行,而大量晶态MoO3的出现导致了催化活性的降低。