p-メトキシトルエンの気相接触酸化によるp-アニスアルデヒドの合成

The vapor phase oxidation of p-methoxytoluene to p-anisaldehyde has been studied. A V205-P205 catalyst scarecely exhibited an activity to give p-anisaldehyde. The activity of the catalyst was improved and continued for a long time by appropriate addition of CuO. However, the addition of CuO led to the increase of combustion products, and resulted in a drop in the selectivity to p-anisaldehyde. The addition of K2SO4 to V205-P205-CuO catalyst decreased combustion products and improved the selectivity.