V2O5催化甲醇与乙醇合成异丁醛

研究了甲醇与乙醇在V2O5催化剂上，常压375℃下一步催化合成异丁醛的反应，考察了催化剂活性组分质量分数和制备条件对催化剂催化性能的影响。结果表明，催化剂中V2O5质量分数为75%，焙烧温度480℃、焙烧5h时，催化剂的催化性能较其他条件更佳，乙醇转化率达98.03%，异丁醛的选择性达47.52%。对新鲜催化剂、反应后和再生后催化剂进行了XRD测试，并对反应后催化剂进行了DTA TG测试。结果表明，催化剂在反应过程中有结焦且V2O5在反应过程中被还原为V2O3。通过高温烧炭再生可烧去结焦物，并将V2O3重新氧化为V2O5而使失活催化剂恢复其催化活性。

V2O5 catalyst for synthesis of isobutyraldehyde from methanol and ethanol

The synthesis of isobutyraldehyde from methanol and ethanol was investigated over vanadium catalysts at 375℃ and under normal atmospheric pressure. The influence of V2O5 content and preparation conditions of catalysts on catalytic performances was studied. The results showed that 75% V2O5 content, 480℃ calcination temperature and 2h calcination time were the optimum conditions, and the ethanol conversion and isobutyraldehyde selectivity reached to 98.03% and 47.52% respectively. The fresh, reacted and regenerated catalysts were investigated by XRD and the reacted catalyst was also tested by DTA TG to establish change of vanadium oxide. The results showed that V2O5 was reduced to V2O3 during reaction and deactivated catalyst could be regenerated.