MoVTeNbO_x催化剂焙烧条件对丙烷氧化制丙烯酸的影响

制备了Mo1V0.25Te0.13Nb0.12Ox催化剂，研究了焙烧条件（焙烧方式、焙烧气氛和焙烧温度）对该催化剂在丙烷选择氧化制丙烯酸反应中的影响。结果表明，两段间歇式焙烧要优于一段式连续焙烧所得催化剂的催化效果，适宜的预焙烧温度既有利于脱除挥发性物质和化学结合水，又能避免活性组分氧化生成不利的晶相；在惰性气氛中焙烧所得催化剂的催化效果要优于在弱氧化性气氛中焙烧，丙烷转化率和丙烯酸收率随着焙烧温度的升高先增加后减小，在600 ℃时达到最大值。

Research progress of MoVTeNbO_x catalysts in selective oxidation of propane

Mo1V0.25Te0.13Nb0.12Ox catalyst was prepared,and the effect of calcination conditions(calcination mode,calcination atmosphere and calcination temperature) of the catalysts on propane oxidation to acrylic acid reaction was studied.Results suggest that two-period intermittent calcination is superior to continuous calcination as the resulting catalyst has a better catalytic effect.Suitable pre-calcination temperature is conducive to the removal of volatile substances and the chemical combined water,and it is also conducive to avoid the transition of active component into unfavorable phase by oxidation.Calcination in inert atmosphere is better than that in a weak oxidizing atmosphere as the catalyst has a better catalytic effect.The propane conversion and acrylic acid yield increase with the calcination temperature at first but decrease while the temperature increases further,which have maximum values at 600 ℃.