摘要
利用浸渍法制备的V-Ti-O催化剂催化氧化4-甲基吡啶一步合成了异烟酸。对催化剂进行了XRD表征,并采用液相色谱、红外等手段分析异烟酸产品。考察了V负载量、助剂、反应温度、空速以及进水量对催化剂性能的影响。结果表明:酸性氧化物助剂利于提高催化性能,碱性氧化物则会抑制催化活性。V/Ti(原子比)、反应温度和进水量对异烟酸产率有显著影响。在V-Ti-Cr-Al-P催化剂上,当V/Ti为0.21,反应温度310℃,4-甲基吡啶液体积空速小于0.3h?1,空气/水/4-甲基吡啶(摩尔比)为96/70/1时,异烟酸的产率可以达到82%。
Isonicotinic acid was directly synthesized by vapor-phase oxidation of 4-picoline over V-Ti-O catalysts prepared by impregnation method. Characterization of the catalysts prepared was carried out by using XRD and the products of the reaction were analyzed by LC and IR. The effects of V loading, promoter, reaction temperature, the space velocity and water quantity on the catalytic performance were investigated. It was found that acidic oxide promoter can improve the catalytic performance and alkaline oxide restrains the activity contrarily. Moreover, the v/Ti （atom ratio）, reaction temperature and water feeding rate could affect the yield of isonicotinic acid remarkedly. The highest yield （〉82%） was obtained by the V-Ti-Cr-Al-P catalyst, The optimum conditions are as follows： V/Ti of 0.21, reaction temperature of 310℃, the volume space velocity of liquid 4-picoline lower than 0.30 h^-1 and air/water/4-picoline （mole ratio） of 96/70/1.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2007年第3期448-453,共6页
Journal of Chemical Engineering of Chinese Universities
