从氯盐体系制备丙烯氨氧化用催化剂(Ⅱ) ———含铋催化剂的活性评价

来源期刊：中南大学学报(自然科学版)2001年第4期

论文作者：金胜明 唐谟堂 阳卫军

文章页码：367 - 370

关键词：含Bi催化剂;丙烯;氨氧化

Key words：Bi-containing catalyst; propylene; ammoxidation

摘    要：评价了从氯盐体系中制备海泡石等载体负载的含铋催化剂对丙烯氨氧化反应的催化活性;考察了催化剂中氯含量、温度、催化剂的孔径分布、载体对催化活性和空速对反应的影响.研究结果表明,氯含量小于4×10^-5时对丙烯氨氧化反应的影响小,高于4×10^-4时可导致催化剂失活;硅胶、海泡石、氧化铝3种载体的催化活性顺序为:海泡石≈硅胶>氧化铝.当V_丙烯∶V_氨∶V_空气=1·00∶1.05∶11·00,空速为3 000 cm³·g^-1·h^-1,温度530℃左右,催化剂孔径分布为40~100 nm时,催化剂的活性最强,其丙烯转化率为98.5%,丙烯腈的选择性达81.7%.

Abstract: Catalytic activity rating of sepiolite supported catalyst from the chlorination salt systems was determined in selfmade fixed bed reactor. The effects of chloride content, temperature, distribution of porous of catalyst, support and space velocity of the feed gas on catalytic activity were detected. The results show that sepiolite supported catalysts have good performance for propylene ammoxidation since w(Cl)<4×10^-5and the catalytic activity is lost after w(Cl)>4× 10^-4. Supporters of catalyst have effect on catalytic activity markedly and its activity decreases with the different supporter in the following order∶sepiolite≈silicagel>alumina. Propylene was obtained at 98.5% conversion and 81.7% selectivity of acrylonitrile in the conditions of V _propylene∶V_NH3∶V_air=1∶1.05∶11, space velocity 3 000 cm³·g^-1·h^-1, 530℃ and 40~100 nm porous distribution of catalyst.