Abstract: Carbon deposition and catalyst deactivation of a Sb-Fe oxide catalyst for ammoxidation of propylene were investigated by means of a fluidized-bed reactor charged with 10 ml catalyst. The reactivity, surface acidity, specific surface area, average pore radius and ESR spectrum data were obtained with the catalysts of increasing carbon deposition. Chemisorption of oxygen and propylene and TPD (thermal programmed desorption) of propylene were carried out on the commercial Mo-Bi and Sb-Fe oxide catalysts. Isotopic experiment using acrylonitrile-2-14C as tracer was also carried out. The following results were obtained. 1 ) Carbon deposition due to intermediates and acrylonitrile on selective oxidation sites could be the primary reason for catalyst deactivation;2 ) Sb-Fe oxide catalyst has a property of easy reduction and difficult reoxidation, so that the active catalyst structure-FeSbO4 would be decomposed under oxygen-poor condition into Sb2O3 and 2-Fe2O3 which forms the deep oxidation catalyst component. A suggestion for improving catalyst properties has been proposed from these results.

摘要： 在装有10ml催化剂的沸腾床反应器中研究了丙烯氨氧化Sb-Fe催化剂的结炭过程和结炭的影响,通过对Sb-Fe催化剂和国外工业化的催化剂的反应性能、表面酸度、表面积、平均孔径、ESR和丙烯与氧的化学吸附及丙烯的TPD等物理化学测定以及丙烯腈-2-~（14）C的同位素实验,证明了反应物及中间物在选择氧化的活性中心上的结炭是催化剂失活的主要原因,并且Sb-Fe氧化物催化剂具有易还原和不易再氧化的性质,在低氧气氛中易于引起活性结构的破坏。根据以上的结论提出了改进催化剂的方向。