【摘要】 <正> 由于氧化脱氢比脱氢有着不可比拟的优越性,所以氧化脱氢过程的催化剂研究受到重视.用复合氧化物作催化剂,以丁烯为原料生产合成橡胶和塑料的单体丁二烯已用于更多还原

【Abstract】 The kinetics of the oxidative dehydrogenation of 2-butene to butadiene over a ferrite catalyst was investigated by the use of continuous flow recirculation method. The experiments have been carried out at temperatures of 300,320,340,360,380,400 and 420℃ and under total pressure of ~0.830 atm, in which the partial pressures of 2-butene, oxygen and nitrogen are 2.0 ×10~3~2.5×10-2,5.0×10-3~-4.0×10-2 and 9.5×10~2~1.0X 10-1 atm respectively, while the pressure of water is 0.69 atm. Several exponential rate expressions were obtained by using a non-linear, least-squares, computer curve-fitting technique. The rate of formation of butadiene follows half-order kinetics only with respect to 2-butene. The rate of formation of carbon dioxide, however, follows zero-order kinetics with respect to 2-butene and oxygen. It is noted that there are two kinds of active sites on the surface of the catalyst, one of them is for the oxidative dehydrogenation of 2-butene to butadiene, the other is for the combustion reaction. Furthermore, there is a compensation effect in this catalytic system.更多还原