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以γ-Al_2O_3为载体,用浸渍法负载碱金属和碱土金属氧化物制备了一系列羰基硫水解催化剂。采用微反-色谱联用装置考察了45—100℃低温区内的活性变化规律。结果表明,催化剂活性与金属氧化物组分及含量有着密切关系。在考察各催化剂在不同温度下水解反应速度常数(K)的变化中,发现指前因子(A)与活化能(E)之间存在着补偿效应,活化能增大时指前因子也随之增大。补偿效应参数(K_0)和能量分布指前因子(1/b)均与负载的金属离子半径(d_m)有关。求得了各催化剂的等动力学温度(T),讨论了羰基硫水解反应中存在补偿效应的原因。
A series of carbonyl sulfide hydrolysis catalysts were prepared by impregnation of alkali metal and alkaline earth metal oxides with γ-Al 2 O 3 as carrier. Micro-reversed-chromatography unit was used to investigate the changes of activity in the low temperature range of 45-100 ℃. The results show that the catalytic activity and metal oxide composition and content are closely related. In examining the changes in the rate constant (K) of the hydrolysis reaction at different temperatures, it is found that there exists a compensatory effect between the pre-exponential factor (A) and the activation energy (E). As the activation energy increases, the pre-exponential factor Increase. Compensation effect parameters (K_0) and energy distribution before the factor (1 / b) are related to the metal ion radius (d_m) of the load. The isokinetic temperature (T) of each catalyst was calculated and the reason of the compensation effect in carbonyl sulfide hydrolysis was discussed.