摘要
采用MRGC-80型高压微反色谱联合装置,在400～470℃、3MPa下研究了文题。建立了数学模型,得到了反应速率常数和失活速率常数、反应级数和失活级数、反应和失活表观活化能。结果表明,催化剂失活为独立失活,失活级数随过程变化。从失活级数推测其失活机理为平行连串失活,反应物甲苯、产物苯和二甲苯均能引起催化剂失活。反应压力在一定范围内对催化剂失活速率无明显影响,故可在较低的反应压力下研究催化剂失活动力学。温度对催化剂失活速率的影响不大,表明在所用温度范围内提高反应温度,对甲苯歧化反应过程是有利的。
The title content was studied in a combined unit of MRGC-80 catalytic pressure microreactor connected to GC in the temperature range from 400℃ to 470℃ under hydrogen pressure of 3 MPa. The mathematical model of deactivation kinetics has been deduced. The reaction rate constant, the rate constant for the deactivation reaction, the order of reaction, the order of deactivation, and the apparent activation energies of reaction and deactivation have been obtained. The catalyst deactivation is a kind of independent deactivation; the order of deactivation varies with the course of reaction. From the order of deactivation, it is speculated that the deactivation mechanism is a parrallelseries deactivation. The catalyst deactivation may be caused both by the reactant toluene and the products benzene and xylene. Within a certain range of pressure and temperature, the rate of deactivation is not influenced by pressure and temperature. So the experiment can be made under lower pressure, and increasing the temperature is advantageous to the disproportionation of toluene.
关键词
甲苯
歧化反应
沸石
丝光沸石
失活
toluene
disproportionation
zeolite
reaction mechanism
deactivation kinetics
mordenite
