【摘要】 用脉冲法研究了己烷各异构体在自制M₂₃型催化剂上的反应机理和动力学。结果表明,己烷各异构体在该催化剂上的反应活性次序为3MP～ZMP～2,3DMB>nH>2,2DMB。建立了己烷异构化反应的三族反应网络,并Wei-Prater方法求得了该反应网络中各步反应的相对反应速度常数和表观活化能。更多还原

【Abstract】 The pulse micro-catalytic reactor has been extensively used in catalytic research work to evaluate catalysts and to study reaction mechanism. The present investigation is concerned with an application of the micro-catalytic pulse technique to study the reaction mechanism and kinetics of the isomerization of hexanes. The reaction conditions were: catalyst particle diameter 0.24-0.45mm, 0.1g catalyst, 0.4μl input pulse reactant, 4.9×105 Pa total pressure, carrier gas (hydrogen) velocity: 1.0 -18.6 1/hr and temperature 260-300℃. The products were analyzed by gas chromatography with a OV101 capillary column.The results on isomerization of five hexane isomers show that their isomerization activities on M23 catalyst, which was made by ourselves, are in the following order: 3MP-2MP-2, 3DMB >nH>2,2DMB. The product distributions of individual isomers reveal evidence for the occurrence of a direct interconversion between nH and 2,2DMB. These results imply that the M23 catalyst keeps the catalytic properties of H-Mordenite.For the reaction scheme (see p. 334) proposed, the rate constants have been evaluated by Wei-Prater method at temperature 260-300℃. As the rates of the various pure species in the B system, which is the characteristic coordinate system of the reaction network, are given by a set of simple completely uncoupled differential equations, its kinetics can be studied by the pulse method. Activation energy data for the isomerization of hexane isomers are summarized in Table 2 (see p. 337).更多还原