The cracking of butene and pentene is an effective route for MTO process to sufficiently utilize these olefin byproducts. Butene and pentene can be efficiently converted to propylene and ethylene over HZSM-5 catalyst modified by Fe and P. In the coupling cracking of butene and pentene, butene mainly cracked through bimolecular pathway, while pentene cracked via both monomolecular and bimolecular pathways. Moreover, propylene was an intermediate product and might involve other type reactions besides cracking. Based on the effect of operating conditions, a six-lump (butene, pentene, propylene, ethylene, C_1-5 alkanes and C₆₊ hydrocarbons) kinetic model is proposed for the coupling cracking of butene and pentene. Different cracking mechanisms were taken into account, and different reaction orders were obtained for reaction steps in the kinetic model. The experimental data were measured in an isothermal fixed-bed reactor under a wide range of operating conditions (at 490–610 °C; space time of 0.93–4.67 (g of catalyst) h (mol CH₂)⁻¹; steam ratio of 0.18–0.9 (g of steam) (g of feed)⁻¹ range), and the kinetic parameters were estimated through Levenberg-Marquardt algorithm. A good parity between calculated and experimental data was attained, indicating the applicability of the model to quantify the distribution of product lumps.

丁烯和戊烯的裂解是MTO工艺充分利用这些烯烃副产物的有效途径。丁烯和戊烯可以通过Fe和P改性的HZSM-5催化剂有效地转化为丙烯和乙烯。在丁烯和戊烯的偶合裂解中，丁烯主要通过双分子途径裂解，而戊烯则通过单分子和双分子途径裂解。此外，丙烯是中间产物，除裂化外还可能涉及其他类型的反应。根据操作条件的影响，六块状（丁烯，戊烯，丙烯，乙烯，C _1-5烷烃和C ₆₊提出了丁烯和戊烯偶合裂解的动力学模型。考虑了不同的裂解机理，并在动力学模型中为反应步骤获得了不同的反应顺序。在等温固定床反应器中，在较宽的操作条件下（490–610°C； 0.93–4.67（催化剂的克数）h（mol CH ₂）^-1；时空比）的时空条件下测量了实验数据。 0.18-0.9（克蒸汽）（克饲料）^-1范围），动力学参数通过Levenberg-Marquardt算法估算。在计算数据和实验数据之间获得了很好的均等性，表明该模型可用于量化产品块的分布。