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A kinetic model of eight lumps (methane, ethylene, propylene, C 2−3 paraffins, butanes, C 5+ hydrocarbons (aliphatic hydrocarbons of five or more carbon atoms), and aromatics (benzene, toluene, and xylenes, BTX)) has been established for the transformation of 1-butene over a 1 wt % K modified HZSM-5 zeolite (SiO 2 /Al 2 O 3 = 280) catalyst (of moderate acidity). The kinetic model allows quantifying product distribution at zero time on stream, and particularly propylene production, which has an increasing demand in petrochemical industry. The experimental data have been obtained in an isothermal fixed-bed reactor in the 400−600 °C range and under a wide range of experimental conditions: space time up to 1.6 (g catalyst h) (mol CH2 ) −1 and 1-butene partial pressure between 0.375 and 1.35 bar. It has been proven that a simplified kinetic model of five lumps (ethylene, propylene, butenes, C 1−4 paraffins and C 5+ hydrocarbons (aliphatics and aromatics)) is also suitable. Both models predict a product distribution that fits the experimental results in the range of operating conditions studied.