The　kinetics　of　n-butane　conversion　over　HZSM-5　zeolites　at　low　temperature　were　studied.　The　results　show　that　n-butane　conversion　mainly　occurs　via　monomolecular　pathway　under　low　n-butane　pressure　(＜0.1　bar),　while　quickly　transforms　to　bimolecular　pathway　with　the　increase　of　n-butane　pressure.　This　can　be　explained　by　the　lower　apparent　activation　energy　of　bimolecular　reaction　compared　with　the　monomolecular　one.　With　the　increase　of　n-butane　pressure,　the　reaction　orders　for　the　formation　of　bimolecular　products　with　respect　to　the　n-butane　pressure　decrease　from　2.0　to　1.0,　which　is　caused　by　the　change　in　the　kinetic　regime　in　which　the　kinetic　parameters　are　being　measured.　Upon　an　increase　in　pressure,　the　Brønsted　acid　sites　go　from　low　coverage　to　high　coverage.　At　low　coverage　of　n-butane,　the　initial　point　for　the　measurement　of　apparent　activation　energies　is　the　gas　phase　of　the　hydrocarbon　and　the　highest　point　in　energy　is　butyl　carbonium　ions.　While　at　full　coverage,　the　initial　point　is　the　carbenium　ions　and　the　highest　point　is　the　hydride　transfer　reaction,　which　follows　a　first　order　kinetic　rate　law　with　respect　to　the　n-butane　pressure.　©　2019　Elsevier　B.V.