The　catalysts　γ-alumina　(GA,　the　reference　catalyst)　and　Pt　doped　γ-alumina　(PGA-s)　were　synthesized　using　a　simple　sol-gel　technique,　in　which　at　first　preparation　of　porous　base　(GA),　then　impregnation　of　platinum　salt　over　the　base　and　finally　reduction　of　platinum　in　the　surface　of　the　support　were　done.　These　catalysts　prepared　in　different　mole　ratios　of　Pt:Al　as　2:1,　1:1　and　1:2　are　named　as　PGA-1,　PGA-2　and　PGA-3　respectively.　The　isomerization　of　n-alkanes　(n-hexane,　n-heptane　and　n-octane)　were　investigated　over　the　synthesized　catalysts.　The　2-methyl　pentane　(2-MP),　2,2-dimethyl　pentane　(2,2-DMP)　and　2,3-dimethyl　hexane　(2,3-DMH)　are　the　major　products　of　respective　isomerization　of　n-hexane,　n-heptane　and　n-octane,　besides　a　small　amount　of　other　branched　isomers　are　also　produced.　The　product　distribution　is　comparable　to　that　reported　for　Pt　based　other　catalysts.　The　optimal　mole　ratios　of　Pt:Al　is　1:1　(PGA-2)　gives　quite　good　catalytic　activity　for　isomerization　of　n-alkane.　Even　through　in　reusability　study,　PGA-2　gives　better　performance　than　others.　We　have　mainly　focused　on　kinetic　study,　reaction　mechanism　behind　isomerization　and　calculated　the　order　of　reactions　and　activation　energies　of　the　isomerization　reactions　in　the　present　work.　©　2017　Southwest　Petroleum　University