Abstract：The hydrogenation of p-phenylphenol is a consecutive and parallel complex reaction. Owing to the difference in the hydrogenation ability of the two benzene rings in p-phenylphenol, the hydrogenation products contained several structural isomers, which can not be identified by normal analytical method. However, the reaction mixture was effectively separated and identified by GC-FTIR technique. According to the characteristic wave numbers of benzene ring substituted at different positions, the main product was confirmed to be p-cyclohexylphenol, and the two typical by-products were p-phenylcyclohexanol and p-cyclohexylcyclohexanol, respectively. Each product has several stereo-isomers. GC-MS，melting point measurement and NMR proved the accuracy of GC-FTIR results, indicating that GC-IR is an useful and rapid method for analyzing structural isomers of organic compounds.
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