The formation of hydrogen, without CO or CO₂, through the decompn. of kerosene at 773-873 K was performed. Ni/TiO₂ catalyst showed the highest activity and the longest life among all the catalysts tested in the present study for the decompn. of a mixt. of tert-butylcyclohexane, n-dodecane, and diethylbenzene (denoted as kerosene). Benzothiophene, as an impurity added in kerosene, did not affect the catalytic performance of Ni/TiO₂ significantly for the hydrogen formation through the decompn. of kerosene. Therefore, the prodn. of hydrogen without CO or CO₂ from com. available kerosene, which contains impurity sulfur, could be realized. Supported nickel catalysts were deactivated rapidly during the decompn. of diethylbenzene, whereas hydrogen was formed efficiently through the decompn. of tert-butylcyclohexane and n-dodecane. The catalytic performance of supported nickel catalysts for the decompn. of diethylbenzene was improved by the addn. of Zn species. The addn. of Zn species decreased the av. crystallite size of nickel metal, which improved the catalytic performance for the decompn. of diethylbenzene. [on SciFinder(R)]