1967 Volume 9 Pages 7-12
The rate equation of cyclohexane disappearance in cyclohexane reforming reaction under high temperatures and high pressure conditions was determined with a reforming catalyst used in the petroleum naphtha reforming process.
The ranges of reaction conditions were as follows; the reaction temperature 400-470°C, the total pressure 35.0 atm, the liquid hourly space velocity 3-30hr-1, the mole ratio (m) of hydrogen to cyclohexane feed 5-15, and the initial hydrogen partial pressure (18.0-35.0)m/(1+m) atm. In this work, 0.3-0.7g of the catalyst was packed in a microreactor. Total hydrocarbon products were analyzed into their components, after being injected in their gas phase to the gaschromatograph.
The following conclusions were obtained from the present work:
(I) The rate of cyclohexane disappearance with the stabilized platinum type catalyst under the conditions mentioned above was expressed as to be proportional to cyclohexane partial pressure (pc), considering the reversive reaction (k'ppbp3h) of benzene to cyclohexane and the rate constant (k) was indicated by the following equation;
k=f0/V[1+3/(1+m)(1+p3h/K)]ln1/1-(1+p3h/K)x-f0/V3x/(1+m)(1+p3h/K), where x was the conversion of cyclohexane, t the reaction time, f0 the standard feed rate of total reactants, V the volume of the catalyst bed, ph the hydrogen partial pressure, K the equilibrium constant, and k the rate constant.
(II) The apparent activation energy (E) of the cyclohexane reforming reaction was 33.8kcal/mole.
(III) Therefore, the activity of reforming catalysts should be examined with the values of k and E.
