THESIS
Kinetic Study of Catalytic Partial Oxidation of
Synthetic Diesel for Hydrogen Production
University of Regina
Faculty of Graduate Studies and Research, University of Regina
A Thesis Submitted to the Faculty of Graduate Studies and Research In Partial
Fulfillment of the Requirements for the Degree of Master of Applied Science in
Process Systems Engineering, University of Regina. xix, 152 p.
Khan, Md. Faysal Ahamed
Jan-2012
Master of Applied Science (MASc)
Faculty of Engineering and Applied Science
Engineering - Process Systems
Abstract:
The focus of this research is to study the
kinetics of the catalytic partial oxidation
(CPOX) of synthetic diesel (SD) for hydrogen production. The kinetic
experiments were done in a packed bed tubular reactor (PBTR) over a 5wt.%Ni/Ce0.5Zr0.33Ca0.085Y0.085
(5N/CZCaY) catalyst prepared by a surfactant-assisted route. The SD is composed
of 75 vol.% saturated hydrocarbons and
25 vol.% aromatic hydrocarbons, with an average
chemical formula resembling commercial diesel C12.87H24.81. The kinetic
experiments were conducted at
atmospheric pressure, in the temperature range of 1123-1223K (850- 950 degrees C), with oxygen/synthetic diesel
(O2/SD) ratio in the range of 6.7-10.5 and W/FSD,0 weight-time) in the range of
19008-47556 kgcatalyst*s/kmolSD. The experimental results were used to derive
an empirical power law rate model. This model was of the form: r'SD =
K0e(-E/RT)NmSDNn02
Activation energy was found to be 16kJ/mol and
the order of reaction with respect to SD was 1.89 (≈2) and with respect to
oxygen was found to be 0.41 (≈1/2). Estimation of the values of the model
parameters was based on the minimization of the sum of the residual squares of
the reaction rates by Gauss-Newton and
Levenberg-Marquardt algorithm using non-linear regression (NLREG)
software. Excellent agreement between
the experimental and predicted rate was established with an absolute average deviation (AAD) of 8%. The
5N/CZCaY catalyst was tested for an
extended time on stream (TOS) operation in order to establish and
demonstrate that the catalyst is stable
and also to ensure steady state performance. In addition, the effects of
reaction parameters such as reaction temperature, feed ratio (O2/SD), and
weight-time W/FSD,0) on the resultant catalytic activity of the chosen catalyst
were also investigated in order to obtain the optimal operating conditions for
H2 production from CPOX of SD. To the best of our knowledge, the current study
is the first of its kind on the CPOX reforming of SD.
Free Full Text Source: http://dspace.cc.uregina.ca:8080/dspace/handle/10294/3542
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