While the broadness of the pyrolysis profile of most kerogens is
described well by a parallel
reaction model, the pyrolysis profile at a constant heating rate for
certain well-preserved algal
kerogens is narrower than can be described by a single first-order
reaction. Further, these
kerogens show an acceleratory period under isothermal conditions that
is inconsistent with any
parallel or nth-order reaction model. Three different
models (serial, Bouster, and three-parameter)
are tested against isothermal and nonisothermal pyrolysis data for a
few samples, with the
conclusion that the three-parameter model fits well and is the most
stable and reliable. The
three-parameter model reduces to a first-order model when the
acceleration parameter is zero.
The overall activation energy and frequency factor from this model
are very close to those of the
T
max-shift method recommended
earlier.
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