Mercury Speciation Transformation During Coal Combustion - Mercury Emission and its Control in Chinese Coal-Fired Power Plants - page 44

d C

(4-20)

Hg

kC

1 g

d t

where

(4-21)

kkC

1 HCl

Natural logarithms were substituted on both sides, and the following formula was
derived:

d C

(4-22)

Hg

ln ln k ln C

1 Hg

d t

d C

Thus, a straight line could be drawn from to ln C Hg . And α could

Hg

ln

d t

thus be obtained from the slope of the line. Also, k 1 could be obtained from the
linear intercept. In order to obtain the dependence of the reaction rate on HCl,
natural logarithms were substituted on both sides of Eq. (4-21) as follows:

(4-23)

ln k ln k ln C

1 HCl

During the experiment, with excessive HCl concentration, it was changed to
obtain the values of k 1 ~ C HCl . A line could be drawn from ln k 1 to ln C HCl . Then, β
could be obtained from the slope, and k could be obtained from the linear intercept.
This approach was shown in the literature.
The overall reaction rate constant could be expressed using the Arrhenius for-
mula as follows:

(4-24)

kA exp( ERT / )

a

where E a is the energy activation; A is the preexponential factor; R is the gas con-
stant; and T is the gas temperature.
Natural logarithms were substituted on both sides and the following expression
was derived:

E

1

(4-25)

ln k ln A RT

A line could be drawn from ln k to 1/ T to obtain the energy activation E a and the
pre-exponential factor A of the adsorption reaction.