EFFECT OF THE COMPOSITION OF SUPPORTED COPPER-CONTAINING SALT
295
the unstable compound K2CuCl4, which decomposes Nevertheless, additional information is required in
order to confirm this conclusion.
into inert KCl and KCuCl3.
Thus, although the formation of the double salt
KCuCl3 in some cases facilitates the transfer of cop-
per-containing salts into the melt at lower tempera-
tures and increases their stability, in my opinion, it
simultaneously decreases the catalyst activity in the
reaction with increasing the K/Cu ratio. On this basis,
it can be argued that the curves shown in Fig. 3 were
obtained without taking into account a possible signif-
icant change in the stationary concentration of an
active copper species under the reaction conditions
with changes in the ratio between the salts in the cata-
lyst. To obtain plausible information on the effect of
the ratio between the chlorides on the catalyst activity,
it is necessary to maintain a constant concentration of
the active form of copper in such experiments. It is
obvious that corresponding adjustments are relevant
because they can fundamentally change the shape of
curves in Fig. 3. This problem can be solved only by
controlling the concentration of the active form of
copper in the catalysts (for example, based on the
known kinetics of formation of KCuCl3 under the
reaction conditions or by other methods). However,
rough estimates can be made by comparing the results
of experiments conducted on catalysts with signifi-
cantly different ratios between the components with
consideration for the easy interaction of copper and
potassium chlorides [29].
ACKNOWLEDGMENTS
I am grateful to R.N. Gur’yanova for her participa-
tion in this work and to A.G. Zyskin and N.V. Yaz-
vikova for their assistance in the preparation of this
manuscript.
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KINETICS AND CATALYSIS Vol. 60 No. 3 2019