Fig. 4. The m /z 28 traces during analysis of (A)
Qz and (B) SWy-1 with different F/O ratio. Red arrows represent the
positions of CO peak ends.
The reactivity was improved by increasing the F/O ratio, suggesting that
the fluorination of the silicate minerals in the reactor was not
stoichiometric. If the reactivity is further improved, fluorination can
be achieved, even with an F/O ratio of 2. Therefore, since it was found
that replacing graphite with Ni/C could improve the reactivity (Run1),
we tested whether the reactivity could be increased by adopting a recipe
with Ni/C and NaF at a lower F/O ratio (Fig. 5). The peak end positions
for the samples with NaF at F/O = 2 and 6 were not significantly
different from those of the samples with NaF at F/O = 6 and graphite,
suggesting that Ni/C could cause an efficient and fast reaction, even at
low F/O ratios.