Supported H4SiW12O40 catalysts for α-pinene isomerization
Kinetic curves for three recovery/reutilization cycles
and the effect of the SiW leaching for H4SiW12O40/TiO2
catalyst (α-pinene/catalyst ratio of 100/1, at 130°C).
Figure 11. Kinetic curves for three recovery/reutilization cycles and Figure 12.
the effect of the SiW leaching for H4SiW12O40/HZSM-5
catalyst (α-pinene/catalyst ratio of 100/1, at 160°C).
4. Conclusion
HZSM-5 was studied. The effect of reaction temperature
and catalyst concentration in the isomerization process
Isomerization of α-pinene in the presence of the solid was also determined. We succeeded in the optimization
acidic catalysts became an important methodology of an efficient synthetic route to obtain simultaneously
in industry since camphene and limonene, essential camphene and limonene. No leaching effect could be
intermediates in organic chemistry, were obtained. observed with respect to all the three studied catalysts.
A simple, clean and economic methodology for the From the recovery/reuse cycles, one may conclude
preparation of supported catalysts was developed. The that catalysts 4 and 6 are stable under used reaction
XRDstudiesindicatedthatSiWwascompletelydispersed conditions. The isomerization method presented
on the supports. Here, the isomerization of α-pinene in here offers also advantages such as high yields and
heterogeneous catalysis using catalysts prepared from simple procedures for synthesis, recovery and reuse of
H4SiW12O40 (SiW) supported on different oxides and catalysts.
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