CuAPO-5 as a Multiphase Catalyst for Synthesis of Verbenone from α-Pinene

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Abstract
Copper(II)-containing aluminum phosphate material (CuAPO-5) was synthesized hydrothermally and used as a multiphase catalyst for the oxidation of α-pinene to verbenone. The catalysts were analyzed using X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area techniques, X-ray photoelectron spectroscopy (XPS), and ammonia temperature programmed reduction (NH3-TPD). Scanning electron microscopy (SEM), X-ray energy spectrometry (EDS), inductively coupled plasma emission spectroscopy (ICP-OES), Fourier infrared spectroscopy (FT-IR), and ultraviolet-visible spectroscopy (UV-vis) were performed to characterize the material. The effects of reaction temperature, reaction time, n(α-pinene)/n(TBHP), and solvent on the catalytic performance of CuAPO-5 were investigated. The results show that all the prepared catalysts have AFI topology and a large specific surface area. Copper is evenly distributed in the skeleton in a bivalent form. The introduction of copper increases the acid content of the catalyst. Under the optimized reaction conditions, 96.8% conversion of α-pinene and 46.4% selectivity to verbenone were achieved by CuAPO-5(0.06) molecular sieve within a reaction time of 12 h. CuAPO-5(0.06) can be recycled for five cycles without losing the conversion of α-pinene and the selectivity to verbenone.
Funding Information
  • National Natural Science Foundation of China (21502027, 2015GXNSFAA139041, XBZ130010, 2021Z005)
  • Natural Science Foundation of Guangxi Province (21502027, 2015GXNSFAA139041, XBZ130010, 2021Z005)
  • Scientific Research Foundation of Guangxi University (21502027, 2015GXNSFAA139041, XBZ130010, 2021Z005)
  • the Dean Project of Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology (21502027, 2015GXNSFAA139041, XBZ130010, 2021Z005)

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