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

• Published in: Materials 2022-11, Vol.15 (22), p.8097
• Main Authors: Wang, Hongyun, Cheng, Haijun, Lai, Fang, Xiong, Deyuan
• Format: Article
• Language: English
• Subjects: Adsorption; Aluminum; Aluminum phosphate; Ammonia; Catalysts; Chemical synthesis; Conversion; Copper; Environmental impact; Inductively coupled plasma; Infrared spectroscopy; Molecular sieves; Multiphase; Nitrates; Oxidation; Photoelectrons; Pore size; Porous materials; Reaction time; Selectivity; Spectrum analysis; Surface area; Topology; X ray photoelectron spectroscopy; Zeolites
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma15228097

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 (NH -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.