In this paper, a waste fluid catalytic cracking (FCC) catalyst is used as a carrier to prepare a supported non-noble metal nickel catalyst (Ni/wFCC), which is applied to the selective hydrogenation of citral to citronellal. X-ray powder diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy were used to analyze the structural characteristics of the Ni-loaded sample. The catalyst after loading Ni still maintained a good zeolite structure, and the surface impurities were reduced. The effect of reaction conditions on the Ni/wFCC-catalyzed hydrogenation of citral to citronellal was investigated, and the optimal reaction conditions were obtained as follows: a Ni loading of 20 wt %, a catalyst amount of 5.6%, a hydrogenation temperature of 180 °C, a hydrogenation time of 90 min, and a hydrogenation pressure of 3.0 MPa. Under these conditions, the conversion of citral and selectivity of citronellal were 98.5 and 86.6%, respectively, indicating that the Ni/wFCC catalyst had strong catalytic activity and selectivity. This research provided new ideas for the recycling of waste FCC catalysts and industrial synthesis of citronellal.

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Fluorescent polyurethanes (FPU) have been widely used in coatings, temperature recognition, fluorescent probes, and other fields because of their diverse structures and properties. Unfortunately, most FPUs are currently produced from petroleum-based products. Herein, a thermoplastic rosin-based naphthalene FPU was prepared by using the biobased ester of acrylic rosin and glycidyl methacrylate, polycaprolactone, 1, 5-dihydroxy naphthalene (1, 5-DN) and isophorone diisocyanate as the raw materials. The structure of FPU was confirmed by proton nuclear magnetic resonance (1H NMR) and Fourier transform infrared spectroscopy (FTIR). In addition, thermal performance analysis (TGA, DSC) and water contact angle analysis (WCA) showed that the addition of 1, 5-DN improved the thermal stability and hydrophobicity of FPU. More importantly, FPU exhibited good fluorescence performance in both liquid and solid states, and the fluorescence intensity increased with increasing temperature. Both aniline and trichloromethane showed effective fluorescence quenching for FPU. Therefore, FPU is a promising material for applications in temperature recognition and fluorescence probes.