Phase change materials (PCMs) offer efficient solutions for energy sustainability. Here, we used 1-decanol, expanded graphite (EG) with high thermal conductivity, and silica aerogel (SA), which is often used for thermal insulation protection, to prepare composite PCMs (EG-PCM and SA-PCM) with stable shape through the vacuum absorption method. The leakage rate test after heat treatment determined the optimum contents of EG and SA in the composite PCMs to be 9 and 14 wt.%, respectively. Even after 220 heating/cooling cycles, the fabricated composite PCMs still maintain good thermal stability. The thermal conductivity enhancement of EG-PCM and SA-PCM to 16.09 times and 1.21 times of the neat PCM, respectively. Moreover, we tested the prepared two composite PCMs by yogurt preservation experiments in a cold chain transport portable box, which proved that they could effectively maintain the temperature and acidity of yogurt for several hours without any cooling system. Based on these results, EG-PCM and SA-PCM have broad application prospects in cold chain transport of temperature-sensitive products such as food, medicine, and vaccine.
Yue Li,Huan Ren,Daolai Sun,Xinqiang Zhao,Satoshi Sato
Liquid-phase catalytic hydrodeoxygenation of 1,2-decanediol (1,2-DDO) to form 1-decanol was performed over various non-noble metal-loaded acidic catalysts, and Cu loaded on amorphous SiO 2 -Al 2 O 3 exhibited a high catalytic activity for the formation of 1-decanol. A high 1-decanol selectivity of 84.7% with a complete 1,2-DDO conversion was obtained within only 15 min over the Cu/SiO 2 -Al 2 O 3 at 250 °C under 10 MPa H 2 pressure. The temperature at 250 °C and the H 2 pressure higher than 3 MPa were conducive to the efficient production of 1-decanol from 1,2-DDO. In contrast to the previously reported noble metal catalysts, Cu/SiO 2 -Al 2 O 3 required a relatively high reaction temperature, while an extremely high 1-decanol productivity of 78 mmol g cat −1 h −1 could be achieved. Meanwhile, the hydrodeoxygenation of 1,2-decanediol over Cu/SiO 2 -Al 2 O 3 proceeded via a reaction mechanism in which decanal was formed as the intermediate. In addition, the Cu/SiO 2 -Al 2 O 3 catalyst was reusable at least five times without serious deactivation.
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