Nanosheet like CaO/C derived from Ca-BTC for biodiesel production assisted with microwave

• Published in: Applied energy Vol. 326; p. 120045
• Main Authors: Li, Hui, Wang, Yongbo, Han, Zhihao, Wang, Tianyu, Wang, Yunpu, Liu, Chenhui, Guo, Min, Li, Guoning, Lu, Wanpeng, Yu, Mingzhi, Ma, Xiaoling
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.11.2022
• Subjects: Biodiesel; CaO; Dielectric property; Microwave; MOFs; CaO; Microwave; MOFs; Dielectric property; Biodiesel
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2022.120045

[Display omitted] •Nanosheet like structure CaO/C is constructed from Ca-BTC.•CaO is tightly anchored in carbon nanosheet and possesses ultrahigh surface area.•Ca-800N owns strong microwave absorbing capacity with ε’’ of 3.64 F/m.•Ca-800N exhibits highly stable catalytic activity in transesterification with microwave. Calcium oxide (CaO) is recognized as an efficient heterogeneous catalyst for biodiesel production. Nevertheless, the stability of CaO has always been a great challenge. This study creatively designs a highly stable CaO catalyst with strong microwave absorbing capacity, of which CaO is anchored in nanosheet carbon. For this purpose, Ca-BTC (Benzenetricarboxylic acid, BTC) is initially synthesized and calcined in nitrogen atmosphere, the obtained catalyst is characterized by TG, XRD, TEM, EDS, SEM, XPS, FTIR, Hammett indicator, N2 absorption/desorption, and the dielectric property is also evaluated. Results indicated the prepared Ca-800N achieves the maximum conversion of 97.37% with catalyst amount of 8 wt% and molar ratio of methanol/oil of 9:1 at 60 °C within 30 min in 400 W microwave field, the conversion of 94.01% is still achieved after being used six cycles. Furthermore, dielectric constant and dielectric dissipation factor of Ca-800N is measured as 33.11 F/m and 3.64 F/m.