Nickel-Rich Carbon Sheet Derived from Ni-NH2–BDC Catalyzes Microalgal Biodiesel into Biojet Fuel under CO2 Atmosphere

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Abstract
To address the challenges of low utilization of active sites and poor thermal stability of catalysts in the conversion of microalgal biodiesel into biojet fuel under CO2 atmosphere, a nickel-rich carbon sheet catalyst was synthesized through partial pyrolysis of a nickel-based aminoterephthalic acid framework (Ni-NH2–BDC) to enhance conversion rate and product selectivity. Because the specific surface area of Ni-NC-500 derived from pyrolyzed Ni-NH2–BDC at 500 °C increased from 20.866 to 304.337 m2/g, more generated Ni0 active sites (33.69%) strengthened the deoxidation of methyl palmitate (a typical composition of microalgal biodiesel). Compared with Ni-NH2–BDC, the total acid of Ni-NC-500 has significantly increased, reaching 58.485 mmol/g, which will promote C–C bond breaking. The large amounts of pyridine nitrogen (N-6, 39.98%) and pyrrole nitrogen (N-5, 60.13%) present in Ni-NC-500 can significantly enhance the catalytic performance. Therefore, the conversion rate of methyl palmitate and the selectivity for jet-fuel range (C8–C16) products increased to 96.28 and 84.69%, respectively.
Funding Information
  • National Natural Science Foundation of China (52276172)

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