1. Highly Active Nickel (II) Oxide-Supported Cerium Oxide Catalysts for Valorization of Glycerol into Oxygenated Fuel Additives.
- Author
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Appaturi, Jimmy Nelson, Maireles-Torres, Pedro, Alomar, Taghrid S., AlMasoud, Najla, El-Bahy, Zeinhom M., Ling, Tau Chuan, and Ng, Eng-Poh
- Subjects
CERIUM oxides ,FUEL additives ,GLYCERIN ,ACETIC acid ,SOL-gel processes ,CATALYSTS ,MICROWAVE heating - Abstract
Acetylation of glycerol to yield monoacetin (MAT), diacetin (DAT), and triacetin (TAT) over NiO-supported CeO
2 (xNiO/CeO2 ) catalysts is reported. The catalysts were synthesized utilizing a sol-gel technique, whereby different quantities of NiO (x = 9, 27, and 45 wt%) were supported onto the CeO2 substrate, and hexadecyltrimethylammonium bromide (CTABr) served as a porogen. The utilization of EDX elemental mapping analysis confirmed the existence of evenly distributed Ni2+ ion and octahedral NiO nanoparticles on the CeO2 surface through the DRS UV-Vis spectroscopy. The most active catalyst is 27NiO/CeO2 based on TAT selectivity in the glycerol acetylation with ethanoic acid, attaining 97.6% glycerol conversion with 70.5% selectivity to TAT at 170 °C with a 1:10 glycerol/ethanoic acid molar ratio for 30 min using a non-microwave instant heating reactor. The 27NiO/CeO2 is reusable without significant decline in catalytic performance after ten consecutive reaction cycles, indicating high structure stability with accessible active acidity. [ABSTRACT FROM AUTHOR]- Published
- 2023
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