Ni/SiO2 catalysts derived from carbothermal reduction of nickel phyllosilicate in the hydrogenation of levulinic acid to γ-valerolactone: The efficacy of nitrogen decoration
| Autor: | Yu Chuan Lin, Chou Hsun Hsieh, Cheng Chia Li |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
chemistry.chemical_classification
Ketone 010405 organic chemistry Reducing agent Process Chemistry and Technology chemistry.chemical_element 010402 general chemistry 01 natural sciences Nitrogen Catalysis 0104 chemical sciences chemistry.chemical_compound Nickel surgical procedures operative chemistry Carbothermic reaction Levulinic acid Physical and Theoretical Chemistry Carbon Nuclear chemistry |
| Zdroj: | Molecular Catalysis. 523:111720 |
| ISSN: | 2468-8231 |
| DOI: | 10.1016/j.mcat.2021.111720 |
| Popis: | Ni catalysts derived from the carbothermal reduction of nickel phyllosilicate were investigated and their application in the hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was revealed. The most effective catalyst (S3M1.5@NiPS-600) was prepared by using a sucrose-melamine mixture (molar ratio = 2:1) as the reducing agent with a proper thermal treatment (maintained at 600 °C for 2 h). By using S3M1.5@NiPS-600, a high GVL productivity (1387 mmol GVL/g surface Ni/h), good recyclability (4.9% loss of initial activity in five cycles), and a negligible deactivation rate were observed. The promising outcome was attributed to grafted carbon and nitrogen species on the carbothermally reduced Ni/SiO2 catalyst. Grafted carbon species improve catalyst stability whereas immobilized nitrogen species induce Niδ+ (δ>2) with a strong Lewis acidity. Paired Niδ+ and Ni0 sites are active in the reduction of the ketone group of LA, thereby enhancing the production of GVL. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect