Efficient Cu-ZnO/TiO₂ Catalyst for Direct N-Methylation of N-Methylaniline with CO₂ and H₂

ACS Sustainable Chemistry & Engineering, Год журнала: 2025, Номер unknown

Опубликована: Янв. 2, 2025

The preparation of methyl-substituted amines by direct N-methylation with CO2/H2 is an important reaction for CO2 utilization and organic synthesis. However, the design construction effective stable non-noble-metal catalysts this remain challenging. Here, a cheap non-noble-Cu-based catalyst was prepared applied in N-methylaniline H2. 5%Cu-ZnO(3.75%)/TiO2 showed 98.8% yield initial TOF 7.7 h–1 after 24 h under 453 K, 1.5 MPa CO2, 4.5 H2, which superior to 5%Cu/TiO2, 5%Cu/ZnO, reported Cu-based catalysts. Furthermore, can be reused at least four times various excellent selectivity. characterizations experimental results that Cu0 active site, exhibited largest surface amount, thereby contributing catalytic performance. mechanism H2 proposed based on spectroscopic studies, kinetic control experiments. proceeded HCHO N-methylformanilide intermediates, formation from rate-determining step.

Язык: Английский

Selective N-methylation of amines, nitro compounds and nitriles with CO2/H2 by Cu-ZnO/TiO2 catalyst

Fuel, Год журнала: 2025, Номер 393, С. 135006 - 135006

Опубликована: Март 12, 2025

Язык: Английский