Nickel Nanoparticles Decorated on Glucose-Derived Carbon Spheres as a Novel, Non-Palladium Catalyst for Epoxidation of Olefin

Abstract

Carbon spheres supporting nickel nanoparticles (NPs), generated by the integration of hydrothermal and microwave irradiation techniques, catalyzed the epoxidation of 1-octene, cyclooctene, styrene, allyl alcohol, and cyclohexene. The average particle sizes of the carbon spheres (CSs) and nickel oxide species immobilized on the CSs were 240 nm and 26 nm, respectively. The fabricated composites incorporating nickel NPs showed higher activity in the cyclohexene epoxidation process. The cyclohexene conversion was enhanced by raising the Ni loading to 10%. Within 14 h, the cyclohexene conversion had grown to 98%. This robust catalytic activity can be attributed to the efficient distribution of Ni species on the CSs, the facile lowering of the surface, and the development of uniformly nanosized species. The composite exhibited good recyclability across at least five cycles (which is not a simple task involving nickel-nanoparticle-based catalysts that are employed in water), and no nickel species leached into the solution, making the total system environmentally benign and cost-effective.

Selective Oxidation of Cyclohexene over the Mesoporous H-Beta Zeolite on Copper/Nickel Bimetal Catalyst in Continuous Reactor

“…Two prominent responses at 2θ of 7.8 and 25.3° are appropriate for H-Beta zeolites that possess a well-crystalline morphology in conformity with the literature. , The peaks associated with the metal-loaded H-beta zeolite exhibited the same peak as the pristine H-beta zeolite. In another sense, we may reasonably conclude from the graph that metal feeding does not adversely affect the H-beta morphology because of the resemblance in the peaks, which shows that the crystalline phase is retained despite loading H-Beta zeolite with the bimetal . This could also be attributed to the fact that each metal was an appropriate particle suspended on the H-Beta zeolite.…”

“…In another sense, we may reasonably conclude from the graph that metal feeding does not adversely affect the H-beta morphology because of the resemblance in the peaks, which shows that the crystalline phase is retained despite loading H-Beta zeolite with the bimetal. 46 This could also be attributed to the fact that each metal was an appropriate particle suspended on the H-Beta zeolite. According to the figure, the incorporation of (10%) Cu dosage marginally diminishes the intensity of the distinctive H-beta peaks at 27 and 33°.…”