Efficient Olefins Epoxidation on Ultrafine H2O–WOx Nanoparticles with Spectroscopic
Evidence of Intermediate Species
Posted on 2019-09-06 - 07:29
Design
and synthesis of high-performance heterogeneous catalysts
are of immense interest in chemical industries. Herein, ultrafine
H2O coordinated WOx nanoparticles
(H2O–WOx, average diameter
2.24 nm) embedded into porous carbon matrix have been obtained via
space-confinement pyrolysis with postmodification oxidation approach.
The synthesized H2O–WOx nanoparticles exhibit high activities toward olefin epoxidation
reaction using H2O2 as oxidant. In epoxidation
of cis-cyclooctene, the turnover frequency of the
catalyst can achieve as high as 949 h–1, an activity
comparable to the highest of all reported early transition-metal based
catalysts. UV–vis spectra and controlled catalytic experiments
have been performed to ascertain the possible active site in the catalyst:
compared with traditional WO3 and peroxide coordinated
W-(η2-O2) species, the water coordinated
H2O–WOx can transform
to hydroperoxide HOO–WOx in the
presence of H2O2, and the HOO–WOx species can be further activated by proton
acid to enhance its catalytic activities.
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Zhang, Mengrui; Singh, Vikram; Hu, Xuefu; Ma, Xinyi; Lu, Jingkun; Zhang, Chao; et al. (2019). Efficient Olefins Epoxidation on Ultrafine H2O–WOx Nanoparticles with Spectroscopic
Evidence of Intermediate Species. ACS Publications. Collection. https://doi.org/10.1021/acscatal.9b01226