posted on 2021-11-02, 12:35authored byJing Wang, Sisi Fan, Hongmin Duan, Jinming Xu, Yanqiang Huang
Carbon
spheres with hierarchical pore structure were successfully
synthesized by using strongly basic anion exchange resins exchanged
with silicate, followed by pyrolysis in an inert atmosphere and etching
silica. As a result of the quaternary ammonium group in the anion
exchange resin structure, these carbon spheres were doped with nitrogen.
The performance of these carbon spheres in the catalytic dehydrochlorination
of 1,2-dichloroethane (EDC) was improved with the increase of calcination
temperature, and the carbon sphere 900-900-RC showed the highest conversion
rate (96.7%) and a selectivity to vinyl chloride above 99%. The structural
and surface properties of N-doped carbon spheres were characterized
by scanning electron microscopy, nitrogen sorption, and Raman and
X-ray photoelectron spectroscopy. The result of these characterizations
further verified that the quaternary nitrogen species are as effective
as pyridine nitrogen species in this catalyst.