10.1021/acs.est.7b00499.s001
Yaxin Chen
Yaxin
Chen
Jiayi Gao
Jiayi
Gao
Zhiwei Huang
Zhiwei
Huang
Meijuan Zhou
Meijuan
Zhou
Junxiao Chen
Junxiao
Chen
Chao Li
Chao
Li
Zhen Ma
Zhen
Ma
Jianmin Chen
Jianmin
Chen
Xingfu Tang
Xingfu
Tang
Sodium
Rivals Silver as Single-Atom Active Centers
for Catalyzing Abatement of Formaldehyde
American Chemical Society
2017
Sodium Rivals Silver
alkali metal catalysts
Synchrotron X-ray diffraction patterns
HCHO
HMO
surface lattice oxygen
transmission electron microscopy images
X-ray absorption spectra show
Na
sodium ions
H 2 O
CO
silver atoms
Ag
X-ray photoelectron spectra
2017-05-24 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Sodium_Rivals_Silver_as_Single-Atom_Active_Centers_for_Catalyzing_Abatement_of_Formaldehyde/5097433
The development of efficient alkali-based
catalysts for the abatement
of formaldehyde (HCHO), a ubiquitous air pollutant, is economically
desirable. Here we comparatively study the catalytic performance of
two single-atom catalysts, Na<sub>1</sub>/HMO and Ag<sub>1</sub>/HMO
(HMO = Hollandite manganese oxide), in the complete oxidation of HCHO
at low temperatures, in which the products are only CO<sub>2</sub> and H<sub>2</sub>O. These catalysts are synthesized by anchoring
single sodium ions or silver atoms on HMO(001) surfaces. Synchrotron
X-ray diffraction patterns with structural refinement together with
transmission electron microscopy images demonstrate that single sodium
ions on the HMO(001) surfaces of Na<sub>1</sub>/HMO have the same
local structures as silver atoms of Ag<sub>1</sub>/HMO. Catalytic
tests reveal that Na<sub>1</sub>/HMO has higher catalytic activity
in low-temperature oxidation of HCHO than Ag<sub>1</sub>/HMO. X-ray
photoelectron spectra and soft X-ray absorption spectra show that
the surface lattice oxygen of Na<sub>1</sub>/HMO has a higher electronic
density than that of Ag<sub>1</sub>/HMO, which is responsible for
its higher catalytic efficiency in the oxidation of HCHO. This work
could assist the rational design of cheap alkali metal catalysts for
controlling the emissions of volatile organic compounds such as HCHO.