Influence of g-C3N4 doping on the NH3-SCR activity of Cerium–tungsten–titanium mixed oxide catalyst

• Published in: Journal of materials research Vol. 37; no. 3; pp. 835 - 848
• Main Authors: Xiong, Zhi-bo, Guo, Fu-cheng, Zhang, Jia-xin, Lu, Wei, Shi, Huan-cong
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 14-02-2022; Springer Nature B.V
• Subjects: Ammonia; Applied and Technical Physics; Biomaterials; Carbon nitride; Catalysts; Cerium; Chemical precipitation; Chemistry and Materials Science; Coprecipitation; Doping; Inorganic Chemistry; Mass ratios; Materials Engineering; Materials research; Materials Science; Melamine; Mixed oxides; Nanotechnology; Oxygen; Synergistic effect; Thermal decomposition; Titanium; Tungsten; NO; SCR; Cerium-tungsten-titanium mixed oxide; ); NH; Synergistic effect; reduction; N; Graphitic carbon nitride (g-C
• ISSN: 0884-2914; 2044-5326
• DOI: 10.1557/s43578-022-00489-2

Herein, graphitic carbon nitride (g-C
3
N
4
) was firstly introduced to optimize the NH
3
-SCR activity of Ce
20
W
10
Ti
100
O
z
by adding excess melamine (Mel) into its mixed solution after the hydrothermal co-precipitation. The results indicate that both the modification of Mel and the doping of g-C
3
N
4
contribute to improve the catalytic performance of NO
x
reduction over Ce
20
W
10
Ti
100
O
z
when the mass ratios of Mel and Ti(SO
4
)
2
were kept at 4:2 and 8:2, respectively. Furthermore, the results of XPS demonstrate that the doped g-C
3
N
4
could increase the concentration of adsorbed oxygen on the surface of Ce
20
W
10
Ti
100
O
z
, and Ce
20
W
10
Ti
100
O
z
–Mel
4
presents higher proportion of adsorbed oxygen (44.4%) compared to Ce
20
W
10
Ti
100
O
z
–Mel
2
. Therefore, there exists a synergistic effect between the doped g-C
3
N
4
and the active components of Ce/W/Ti, which helps improve the NH
3
-SCR activity of Ce
20
W
10
Ti
100
O
z
, although the presence of cerium-tungsten-titanium mixed oxide shows the catalytic effect on the thermal decomposition of the doped g-C
3
N
4
in it.
Graphical abstract
Promotional effect of g-C
3
N
4
doping on the NH
3
-SCR activity of cerium–tungsten–titanium composite oxide catalyst prepared by hydrothermal co-precipitation.