Chem. J. Chinese Universities ›› 2019, Vol. 40 ›› Issue (7): 1447.doi: 10.7503/cjcu20190091
• Physical Chemistry • Previous Articles Next Articles
LI Chunxiao, LI Jian*(), LIANG Wenjun, LIANG Quanming
Received:
2019-02-01
Online:
2019-07-10
Published:
2019-07-12
Contact:
LI Jian
E-mail:ljian@bjut.edu.cn
Supported by:
CLC Number:
TrendMD:
LI Chunxiao, LI Jian, LIANG Wenjun, LIANG Quanming. Low Temperature NH3-SCR Activity of Cr Doped V2O5-WO3/TiO2 Catalyst†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1447.
Catalyst | Specific surface area/(m2·g-1) | Pore volume/(cm3·g-1) | Average pore size/nm |
---|---|---|---|
3V6W/TiO2 | 78.857 | 0.380 | 17.533 |
1Cr3V6W/TiO2 | 66.756 | 0.325 | 17.944 |
3Cr3V6W/TiO2 | 66.182 | 0.312 | 18.028 |
5Cr3V6W/TiO2 | 65.287 | 0.310 | 18.523 |
7Cr3V6W/TiO2 | 63.937 | 0.301 | 18.729 |
9Cr3V6W/TiO2 | 62.172 | 0.293 | 19.239 |
Table 1 Specific surface area, pore volume and average pore size of the catalysts
Catalyst | Specific surface area/(m2·g-1) | Pore volume/(cm3·g-1) | Average pore size/nm |
---|---|---|---|
3V6W/TiO2 | 78.857 | 0.380 | 17.533 |
1Cr3V6W/TiO2 | 66.756 | 0.325 | 17.944 |
3Cr3V6W/TiO2 | 66.182 | 0.312 | 18.028 |
5Cr3V6W/TiO2 | 65.287 | 0.310 | 18.523 |
7Cr3V6W/TiO2 | 63.937 | 0.301 | 18.729 |
9Cr3V6W/TiO2 | 62.172 | 0.293 | 19.239 |
Catalyst | Eb/eV | Surface atomic concentration | V5+/V4+ | Oβ/Oα | Cr6+/Cr3+ | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
V2p | Cr2p | O1s | O | V | Cr | |||||||
3V6W/TiO2 | 516.4 | 517.1 | — | — | 530.0 | 531.6 | 13.52 | 1.00 | — | 1.401 | 0.127 | |
3Cr3V6W/TiO2 | 516.4 | 517.1 | 575.8 | 579.5 | 529.9 | 531.4 | 16.06 | 0.91 | 1.09 | 0.312 | 0.425 | 0.230 |
Table 2 Binding energies and surface atomic concentrations of O, Cr and V for the prepared catalysts determined from deconvoluted XPS spectra*
Catalyst | Eb/eV | Surface atomic concentration | V5+/V4+ | Oβ/Oα | Cr6+/Cr3+ | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
V2p | Cr2p | O1s | O | V | Cr | |||||||
3V6W/TiO2 | 516.4 | 517.1 | — | — | 530.0 | 531.6 | 13.52 | 1.00 | — | 1.401 | 0.127 | |
3Cr3V6W/TiO2 | 516.4 | 517.1 | 575.8 | 579.5 | 529.9 | 531.4 | 16.06 | 0.91 | 1.09 | 0.312 | 0.425 | 0.230 |
Fig.6 In situ DRIFTs spectra of catalysts(A) 3V6W/TiO2 adsorbed NH3 in 1%NH3-N2 and desorbed in N2; (B) 3Cr3V6W/TiO2 adsorbed NH3 in 1%NH3-N2 and desorbed in N2; (C) 3V6W/TiO2 adsorbed NH3 in 1%NH3-N2 then reacted in 0.1%NO+5%O2/N2; (D) 3Cr3V6W/TiO2 adsorption in 1%NH3-N2 then reacted in 0.1%NO+5%O2-N2.
Fig.7 UV-Vis spectra of catalysts(A) 200—800 nm; (B) 350—800 nm(3V6W/TiO2 sample as background). a. 3V6W/TiO2;b. 1Cr3V6W/TiO2; c. 3Cr3V6W/TiO2; d. 5Cr3V6W/TiO2; e. 7Cr3V6W/TiO2; f. 9Cr3V6W/TiO2.
Fig.8 NH3-SCR activity(A), N2 selective(B) and SO2 resistance(C) of catalystsa. 1Cr3V6W/TiO2; b. 3Cr3V6W/TiO2; c. 3V6W/TiO2; d. 5Cr3V6W/TiO2; e. 7Cr3V6W/TiO2; f. 9Cr3V6W/TiO2.
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