Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (4): 20220690.doi: 10.7503/cjcu20220690
• Physical Chemistry • Previous Articles Next Articles
GAO Fengyu1, CHEN Du1, LUO Ning1, YAO Xiaolong2, DUAN Erhong3, YI Honghong1, ZHAO Shunzheng1, TANG Xiaolong1()
Received:
2022-11-03
Online:
2023-04-10
Published:
2022-12-12
Contact:
TANG Xiaolong
E-mail:txiaolong@126.com
Supported by:
CLC Number:
TrendMD:
GAO Fengyu, CHEN Du, LUO Ning, YAO Xiaolong, DUAN Erhong, YI Honghong, ZHAO Shunzheng, TANG Xiaolong. Catalytic Performance and Reaction Mechanism of Chlorobenzene Oxidation over MnO x -CeO2 Catalyst[J]. Chem. J. Chinese Universities, 2023, 44(4): 20220690.
Catalyst | Crystal plane | 2θ/(°) | FWHM/(°) | d(Space)/nm | D/nm |
---|---|---|---|---|---|
CeO2 | (111) | 28.669 | 0.703 | 0.311 | 11.53 |
(200) | 33.133 | 0.722 | 0.270 | 11.35 | |
(220) | 47.583 | 0.759 | 0.191 | 11.31 | |
(311) | 56.470 | 0.712 | 0.163 | 12.52 | |
Mn2Ce1O x | (111) | 28.690 | 0.796 | 0.311 | 10.18 |
(200) | 33.332 | 0.744 | 0.269 | 11.02 | |
(220) | 47.806 | 0.786 | 0.190 | 10.93 | |
(311) | 56.752 | 0.826 | 0.162 | 10.81 |
Table 1 Different crystallite parameters of Mn2Ce1O xand CeO2 by XRD results
Catalyst | Crystal plane | 2θ/(°) | FWHM/(°) | d(Space)/nm | D/nm |
---|---|---|---|---|---|
CeO2 | (111) | 28.669 | 0.703 | 0.311 | 11.53 |
(200) | 33.133 | 0.722 | 0.270 | 11.35 | |
(220) | 47.583 | 0.759 | 0.191 | 11.31 | |
(311) | 56.470 | 0.712 | 0.163 | 12.52 | |
Mn2Ce1O x | (111) | 28.690 | 0.796 | 0.311 | 10.18 |
(200) | 33.332 | 0.744 | 0.269 | 11.02 | |
(220) | 47.806 | 0.786 | 0.190 | 10.93 | |
(311) | 56.752 | 0.826 | 0.162 | 10.81 |
Catalyst | Weak acid site(<200 ℃) | Middle acid site(200—450 ℃) | Strong acid site(>450 ℃) | Total amount/a.u.* |
---|---|---|---|---|
CeO2 | 0.82(24.6%) | 1.55(46.4%) | 0.97(29.0%) | 3.34 |
Mn2Ce1O x | 0.79(12.9%) | 2.77(45.1%) | 2.58(42.0%) | 6.14 |
MnO x | 0.14(5.5%) | 0.74(29.3%) | 1.65(65.2%) | 2.53 |
Table 2 Relative distribution of acid sites over CeO2, MnO x, and Mn2Ce1O x catalysts from NH3-TPD results
Catalyst | Weak acid site(<200 ℃) | Middle acid site(200—450 ℃) | Strong acid site(>450 ℃) | Total amount/a.u.* |
---|---|---|---|---|
CeO2 | 0.82(24.6%) | 1.55(46.4%) | 0.97(29.0%) | 3.34 |
Mn2Ce1O x | 0.79(12.9%) | 2.77(45.1%) | 2.58(42.0%) | 6.14 |
MnO x | 0.14(5.5%) | 0.74(29.3%) | 1.65(65.2%) | 2.53 |
Catalyst | Mn species(%) | Ce species(%) | O species(%) | Cl element (%, atom fraction) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mn2+ | Mn3+ | Mn4+ | Average | Ce3+ | Ce4+ | Ce3+/Ce4+ | Olatt | Oads | Oads/Olatt | ||
Fresh Mn2Ce1O x | 17.2 | 49.2 | 33.6 | 3.16 | 23.6 | 76.4 | 0.31 | 66.1 | 33.9 | 0.51 | ― |
Used Mn2Ce1O x | 24.9 | 42.6 | 32.5 | 3.08 | 26.6 | 73.4 | 0.36 | 75.7 | 24.3 | 0.32 | 1.93 |
Table 3 Relative distribution of Mn, Ce, O and Cl species of fresh and used Mn2Ce1O x catalysts from XPS results
Catalyst | Mn species(%) | Ce species(%) | O species(%) | Cl element (%, atom fraction) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mn2+ | Mn3+ | Mn4+ | Average | Ce3+ | Ce4+ | Ce3+/Ce4+ | Olatt | Oads | Oads/Olatt | ||
Fresh Mn2Ce1O x | 17.2 | 49.2 | 33.6 | 3.16 | 23.6 | 76.4 | 0.31 | 66.1 | 33.9 | 0.51 | ― |
Used Mn2Ce1O x | 24.9 | 42.6 | 32.5 | 3.08 | 26.6 | 73.4 | 0.36 | 75.7 | 24.3 | 0.32 | 1.93 |
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