Chinese Journal of Catalysis ›› 2024, Vol. 61: 71-96.DOI: 10.1016/S1872-2067(24)60043-4
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Honghong Zhang, Zhiwei Wang, Lu Wei, Yuxi Liu, Hongxing Dai, Jiguang Deng*()
Received:
2024-02-25
Accepted:
2024-04-10
Online:
2024-06-18
Published:
2024-06-20
Contact:
* E-mail: About author:
Jiguang Deng (College of Materials Science and Engineering, Beijing University of Technology (BJUT)) received his Ph.D. degree from BJUT (China) in 2010. Since then, he has been working at BJUT and is currently a professor. His research interests focus on low carbon environmental chemistry, environmental catalysis and photothermal catalysis technologies for the elimination or utilization of typical gaseous pollutants (VOCs, NOx, CH4, CO2, and NH3). He has published more than 260 refereed journal papers with citation over 13000 and H-index of 67.
Supported by:
Honghong Zhang, Zhiwei Wang, Lu Wei, Yuxi Liu, Hongxing Dai, Jiguang Deng. Recent progress on VOC pollution control via the catalytic method[J]. Chinese Journal of Catalysis, 2024, 61: 71-96.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(24)60043-4
VOCs type | Catalyst | VOCs concentration (vol%) | Oxygen concentration (vol%) | Space velocity (mL/(g·h)) | T90% (°C) | Ea (kJ/mol) | Ref. |
---|---|---|---|---|---|---|---|
Methane | Pd2.41Pt | 2.5 | 20 | 100000 | 322 | — | [ |
0.97 wt% Pd/3DOM LaMnAl11O19 | 2.5 | 20 | 20000 | 343 | — | [ | |
Pd-GaOx/Al2O3 | 0.5 | 4 | 80000 | 372 | — | [ | |
1.81Pd2.1Pt/6.70MnOx/3DOM CoFe2O4 | 2.5 | 20 | 20000 | 372 | 59 | [ | |
0.44PtPd2.20/ZrO2 | 2.5 | 20 | 20000 | 408 | 59 | [ | |
Au-Pd-0.40CoO/3DOM Co3O4 | 2.5 | 10 | 20000 | 341 | 63 | [ | |
2.94Au0.50Pd/meso-Co3O4 | 2.5 | 20 | 20000 | 324 | 44.4 | [ | |
Co3.5Pd/3DOM CeO2 | 2.5 | 20 | 40000 | 480 | 58 | [ | |
Propane | CoCeOx-70 | 0.2 | 5 | 120000 | 310 | 97 | [ |
Pt1Co1/meso-NaxMnOy | 0.2 | 20 | 30000 | 282 | 76.0 | [ | |
Pd1/AlCo2O4-Al2O3 | 0.5 | 20 | 40000 | 358 | - | [ | |
Benzene | 6.5Au/meso-Co3O4 | 0.1 | 40 | 20000 | 189 | 55 | [ |
0.93Pd/meso-CoO | 0.1 | 20 | 40000 | 189 | — | [ | |
0.56Pt/meso-CoO | 0.1 | 40 | 80000 | 186 | — | [ | |
0.25Pt1/meso-Fe2O3 | 0.1 | 20 | 20000 | 198 | — | [ | |
0.0383Pt1/OMS-2 | 0.1 | 20 | 20000 | 189 | 41.8 | [ | |
Pd1Co1/Al2O3 | 0.1 | 20 | 40000 | 250 | 57 | [ | |
PtW/Al2O3-2 | 0.1 | 20 | 40000 | 140 | 72 | [ | |
TiO2/PdW-S1 | 0.1 | 20 | 40000 | 200 | 56 | [ | |
Toluene | 0.28Pd/S-1-H | 0.1 | 20 | 40000 | 189 | 41 | [ |
0.2 wt% Pt/TiO2 | 0.1 | 40 | 40000 | 183 | — | [ | |
1.3Pt/8.9Co3O4/3DOM Al2O3 | 0.1 | 40 | 20000 | 160 | 42.6 | [ | |
6.5Au/meso-Co3O4 | 0.1 | 40 | 20000 | 138 | 45 | [ | |
0.37Pt-0.16MnOx/meso-CeO2 | 0.1 | 20 | 40000 | 171 | — | [ | |
3.8AuPd1.92/3DOM Mn2O3 | 0.1 | 40 | 40000 | 162 | 26 | [ | |
0.96(AuPd1.92)/Co3O4 | 0.1 | 40 | 40000 | 180 | — | [ | |
1.99AuPd/3DOM Co3O4 | 0.1 | 40 | 40000 | 168 | 33 | [ | |
1,2-Dichloroethane | Ru/WO3 | 0.1 | 20 | 40000 | 340 | — | [ |
RuP/3DOM WOx | 0.1 | 20 | 40000 | 353 | — | [ | |
RuCo/HZSM-5 | 0.1 | 20 | 20000 | 281 | 36 | [ | |
RuCo/Al2O3 | 0.1 | 20 | 20000 | 391 | 104 | [ | |
10CrOx-TiO2 | 0.1 | 20 | 40000 | 284 | 35 | [ | |
Trichloroethylene | 0.98Ru/3DOM SnO2 | 0.1 | 20 | 40000 | 300 | 44 | [ |
0.93Ru2.87Pd/3DOM CeO2 | 0.1 | 20 | 20000 | 298 | 41 | [ | |
0.91Au0.51Pd/3DOM TiO2 | 0.075 | 20 | 20000 | 400 | 51.7 | [ | |
2.85AuPd1.87/3DOM CeO2 | 0.075 | 20 | 20000 | 415 | 33 | [ | |
3DOM 5.5Cr2O3-CeO2 | 0.075 | 20 | 20000 | 255 | 81 | [ |
Table 1 Catalytic performance of different sorts of catalysts for typical VOC oxidation.
VOCs type | Catalyst | VOCs concentration (vol%) | Oxygen concentration (vol%) | Space velocity (mL/(g·h)) | T90% (°C) | Ea (kJ/mol) | Ref. |
---|---|---|---|---|---|---|---|
Methane | Pd2.41Pt | 2.5 | 20 | 100000 | 322 | — | [ |
0.97 wt% Pd/3DOM LaMnAl11O19 | 2.5 | 20 | 20000 | 343 | — | [ | |
Pd-GaOx/Al2O3 | 0.5 | 4 | 80000 | 372 | — | [ | |
1.81Pd2.1Pt/6.70MnOx/3DOM CoFe2O4 | 2.5 | 20 | 20000 | 372 | 59 | [ | |
0.44PtPd2.20/ZrO2 | 2.5 | 20 | 20000 | 408 | 59 | [ | |
Au-Pd-0.40CoO/3DOM Co3O4 | 2.5 | 10 | 20000 | 341 | 63 | [ | |
2.94Au0.50Pd/meso-Co3O4 | 2.5 | 20 | 20000 | 324 | 44.4 | [ | |
Co3.5Pd/3DOM CeO2 | 2.5 | 20 | 40000 | 480 | 58 | [ | |
Propane | CoCeOx-70 | 0.2 | 5 | 120000 | 310 | 97 | [ |
Pt1Co1/meso-NaxMnOy | 0.2 | 20 | 30000 | 282 | 76.0 | [ | |
Pd1/AlCo2O4-Al2O3 | 0.5 | 20 | 40000 | 358 | - | [ | |
Benzene | 6.5Au/meso-Co3O4 | 0.1 | 40 | 20000 | 189 | 55 | [ |
0.93Pd/meso-CoO | 0.1 | 20 | 40000 | 189 | — | [ | |
0.56Pt/meso-CoO | 0.1 | 40 | 80000 | 186 | — | [ | |
0.25Pt1/meso-Fe2O3 | 0.1 | 20 | 20000 | 198 | — | [ | |
0.0383Pt1/OMS-2 | 0.1 | 20 | 20000 | 189 | 41.8 | [ | |
Pd1Co1/Al2O3 | 0.1 | 20 | 40000 | 250 | 57 | [ | |
PtW/Al2O3-2 | 0.1 | 20 | 40000 | 140 | 72 | [ | |
TiO2/PdW-S1 | 0.1 | 20 | 40000 | 200 | 56 | [ | |
Toluene | 0.28Pd/S-1-H | 0.1 | 20 | 40000 | 189 | 41 | [ |
0.2 wt% Pt/TiO2 | 0.1 | 40 | 40000 | 183 | — | [ | |
1.3Pt/8.9Co3O4/3DOM Al2O3 | 0.1 | 40 | 20000 | 160 | 42.6 | [ | |
6.5Au/meso-Co3O4 | 0.1 | 40 | 20000 | 138 | 45 | [ | |
0.37Pt-0.16MnOx/meso-CeO2 | 0.1 | 20 | 40000 | 171 | — | [ | |
3.8AuPd1.92/3DOM Mn2O3 | 0.1 | 40 | 40000 | 162 | 26 | [ | |
0.96(AuPd1.92)/Co3O4 | 0.1 | 40 | 40000 | 180 | — | [ | |
1.99AuPd/3DOM Co3O4 | 0.1 | 40 | 40000 | 168 | 33 | [ | |
1,2-Dichloroethane | Ru/WO3 | 0.1 | 20 | 40000 | 340 | — | [ |
RuP/3DOM WOx | 0.1 | 20 | 40000 | 353 | — | [ | |
RuCo/HZSM-5 | 0.1 | 20 | 20000 | 281 | 36 | [ | |
RuCo/Al2O3 | 0.1 | 20 | 20000 | 391 | 104 | [ | |
10CrOx-TiO2 | 0.1 | 20 | 40000 | 284 | 35 | [ | |
Trichloroethylene | 0.98Ru/3DOM SnO2 | 0.1 | 20 | 40000 | 300 | 44 | [ |
0.93Ru2.87Pd/3DOM CeO2 | 0.1 | 20 | 20000 | 298 | 41 | [ | |
0.91Au0.51Pd/3DOM TiO2 | 0.075 | 20 | 20000 | 400 | 51.7 | [ | |
2.85AuPd1.87/3DOM CeO2 | 0.075 | 20 | 20000 | 415 | 33 | [ | |
3DOM 5.5Cr2O3-CeO2 | 0.075 | 20 | 20000 | 255 | 81 | [ |
Fig. 1. Methane conversion varied with the temperature when the reaction temperature rose (solid) or dropped (hollow) over 3DOM Co3O4 loaded Au-Pd-3.61CoO (a), Au-Pd (b), and Pd-3.61CoO (c). Reproduced with permission from Ref. [51]. Copyright 2017, American Chemical Society.
Fig. 2. Diagram of the Pd/Al2O3 and Pd-GaOx/Al2O3 catalysts after calcination, hydrothermal aging treatments, and catalytic CH4 oxidation process. Reproduced with permission from Ref. [48]. Copyright 2018, Wiley-VCH Verlag GmbH & Co. KgaA, Weinheim.
Fig. 3. (a) Diagram for transforming PdCo nanocrystals to single atoms. (b) TEM images and EDX element mapping for PdCo nanocrystals. (c) Ac-HAADF-STEM image of Pd1/AlCo2O-Al2O3. Bright spots represent individual Pd atoms. (d) EDX element mapping of Pd1/AlCo2O4-Al2O3. Reproduced with permission from Ref. [56]. Copyright 2023, American Chemical Society.
Fig. 4. TEM (a) and HAADF-STEM (b,c) images, EDX line scan (d), and EDX elemental mappings (e) of PtW-2 NPs. (f) Benzene conversion as a function of temperature over different samples (solid line and dotted line represent the absence and presence of 100 ppm DCE, respectively). Reproduced with permission from Ref. [63]. Copyright 2020, Elsevier.
Fig. 6. SEM images of 3DOM Mn2O3 (a), 0.2Pt/3DOM Mn2O3 (b,c), 0.5Pt/3DOM Mn2O3 (d,e), 1.6 Pt/3DOM Mn2O3 (f,g), 2.3Pt/3DOM Mn2O3 (h,i), and 2.0Pt/3DOM Mn2O3-imp (j). Reproduced with permission from Ref. [106]. Copyright 2019, Elsevier.
Fig. 7. HAADF-STEM images (a-d), Pt NPs size distributions (e,f), and toluene conversion (g,h) of 2.3Pt/3DOM Mn2O3 (a,c,e,g) and 2.0Pt/3DOM Mn2O3-imp (b,d,f,h) before and after calcination treatments in air at 650 °C. Reproduced with permission from Ref. [106]. Copyright 2019, Elsevier.
Fig. 8. SEM and TEM images of MOF-74 (a), Co3O4-R (b,c), MOF-39 (d), and Co3O4-S (e,f). (g) Diagram illustrating the catalytic mechanism involved in the catalytic o-xylene oxidation over Co3O4 with different shapes. Reproduced with permission from Ref. [123]. Copyright 2021, American Chemical Society.
Fig. 9. Investigated L-H (a) and E-R (b) mechanisms of HCHO oxidation reaction on Ti/Ti3C2O2 surface. Reproduced with permission from Ref. [137]. Copyright 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences.
Fig. 11. Possible reaction pathways of 1,2-DCE oxidation over RuP/WOx. Reproduced with permission from Ref. [73]. Copyright 2021, American Chemical Society.
Fig. 12. 1,2-DCE conversion (a) and C2H3Cl concentration (b) as a function of temperature over the WO3 and Ru/WO3 samples in the presence or absence of water vapor. Reproduced with permission from Ref. [72]. Copyright 2021, Elsevier.
Fig. 13. Toluene (a) and iso-hexane (b) conversion as a function of time over different samples. (c) Schematic diagram of catalytic stability process of toluene oxidation on Pt1/MnOx and H2-Pt1/MnOx-200. Reproduced with permission from Ref. [153]. Copyright 2021, Elsevier.
Fig. 14. Proposed reaction mechanism for toluene and iso-hexane oxidation over the Pt/M and Pt-Cu/M catalysts. Reproduced with permission from Ref. [154]. Copyright 2022, Elsevier.
Fig. 15. NO conversion and N2 selectivity (a), CB conversion (b), and CO2 selectivity (c) in the SCR/CBCO over different samples. (d) The energy and optimal structure of CB or NH3 adsorbed on the Al-CeO2, CeO2, and Ta-CeO2 structures. Blue, white, green, and gray are the colors of N, H, Cl, and C atoms, respectively. Reproduced with permission from Ref. [165]. Copyright 2021, Elsevier.
Fig. 16. (a) Schematic diagram of the preparation process of Ru/Cu-SZ-13 and the reaction route of NO and CB. (b) TEM images and particle size distribution of RuO2 nanoparticles. (c) HRTEM images of RuO2 NPs. (d) HRTEM images of CHA zeolite in Ru/Cu SZ-13. (e) Schematic diagram of the reaction mechanism of synergistic catalysis of NO and CB. Reproduced with permission from Ref. [167]. Copyright 2023, Wiley-VCH GmbH.
Fig. 17. (a) Toluene conversion and CO2 yield over different samples. (b) Toluene conversion and CO2 yield over 0.5 Pt1/Fe2O3 at varying light intensities. Reproduced with permission from Ref. [171]. Copyright 2021, Elsevier. Toluene oxidation (c) and CO2 yield (d) on 0.39Pt1/CuO-CeO2 and CuO-CeO2 catalysts in the dark or under simulated solar illumination. Reproduced with permission from Ref. [173]. Copyright 2022, American Chemical Society.
Fig. 18. (a) Effect of H2O concentration on catalytic stability over the Pt/CeO2/TiO2. (b) The structure diagram of Pt/CeO2/TiO2 and Pt/TiO2 and the reaction mechanism of photocatalytic oxidation of heptane and hexanal. Reproduced with permission from Ref. [174]. Copyright 2022, American Chemical Society.
Fig. 19. (a) Diagrammatic sketch of the 1.1 wt% AuCu0.75/Al2O3 preparation process. (b) HAADF-STEM image of AuCu NPs. (c) Product selectivity over 1.1 wt% AuCu0.75/Al2O3. Reproduced with permission from Ref. [180]. Copyright 2022, Wiley-VCH GmbH.
Fig. 20. (a) Isopropanol-selective oxidation process. (b) Energy diagrams of isopropanol-selective oxidation. (c) Adsorption energy of isopropanol, acetone, and O2, respectively. (d) Partial density of states (PDOS). Reproduced with permission from Ref. [181]. Copyright 2023, American Chemical Society.
VOCs type | Catalyst | H2O content (vol%) | Effect of H2O on catalytic activity | CO2 content (vol%) | Effect of CO2 on catalytic activity | SO2 content (ppm) | Effect of SO2 on catalytic activity | Ref. |
---|---|---|---|---|---|---|---|---|
Methane | Pd2.41Pt | 2.5 or 5 | catalytically stable | 2.5 or 5 | no significant decline | 100 | dropped sharply | [ |
Methane | 1.14Pd2.8Pt/ 3DOM LMAO | 5 | decreased slightly | 5 | without decline | 100 | decreased significantly | [ |
Methane | 0.44PtPd2.20/ ZrO2 | 10 | decreased significantly | — | — | 100 | decreased significantly | [ |
Methane | 1.93AuPd1.95/3DOM CoCr2O4 | 5 | decreased slightly | — | — | 100 | decreased slightly | [ |
n-Hexane | Co1Ni1/meso-Cr2O3 | 10 | minor negative effect | 5 | not changed distinctly | — | — | [ |
Acetylene | 0.59IrFe0.90/meso-CeO2 | 1 or 5 | no significant changes | 5 | not altered significantly | 50 | decreased significantly | [ |
Benzene | 0.25 Pt1/meso-Fe2O3 | 1 or 3 | enhancement effect | 2.5 | not change obviously | — | — | [ |
Benzene | 0.0383Pt1/OMS-2 | 1.5, 3, or 5 | decreased significantly | 5 | no obvious changes | — | — | [ |
Benzene | TiO2/PdW-S1 | 1 or 5 | almost does not affect | 5 | not change obviously | — | — | [ |
Toluene | 0.28Pd/S-1-H | 2 or 5 | decreased slightly | 5 | decreased slightly | 50 | declined sharply | [ |
Toluene | 0.2 wt% Pt/TiO2 | 2, 5, or 10 | decreased slightly | 2.5, 5, or 10 | weak negative influence | 50 | decreased rapidly | [ |
Toluene | 2.3 wt% Pt/3DOM Mn2O3 | 3 or 5 | decreased slightly | 3 | decreased slightly | 40 | decreased gradually | [ |
Toluene | 0.46PdPt2.10/V2O5-TiO2 | 5 | no significant changes | 5 | no significant decrease | 50 | decreased slightly | [ |
Toluene | 0.37Pt−0.16MnOx/meso-CeO2 | 1, 3 or 5 | no considerable changes | 5 | decreased slightly | — | — | [ |
Toluene | 1.98PtRu@3DOM CZO | 5 | decreased slightly | 10 | no significant changes | 40 | declined considerably | [ |
Methanol | 0.70Pt2.42Co/meso-MnOy | 3 | obviously inhibited | 5 | obviously inhibited | — | — | [ |
Methanol | 0.68Ag0.75Au1.14Pd/meso-Co3O4 | 3 | decreased slightly | 5 | decreased slightly | — | — | [ |
Acetone | 0.57 wt% CeO2-0.05 wt% Pt/TiO2 | 2.5, 5, 10, or 20 | obviously inhibited | 5 or 10 | obviously inhibited | 100 | decreased significantly | [ |
Trichloroethylene | 0.91Au0.51Pd/3DOM TiO2 | 3 or 5 | slight decrease | 5 or 10 | slight decrease | — | — | [ |
Trichloroethylene | 2.85AuPd1.87/3DOM CeO2 | 3 or 5 | slight decrease | 3 or 7 | slight decrease | — | — | [ |
Trichloroethylene | 0.93Ru2.87Pd/3DOM CeO2 | 3 or 5 | obviously inhibited | 5 or 10 | obviously inhibited | — | — | [ |
1,2-Dichloroethane | RuCo/HZSM-5 | 5 | slight decrease | — | — | 100 | marked decline | [ |
1,2-Dichloroethane | Ru/WO3 | 5 | enhancement effect | — | — | — | — | [ |
1,2-Dichloroethane | Ru/TiO2-HPW | 5 | enhancement effect | — | — | — | — | [ |
Toluene | 0.5Pt1/Fe2O3 | 5 or 10 | slight decrease | 5 or 10 | negligible effect | 20 | slight decrease | [ |
Heptane and hexane | Pt/CeO2/TiO2 | 5, 10, or 20 | enhancement effect | — | — | — | — | [ |
Ethyl acetate | 0.26Pd/3.2 N-TiO2 | 5 | enhancement effect | 10 | negligible effect | — | — | [ |
Table 2 Summary of the effect of H2O, CO2, and SO2 on the reaction in the different catalytic oxidation reaction.
VOCs type | Catalyst | H2O content (vol%) | Effect of H2O on catalytic activity | CO2 content (vol%) | Effect of CO2 on catalytic activity | SO2 content (ppm) | Effect of SO2 on catalytic activity | Ref. |
---|---|---|---|---|---|---|---|---|
Methane | Pd2.41Pt | 2.5 or 5 | catalytically stable | 2.5 or 5 | no significant decline | 100 | dropped sharply | [ |
Methane | 1.14Pd2.8Pt/ 3DOM LMAO | 5 | decreased slightly | 5 | without decline | 100 | decreased significantly | [ |
Methane | 0.44PtPd2.20/ ZrO2 | 10 | decreased significantly | — | — | 100 | decreased significantly | [ |
Methane | 1.93AuPd1.95/3DOM CoCr2O4 | 5 | decreased slightly | — | — | 100 | decreased slightly | [ |
n-Hexane | Co1Ni1/meso-Cr2O3 | 10 | minor negative effect | 5 | not changed distinctly | — | — | [ |
Acetylene | 0.59IrFe0.90/meso-CeO2 | 1 or 5 | no significant changes | 5 | not altered significantly | 50 | decreased significantly | [ |
Benzene | 0.25 Pt1/meso-Fe2O3 | 1 or 3 | enhancement effect | 2.5 | not change obviously | — | — | [ |
Benzene | 0.0383Pt1/OMS-2 | 1.5, 3, or 5 | decreased significantly | 5 | no obvious changes | — | — | [ |
Benzene | TiO2/PdW-S1 | 1 or 5 | almost does not affect | 5 | not change obviously | — | — | [ |
Toluene | 0.28Pd/S-1-H | 2 or 5 | decreased slightly | 5 | decreased slightly | 50 | declined sharply | [ |
Toluene | 0.2 wt% Pt/TiO2 | 2, 5, or 10 | decreased slightly | 2.5, 5, or 10 | weak negative influence | 50 | decreased rapidly | [ |
Toluene | 2.3 wt% Pt/3DOM Mn2O3 | 3 or 5 | decreased slightly | 3 | decreased slightly | 40 | decreased gradually | [ |
Toluene | 0.46PdPt2.10/V2O5-TiO2 | 5 | no significant changes | 5 | no significant decrease | 50 | decreased slightly | [ |
Toluene | 0.37Pt−0.16MnOx/meso-CeO2 | 1, 3 or 5 | no considerable changes | 5 | decreased slightly | — | — | [ |
Toluene | 1.98PtRu@3DOM CZO | 5 | decreased slightly | 10 | no significant changes | 40 | declined considerably | [ |
Methanol | 0.70Pt2.42Co/meso-MnOy | 3 | obviously inhibited | 5 | obviously inhibited | — | — | [ |
Methanol | 0.68Ag0.75Au1.14Pd/meso-Co3O4 | 3 | decreased slightly | 5 | decreased slightly | — | — | [ |
Acetone | 0.57 wt% CeO2-0.05 wt% Pt/TiO2 | 2.5, 5, 10, or 20 | obviously inhibited | 5 or 10 | obviously inhibited | 100 | decreased significantly | [ |
Trichloroethylene | 0.91Au0.51Pd/3DOM TiO2 | 3 or 5 | slight decrease | 5 or 10 | slight decrease | — | — | [ |
Trichloroethylene | 2.85AuPd1.87/3DOM CeO2 | 3 or 5 | slight decrease | 3 or 7 | slight decrease | — | — | [ |
Trichloroethylene | 0.93Ru2.87Pd/3DOM CeO2 | 3 or 5 | obviously inhibited | 5 or 10 | obviously inhibited | — | — | [ |
1,2-Dichloroethane | RuCo/HZSM-5 | 5 | slight decrease | — | — | 100 | marked decline | [ |
1,2-Dichloroethane | Ru/WO3 | 5 | enhancement effect | — | — | — | — | [ |
1,2-Dichloroethane | Ru/TiO2-HPW | 5 | enhancement effect | — | — | — | — | [ |
Toluene | 0.5Pt1/Fe2O3 | 5 or 10 | slight decrease | 5 or 10 | negligible effect | 20 | slight decrease | [ |
Heptane and hexane | Pt/CeO2/TiO2 | 5, 10, or 20 | enhancement effect | — | — | — | — | [ |
Ethyl acetate | 0.26Pd/3.2 N-TiO2 | 5 | enhancement effect | 10 | negligible effect | — | — | [ |
Fig. 21. (a) Schematic diagram of the preparation process of W1/PdO NPs. Effect of H2O content on CH4 conversion and CO2 selectivity over PdW1/Al2O3 (b) and Pd/Al2O3 (c). Reproduced with permission from Ref. [184]. Copyright 2022, Wiley-VCH GmbH.
Fig. 22. (A) CH4 conversion as a function of reaction time over different samples in the absence and presence of H2O. Reproduced with permission from Ref. [51]. Copyright 2017, American Chemical Society. (B) Propane conversion as a function of on-stream reaction time in the presence or absence of CO2 and H2O over PtNPCoNP/meso-NaxMnOy (c), Co1/meso-NaxMnOy (d), Pt1/meso-NaxMnOy (e), and Pt1Co1/meso-NaxMnOy (f). Reproduced with permission from Ref. [55]. Copyright 2022, American Chemical Society. (C) Benzene conversion as a function of on-stream reaction time in the presence or absence of SO2 in Pd/Al2O3 and Pd1Co1/Al2O3. Reproduced with permission from Ref. [62]. Copyright 2020, Elsevier.
Fig. 23. The mechanism of methanol oxidation on Au1Pt1/meso-Fe2O3 and PtNP/meso-Fe2O3 catalysts in the presence of SO2. Reproduced with permission from Ref. [132]. Copyright 2023, Elsevier.
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