Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas
Abstract
:1. Introduction
2. Experimental and Material
2.1. Catalysts Preparation
2.2. Catalyst Characterization
2.3. Apparatus and Methods
3. Results and Discussion
3.1. Catalytic Activity Analysis
3.2. Textural Properties
3.3. Surface Properties
3.4. FTIR Spectra and H2-TPR Analysis
3.5. Proposed Reaction Mechanism Analysis
4. Conclusions
- (1)
- The catalytic activity of Ce-V-Ti catalysts was improved significantly after modification with GO. The CB conversion over Ce-V-Ti/GO catalysts achieved 60% at 100 °C and 80% at 150 °C, which showed excellent catalytic activity at low temperature.
- (2)
- After being modified with GO, the specific surface area and adsorb ability of CB were both enhanced. The concentration of Ce3+ and V4+ on the surface was enlarged, which corresponded with oxygen vacancies. Moreover, the adsorption mode could be changed from a vertical adsorption mode to a parallel adsorption mode by interaction of π-π bonds between CB and GO.
- (3)
- Ce played a major catalytic role and V acted as a co-catalytic composition during catalytic combustion. The chemical interaction between Ce and Ti could improve the amount of oxygen vacancies and Ce3+ ions. V3+ could help to promote the reduction reaction.
Author Contributions
Funding
Conflicts of Interest
References
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Samples | C150 °C | T90 | Reaction Condition | Ref. |
---|---|---|---|---|
Ce0.5Ti0.5 | 0% | 375 °C | 1000 ppm CB; 10% O2/N2; GHSV = 30,000 h−1 | [22] |
Cr0.75Ce0.25/Ti | 20% | 225 °C | 500 ppm CB; GHSV = 20,000 h−1 | [23] |
Mn6Co2Ce2 | 20% | 325 °C | 500 ppm CB; GHSV = 15,000 h−1 | [24] |
Ru (1%)/TiO2-CeO2 | 5% | 225 °C | 550 ppm CB; GHSV = 15,000 h−1 | [25] |
VOx (2.1%)/CeO2 | 5% | 225 °C | 1000 ppm CB; GHSV = 30,000 h−1 | [26] |
Cu0.15Mn0.15Ce0.7Ox | 2% | 255 °C | 600 ppm CB; 21%O/N2; GHSV = 30,000 h−1 | [27] |
Mn (0.86)-CeLa | 20% | 250 °C | 1000 ppm CB; 10%O/N2; GHSV = 15,000 h−1 | [28] |
MnOX (0.86)-CeO2 | 20% | 236 °C | 1000 ppm CB; 10%O/N2; GHSV = 15,000 h−1 | [29] |
Sample | Surface Area (m2/g) a | Total Pore (cm3/g) b | Average Pore (nm) c |
---|---|---|---|
Ce-V-Ti/GO(0.7) | 123.8 | 0.15 | 6.4 |
Ce-V-Ti | 95.7 | 0.29 | 6.5 |
Sample | Atomic (%) | |||||||
---|---|---|---|---|---|---|---|---|
Ce | V | O | C | Ce | O | |||
Ce3+ | Ce4+ | Oα | Oβ | |||||
Ce-V-Ti | 5.56 | 0.91 | 63.44 | 20 | 80 | 88 | 12 | |
Ce-V-Ti/GO(0.7) | 6.96 | 1.01 | 65.82 | 1.66 | 30 | 70 | 53 | 47 |
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Shi, Q.; Ding, L.; Long, H.-M.; Chun, T.-J. Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas. Materials 2020, 13, 125. https://doi.org/10.3390/ma13010125
Shi Q, Ding L, Long H-M, Chun T-J. Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas. Materials. 2020; 13(1):125. https://doi.org/10.3390/ma13010125
Chicago/Turabian StyleShi, Qi, Long Ding, Hong-Ming Long, and Tie-Jun Chun. 2020. "Study of Catalytic Combustion of Dioxins on Ce-V-Ti Catalysts Modified by Graphene Oxide in Simulating Iron Ore Sintering Flue Gas" Materials 13, no. 1: 125. https://doi.org/10.3390/ma13010125