Copper–Cerium–Tin Oxide Catalysts for Preferential Oxidation of CO in Hydrogen: Effects of Synthesis Method and Copper Content
Abstract
:1. Introduction
2. Results
2.1. Catalytic Performance in CO-PROX
2.2. Physicochemical Characterization of Catalysts Synthesized by Different Techniques
2.3. Effect of Copper Content on Physicochemical Properties of Catalysts
3. Discussion
4. Materials and Methods
4.1. Catalysts Preparation
4.2. Catalysts Characterization
4.3. Catalytic Tests
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Sample Availability
References
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Sample | SBET, m2/g | Average CeO2 Crystallite Size, nm | XPS Atomic and Ion Ratios | H2 Uptake, μmol/g | ||||
---|---|---|---|---|---|---|---|---|
Ce/Cu | Ce/Sn(Zr) | Ce3+/Ce4+ | Cu+/Cu2+ | Low T Range (80–400 °C) | Medium T Range (400–650 °C) | |||
20CuCeSn | 149 ± 15 | 5 ± 1 | 5.8 | 6.3 | 0.11 | 0.70 | 1479 | 100 |
20CuCeZr | 28 ± 3 | 10 ± 1 | 4.0 | 9.7 | 0.11 | 0.20 | 1417 | 159 |
20CuCeSn-im | 81 ± 8 | 12 ± 1 | 2.9 | 20.0 | 0.04 | 0.18 | 1248 | 85 |
20CuCeZr-im | 27 ± 3 | 15 ± 1 | 2.2 | 10.3 | 0.07 | 0.39 | 933 | 136 |
Sample | AAS Copper Content, wt.% | SBET, m2/g | SEM-EDX Atomic Ratio | XPS Atomic and Ion Ratios | ||
---|---|---|---|---|---|---|
Ce/Cu | Ce/Cu | Ce3+/Ce4+ | Cu+/Cu2+ | |||
5CuCeSn | 1.8 | 145 ± 15 | 24.0 | 20.6 | 0.27 | 0.72 |
10CuCeSn | 3.4 | 183 ± 18 | 12.0 | 13.0 | 0.22 | 1.08 |
20CuCeSn | 6.1 | 149 ± 15 | 5.6 | 5.8 | 0.11 | 0.70 |
25CuCeSn | 7.5 | 155 ± 16 | 5.2 | 4.5 | 0.11 | 0.81 |
Sample | Hydrogen Uptake, μmol/g | ∆Tαβ 1, °C | H2/Cu, mol. Ratio (from AAS) 2 | ||
---|---|---|---|---|---|
Low-Temperature Range (80−400 °C) | Medium-Temperature Range (400−650 °C) | Total | |||
5CuCeSn | 977 | 92 | 1069 | 70 | 3.7 |
10CuCeSn | 1213 | 242 | 1455 | 76 | 2.8 |
20CuCeSn | 1479 | 100 | 1579 | 100 | 1.9 |
25CuCeSn | 1697 | 105 | 1802 | 113 | 1.8 |
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Kaplin, I.Y.; Lokteva, E.S.; Tikhonov, A.V.; Maslakov, K.I.; Isaikina, O.Y.; Golubina, E.V. Copper–Cerium–Tin Oxide Catalysts for Preferential Oxidation of CO in Hydrogen: Effects of Synthesis Method and Copper Content. Catalysts 2022, 12, 1575. https://doi.org/10.3390/catal12121575
Kaplin IY, Lokteva ES, Tikhonov AV, Maslakov KI, Isaikina OY, Golubina EV. Copper–Cerium–Tin Oxide Catalysts for Preferential Oxidation of CO in Hydrogen: Effects of Synthesis Method and Copper Content. Catalysts. 2022; 12(12):1575. https://doi.org/10.3390/catal12121575
Chicago/Turabian StyleKaplin, Igor Yu., Ekaterina S. Lokteva, Artem V. Tikhonov, Konstantin I. Maslakov, Oksana Ya. Isaikina, and Elena V. Golubina. 2022. "Copper–Cerium–Tin Oxide Catalysts for Preferential Oxidation of CO in Hydrogen: Effects of Synthesis Method and Copper Content" Catalysts 12, no. 12: 1575. https://doi.org/10.3390/catal12121575