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Zn-Al Mixed Oxides Decorated with Potassium as Catalysts for HT-WGS: Preparation and Properties
| Content Provider | MDPI |
|---|---|
| Author | Wies, ław Próchniak Antoniak-Jurak, Katarzyna Kowalik, Paweł Michalska, Kamila Bicki, Robert |
| Copyright Year | 2020 |
| Description | A set of ex-ZnAl-LDHs catalysts with a molar ratio of Zn/Al in the range of 0.3–1.0 was prepared using co-precipitation and thermal treatment. The samples were characterized using various methods, including X-ray fluorescence spectroscopy (XRF), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy FT-IR, N2 adsorption, Temperature-programmed desorption of CO2 (TPD-CO2) as well as Scanning electron microscopy (SEM-EDS). Catalyst activity and long-term stability measurements were carried out in a high-temperature water–gas shift (HT-WGS) reaction. Mixed oxide catalysts with various Zn/Al molar ratios decorated with potassium showed high activity in the HT-WGS reaction within the temperature range of 330–400 °C. The highest activity was found for the Zn/Al molar ratio of 0.5 corresponding to spinel stoichiometry. However, the catalyst with a stoichiometric spinel molar ratio of Zn/Al (ZnAl_0.5_K) revealed a higher tendency for surface migration and/or vaporization of potassium during overheating at 450 °C. The correlation of the activity results and TPD-CO2 data show that medium basic sites enhance the progress of the HT-WGS reaction. |
| Starting Page | 1094 |
| e-ISSN | 20734344 |
| DOI | 10.3390/catal10091094 |
| Journal | Catalysts |
| Issue Number | 9 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-09-21 |
| Access Restriction | Open |
| Subject Keyword | Catalysts Applied Chemistry Layered Double Hydroxides Mixed Oxides Spinel Structure Potassium Promoter Water Gas Shift |
| Content Type | Text |
| Resource Type | Article |
