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Characterization of Electrochemically Deposited Ce 1-x Zr x O 2 Layers Modified with Cobalt Oxide for Electrocatalytic Conversion of NO x and CO
| Content Provider | Semantic Scholar |
|---|---|
| Author | Iliev, Plamen Stefanov, Plamen Stoychev, Dimitar Kaishev, R. |
| Copyright Year | 2014 |
| Abstract | In the last few decades, a significant increase in NOx and CO emissions has been observed. These pollutant gas emissions are mostly the result of combustion processes in motor vehicles, as well as industrial and energy sector processes. In these processes, NOx and CO may be released as a mixture or as separate gases.1–5 Several catalytic methods have been developed for NOx reduction. 6 Direct decomposition is a simple and desirable way of removing NOx, as no reducing agents or changes in driving cycles are required. This approach has been realized via electrochemical removal of NOx. 7 The electrodes employed in the electrochemical reduction of NO and oxidation of CO are usually noble transition metals, since they are very active catalysts.8–11 In this communication, we present our results regarding the use of non-precious metal electrodes for both NOx reduction and CO oxidation in a gas diffusion electrode (GDE). The investigated catalytic systems were obtained by electrochemical deposition of a Ce1−xZrxO2 layer on a stainless steel (SS 1.4301) mesh substrate, and then applying (again by electrochemical deposition) a second layer of cobalt oxide (СoxOy). Thus, the obtained catalytic systems were incorporated into hydrophobic GDEs.12 We have chosen this approach and the combination of electrochemically deposited carrier and active phase layers, because the mixed oxide Ce1−xZrxO2 is known to have high adsorption capacity with regard to NOx due to the numerous centres of alkaline nature on its surface.13 Furthermore, the additional cobalt oxide film over the Ce1−xZrxO2 layer is characterized by high activity in the catalytic reactions of NOx-reduction 14 and CO-oxidation,15–17 as well as removal of volatile organic compounds18–20 because of the presence of mobile oxygen, i.e., unsupported cobalt oxide is an active catalyst in air pollution control for the abatement of CO and NOx. 21 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://hrcak.srce.hr/file/189069 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
