N2O catalytic reduction over different porous SiO2 materials functionalized with copper
| Autor: | G. Ortega-Zarzosa, Jonatan Andrade-Martínez, Vicente Rodríguez-González, Antonio Gómez-Cortés |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
General Chemical Engineering Inorganic chemistry chemistry.chemical_element Selective catalytic reduction Copper Physisorption Chemical engineering chemistry Surface modification Science technology and society High-resolution transmission electron microscopy Porosity Mesoporous material |
| Zdroj: | Powder Technology. 274:305-312 |
| ISSN: | 0032-5910 |
| DOI: | 10.1016/j.powtec.2015.01.048 |
| Popis: | A N 2 O reduction study in the presence of CO, used as a scavenging agent, was carried out in order to understand the role played by the SiO 2 morphology and mesoporosity order. Physicochemical properties were characterized by means of low angle X-ray diffraction, N 2 physisorption, FESEM, HRTEM and HAADF microscopies. Highly ordered mesoporous SiO 2 was obtained by the Stober modified method. On the other hand, disordered-pore-amorphous SiO 2 with broad pore-size distribution was synthesized by the sol–gel method. The CuO functionalization of SiO 2 materials was carried out by incipient impregnation using citric acid. The role played by the Cu wt.% during the reduction of the greenhouse gas was examined in the N 2 O reduction. The ordered mesoporosity with a sharp pore size distribution results to be crucial for enhancing the N 2 O reduction from 200 °C; the copper functionalized xerogel and commercial materials started the N 2 O conversion at 350 °C. Low-temperature reduction was exhibited when the CuO functionalization percentage was 10 wt.%, and total conversion was achieved from 200 to 400 °C, also showing good stability for 21 h. CuO—supported on highly ordered mesoporous SiO 2 is comparable with other Rh and Pd systems reported in the literature. |
| Databáze: | OpenAIRE |
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