N2O catalytic reduction over different porous SiO2 materials functionalized with copper
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A N2O reduction study in the presence of CO, used as a scavenging agent, was carried out in order to understand the role played by the SiO2 morphology and mesoporosity order. Physicochemical properties were characterized by means of low angle X-ray diffraction, N2 physisorption, FESEM, HRTEM and HAADF microscopies. Highly ordered mesoporous SiO2 was obtained by the Stöber modified method. On the other hand, disordered-pore-amorphous SiO2 with broad pore-size distribution was synthesized by the sol-gel method. The CuO functionalization of SiO2 materials was carried out by incipient impregnation using citric acid. The role played by the Cu wt.%25 during the reduction of the greenhouse gas was examined in the N2O reduction. The ordered mesoporosity with a sharp pore size distribution results to be crucial for enhancing the N2O reduction from 200°C; the copper functionalized xerogel and commercial materials started the N2O conversion at 350°C. Low-temperature reduction was exhibited when the CuO functionalization percentage was 10wt.%25, and total conversion was achieved from 200 to 400°C, also showing good stability for 21h. CuO-supported on highly ordered mesoporous SiO2 is comparable with other Rh and Pd systems reported in the literature. © 2015 Elsevier B.V.
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CuO-functionalized SiO2; Nitrous oxide reduction; Ordered mesoporous materials; Porous SiO2; Stöber modified method Copper; Greenhouse gases; Nitrogen oxides; Pore size; Size distribution; Sol-gel process; Sol-gels; Temperature; X ray diffraction; Functionalized; Incipient impregnation; Low-angle X ray diffraction; Low-temperature reduction; Nitrous oxide; Ordered mesoporous materials; Physicochemical property; Porous SiO; Mesoporous materials; citric acid; copper oxide nanoparticle; nanoparticle; nitrous oxide; silicon dioxide; unclassified drug; adsorption; Article; catalysis; catalyst; chemical analysis; energy dispersive X ray spectroscopy; field emission scanning electron microscopy; greenhouse gas; high angle annular dark field microscopy; high resolution transmission electron microscopy; low temperature; mesoporosity; microscopy; particle size; physical chemistry; physisorption; porosity; sol gel method; spectroscopy; Stober modified method; synthesis; X ray powder diffraction
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