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Hollow @CuMgAl double layered hydrotalcites and mixed oxides with tunable textural and structural properties, and thus enhanced NH3-NOx-SCR activity
Authors: Kondratowicz Tomasz Stanisław | Horký Ondřej | Šlang Stanislav | Dubnová Lada | Gajewska Marta | Chmielarz Lucjan | Čapek Libor
Year: 2023
Type of publication: článek v odborném periodiku
Name of source: Nanoscale Advances
Publisher name: Royal Society of Chemistry
Place: Cambridge
Page from-to: 3063-3074
Titles:
Language Name Abstract Keywords
cze Duté @CuMgAl dvouvrstvé hydrotalcity a směsné oxidy s laditelnými texturními a strukturními vlastnostmi, a tedy zvýšenou aktivitou NH3-NOx-SCR Dobře organizované, sférické, mezoporézní duté @CuMgAl-LDH (vrstvené podvojné hydroxidy) byly připraveny řízeným odstraňováním Si02 z hybridů Si02@CuMgAl-LDH. Materiály bylůy připraveny s různými molárními poměry Cu/Mg (Cu/Mg = 0,05-0,50) při zachování konstantního poměru (Cu+Mg)/Al = 2. Studie popisuje účinek dopování mědí a odstranění jádra oxidu křemičitého na chemické složení, morfologii, strukturu, texturu a redukovatelnost výsledných materiálů. selextivní katalytická redukce; podvojné hydroxidy; hydrotalcit; Cu-Mg-Al
eng Hollow @CuMgAl double layered hydrotalcites and mixed oxides with tunable textural and structural properties, and thus enhanced NH3-NOx-SCR activity Well-organized, spherical, mesoporous hollow @CuMgAl-LDHs (layered double hydroxides) are prepared by the controlled removal of the SiO2 from SiO2@CuMgAl-LDH core-shell hybrids that in turn are synthesized via a bottom-up strategy. The materials are prepared with various Cu/Mg molar ratios (Cu/Mg = 0.05-0.50) while keeping the ratio of Cu and Mg constant, (Cu + Mg)/Al = 2. The effect of Cu doping and the silica core removal process (conducted for 4 h at 30 degrees C using 1 M NaOH) on the chemical composition, morphology, structure, texture and reducibility of the resulting materials are described. @CuMgAl-MOs (mixed oxides) obtained by thermal treatment of the @CuMgAl-LDHs are active and selective catalysts for the selective catalytic reduction of NOx using ammonia, and effectively operate at low temperatures. The N-2 yield increases with increased Cu content in the CuMgAl shell, which is associated with the easier reducibility of the Cu species incorporated into the MgAl matrix. @CuMgAl-MOs show better catalytic performance than bulk CuMgAl MOs. selective catalytic-reduction; cu-mg-al; double hydroxide; facile synthesis; efficient removal; oxidation; copper; no; nh3-scr; metal

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