Preparation And Properties Of Layered Double Hydroxides

Layered double hydroxides (short for LDHs) is a large class of promising anionic clays. After calcinations, the materials have larger specific surface areas, stronger alkalescence and more surface activated points, with widespread applications in catalytical reactions, catalysis supporters and even adsorption for NO_x.In this paper, Zn/Ni/Mg/Al-LDHs and Cu/Co/Mg/Al-LDHs are prepared by co-precipitation, characterized through element analysis, XRD, IR and N₂ adsorption-desorption, and additionally examined for their capacities for NO_x for the first time. Among the materials, Cu_1.13Co_1.07Mg_0.94Al-LDOs and ZnNi_1.02MgAl-LDOs show excellent performance in NO_x deduction whose capacities for NO_x are 2.8g/g and 2.3g/g, with BET areas of 150.85m²/g and 159m²/g separately. Supported by XRD, IR and SEM results, the mechanism is proposed that those adsorbed NO_x is transformed into NO_x by surface activated points on LDOs, then restructures the LDOs into NO₃^- -type LDHs in the proper...