A kinetic and mechanistic study into the formation of the Cu-Cr layered double hydroxide.

摘要: The formation of the layered double hydroxide [Cu2Cr(OH)6]Cl·yH2O from reaction between CuO and aqueous CrCl3·6H2O was explored using synchrotron X-ray diffraction ex situ analyses. use hard X-rays permitted time-resolved in studies to be performed as proceeded under a range conditions. Additional information obtained experiments which aliquots mixture were removed, quenched, subsequently analysed by laboratory diffraction, IR, UV-visible, atomic emission spectroscopies. On basis these data, it is proposed that involves three steps. First, solid starting material hydrolysed give Cu(OH)2 chains, releasing Cu2+ ions into solution. Cu chains condense with Cr3+ species, Cl− water molecules hydrated form LDH. This then extrudes some phase reduced interlayer spacing.