In situkinetics studies of Zn-Al LDH intercalation with corrosion related species
authors Iuzviuk, MH; Bouali, AC; Serdechnova, M; Yasakau, KA; Wieland, DCF; Dovzhenko, G; Mikhailau, A; Blawert, C; Zobkalo, IA; Ferreira, MGS; Zheludkevich, ML
nationality International
journal PHYSICAL CHEMISTRY CHEMICAL PHYSICS
keywords LAYERED DOUBLE HYDROXIDES; CRYSTAL-STRUCTURE; PHASE-CHANGE; HYDROTALCITE; ANIONS; RESISTANCE; CONVERSION; NANOSHEETS; CATALYSTS; KINETICS
abstract Kinetic parameters for three anion exchange reactions - Zn-LDH-NO3 -> Zn-LDH-Cl, Zn-LDH-NO3 -> Zn-LDH-SO(4)and Zn-LDH-NO3 -> Zn-LDH-VOx- were obtained byin situsynchrotron study. The first and the second ones are two-stage reactions; the first stage is characterized by the two-dimensional diffusion-controlled reaction following deceleratory nucleation and the second stage is a one-dimensional diffusion-controlled reaction also with a decelerator nucleation effect. In the case of exchange NO3--> Cl(-)host anions are completely released, while in the case of NO3--> SO(4)(2-)the reaction ends without complete release of nitrate anions. The exchange of Zn-LDH-NO3 -> Zn-LDH-VO(x)is a one-stage reaction and goes much slower than the previous two cases. The latter is characterized by a one stage two-dimensional reaction with an instantaneous nucleation. As a result, at the end of this process there are two crystalline phases with different polyvanadate species, presumably V(4)O(12)(4-)and V2O74-, nitrate anions were not completely released. The rate of replacing NO(3)(-)anions by guest ones can be represented as Cl-> SO42-> VOxy-.
publisher ROYAL SOC CHEMISTRY
issn 1463-9076
isbn 1463-9084
year published 2020
volume 22
issue 31
beginning page 17574
ending page 17586
digital object identifier (doi) 10.1039/d0cp01765e
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000560847500011
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