By use of anion-exchangeable ability of layered Ni-Zn hydroxy double salt (NiZn), unstable anionic transition metal complexes such as [Pd(OH)₄]²⁻, [(D-val)Pd(OH)₂]⁻, or [Rh(OH)₆]³⁻ are able to be intercalated into NiZn interlayer under mild reaction conditions. Catalytically active species in interlayer are stabilized by the strong electrostatic interaction between the NiZn host and the guest anion. Furthermore, Brønsted basic anions such as PO₄³⁻ or OH⁻ were also able to be integrated into NiZn interlayer. These “intercalation catalysts” promote various liquid phase reactions more effectively.

The CuO-CuAl₂O₄ nanocomposite synthesized by high temperature calcination (1073 K) of Cu-Al layered double hydroxide (CuAl LDH) acted as an effective heterogeneous catalyst for selective hydrogenation of carbonyl compounds with formic acid as a hydrogen donor and acceptorless dehydrogenation of various alcohols. The catalytically active Cu⁰ species was formed by in situ reduction. The catalytic activity strongly depended on the Cu/Al ratio in preparation.

Silica-based adsorbents impregnated tetra-n-butyl thiuram disulfide (TBTDS) or tetrakis (2-ethylhexyl) thiuram disulfide (T(2EH)TDS) as extractants on a macroporous silica/polymer composite support (SiO₂-P) were prepared to separate barium (Ba) ions from strontium (Sr) ions present in mixed solutions. The Ba and Sr ion adsorption behaviors of each adsorbent were investigating by varying acid concentration, contact time, temperature, and metal concentrations in solution using the batch method. The Ba and Sr adsorption affinities depended on nitric acid concentration, and the difference in distribution coefficient (K_d) between the two ions was maximum in 1 M HNO₃. Furthermore, results indicated that the adsorption reaction starts several hours after the initial solution–adsorbent contact and reaches equilibrium within 4–10 hours. The dependence for thermal for adsorption indicated to be spontaneous processes. The adsorption mechanisms were investigated by applying two isotherm models. The shapes of the isotherms were different between the TBTDS adsorbent and the T(2EH)TDS adsorbents. The isotherm for the two T(2EH)TDS adsorbents were well fitted by the Langmuir model, but that for TBTDS was S-shaped and more metal ions were adsorbed than the other adsorbents. These results suggest that the Ba and Sr ions could be separated from each other via the batch method using these adsorbents.