Progress on layered hydrotalcite (HT) materials as potential support and catalytic materials

Abstract

The present review is focused on a recent development in the preparation of various layered hydrotalcites and their applications in environmental, catalytic and supported materials.

Recent advances on the utilization of layered double hydroxides (LDHs) and related heterogeneous catalysts in a lignocellulosic-feedstock biorefinery scheme

“…Moreover, the electrostatic interactions between LDH layers and catalytically active anions can induce an ordered arrangement of interlayer species and tailor the orientation of the active sites. 30,76 These two methodologies used to introduce reducible cations (mainly divalent transition metals) into the structure of LDHs are schematized in Fig. 5, where the preparation of the targeted metal-supported catalyst would require the additional reduction step of the desired catalytic species either by chemical or by thermal treatments.…”

Zinc influence on the formation and properties of Pt/Mg(Zn)AlO catalysts synthesized from layered hydroxides

“…The catalytic application of these materials is related to the synthesis of multicomponent catalysts for aldol condensation, alkylation, polymerization, hydrogenation, steam reforming and other reactions [7][8][9][10]. The main advantages of LDH as catalyst precursors list the possibility to use various cationic pairs in the formation of a layered structure and hence the synthesis of materials with different controllable properties; the distribution of cations in the LDH structure at the atomic level, which prevents their significant segregation during further treatments; and the formation of mixed oxides with a developed surface area upon decomposition of LDH.…”

Synergistic Catalytic Oxidation of Ethylbenzene to Acetophenone by Metallophthalocyanine Intercalated Layered Double Hydroxide with Oxygen

“…On the basis of the above reported results, we envisioned that development of bifunctional catalyst possessing basicity originated from metallophthalocyanine should be interesting. Layered double hydroxide (LDH) is a typical basic material with hydrotalcite structure, and the anions in the interlayers can be adjusted . In this context, intercalation of metallophthalocyanine into LDHs might provide an efficient bifunctional catalyst for the aerobic oxidation ethylbenzene, because synergistic effect might exist between the surface basicity of the hybrid and the activity of the intercalated metallophthalocyanine molecule.…”