Catalytic applications of layered double hydroxides: recent advances and perspectives

Abstract

This review surveys recent advances in the applications of layered double hydroxides (LDHs) in heterogeneous catalysis. By virtue of the flexible tunability and uniform distribution of metal cations in the brucite-like layers and the facile exchangeability of intercalated anions, LDHs-both as directly prepared or after thermal treatment and/or reduction-have found many applications as stable and recyclable heterogeneous catalysts or catalyst supports for a variety of reactions with high industrial and academic importance. A major challenge in this rapidly growing field is to simultaneously improve the activity, selectivity and stability of these LDH-based materials by developing ways of tailoring the electronic structure of the catalysts and supports. Therefore, this Review article is mainly focused on the most recent developments in smart design strategies for LDH materials and the potential catalytic applications of the resulting materials.

A highly-efficient oxygen evolution electrode based on defective nickel-iron layered double hydroxide

“…In recent decades, layered double hydroxide (LDH), highly tunable layered materials with brucite-like layers and intercalated anions, have been widely considered as promising OER electrode material [26][27][28]. Extensive efforts have been made to improve the OER activity of NiFe LDHs by tuning their chemical composition/nanostructures or enhancing the electrical conductivity [29][30][31][32].…”

Graphene-oxide-supported CuAl and CoAl layered double hydroxides as enhanced catalysts for carbon-carbon coupling via Ullmann reaction

“…In particular, LDHs have been intensively investigated in recent years as catalysts and catalyst supports [4,5] in many aspects, such as organic synthesis, (photo) degradation of organic wastes, greenhouse gas control emission and H2 production [6][7][8][9][10][11][12][13].…”

Polyoxometalate (POM)-Layered Double Hydroxides (LDH) Composite Materials: Design and Catalytic Applications

“…Layered double hydroxides (LDHs) or hydrotalcite-like compounds are a large family of two-dimensional (2D) anionic clay materials made up of positively charged brucite-like layers with an interlayer region containing charge compensating anions and solvation molecules, which can be represented by the general formula [M 1 and generally in the range of 0.20-0.33, which occupy the space between the layers compensating for the positive charge and inducing stability in the overall structure [5,6]. The M II /M III -based edge shared octahedra are used to construct 2D infinite sheets, whereas hydroxyl groups are organized on the vertices of the octahedra with the hydrogen atoms pointing toward the interlayer region, as a consequence forming a complex network of hydrogen bonds with the interlayer anions and water molecules [1,[7][8][9][10].…”

“…The M II /M III -based edge shared octahedra are used to construct 2D infinite sheets, whereas hydroxyl groups are organized on the vertices of the octahedra with the hydrogen atoms pointing toward the interlayer region, as a consequence forming a complex network of hydrogen bonds with the interlayer anions and water molecules [1,[7][8][9][10]. LDH-based materials are very attractive systems due to their robust structure,…”