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Layered double hydroxides (LDHs), also known as two-dimensional anionic clays, as well as the derived materials, including hybrids, nanocomposites, mixed oxides, and supported metals, have been highlighted as outstanding heterogeneous catalysts with unlimited applications in various processes involving both acid–base (addition, alkylation, acylation, decarboxylation, etc.) and redox (oxidation, reduction, dehydrogenation, etc.) mechanisms. This is mainly due to their flexibility in chemical composition, allowing the fine tuning of the nature of the active sites and the control of the balance between them. Additionally, LDHs display a large anion exchange capacity and the possibility to modify their interlayer space, constraining the size and type of reactants entering in the interlamellar space. Furthermore, their easy and economic synthesis, with high levels of purity and efficiency, at both the laboratory and industrial scales, make LDHs and their derived materials excellent solid catalysts. This Special Issue collects original research papers, reviews, and commentaries focused on the catalytic applications of these remarkable materials.

Research & information: general --- Chemistry --- layered double hydroxides (LDH) --- polyoxometalates (POM) --- catalytic materials --- Michael addition --- cobalt-based LDHs --- ultrasonic irradiation --- synergistic effect --- photocatalysis --- nitrophenol degradation --- Zn,Al-hydrotalcite --- ZnO dispersed on alumina --- reusability --- layered double hydroxide --- LDH --- catalytic oxidation --- ethanol --- toluene --- VOC --- photocatalysts --- Cu electrodes --- diazo dyes --- electrocatalysts --- layer double hydroxides --- photoelectrochemical degradation --- hydrotalcites --- mixed oxides --- aldol condensation --- basic catalysts --- exfoliation --- nanosheets --- oxidation --- layered double hydroxides --- base catalysts --- epoxide --- formaldehyde --- oxidation removal --- BiOCl --- manganese --- biodiesel --- transesterification --- hydrothermal --- nickel --- aluminum --- solid base --- structured catalyst --- ethanol steam reforming --- aluminum lathe waste strips --- Ni nanoparticle --- mechano-chemical/co-precipitation synthesis --- organic alkalis (tetramethylammonium hydroxide) --- memory effect --- Claisen-Schmidt condensation --- self-cyclohexanone condensation --- n/a

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Clay minerals are inexpensive and available materials with a wide range of applications (adsorbent, ion exchanger, support, catalyst, paper coating, ceramic, and pharmaceutical applications, among others). Clay minerals can be easily modified through acid/basic treatments, the insertion of bulky ions or pillars into the interlayer spacing, and acid treatment, improving their physicochemical properties.Considering their low cost and high availability, clay minerals display a relatively high specific surface area in such a way that they have a great potential to be used as catalytic supports, since they can disperse expensive active phases as noble metals on the porous structures of their surfaces. In addition, the low cost of these supports allows their implementation on an industrial scale more easily than other supports, which are only feasible at the laboratory scale. Hydrotalcites (considered as anionic or basic clays) are also inexpensive materials with a great potential to be used as catalysts, since their textural properties could also be modified easily through the insertion of anions in their interlayer spacing. In the same way, these hydrotalcites, formed by layered double hydroxides, can lead to their respective mixed oxides after thermal treatment. These mixed oxides are considered basic catalysts with a high surface area, so they can also be used as catalytic support.

propane dehydrogenation --- hierarchical microstructure --- reconstruction --- high selectivity --- excellent durability --- reduction atmosphere --- coke deposition --- meixnerite --- PtIn/Mg(Al)O/ZnO --- layered double hydroxides --- Cu-based catalysts --- Cu/ZnO/Al2O3 --- furfural --- furfuryl alcohol --- n/a --- CuMgFe --- hydrogenolysis of glycerol --- 1,2-propanediol --- recycled --- isobutane dehydrogenation --- MgF2 promoter --- hydrotalcite-derived composites --- supported Pt-In catalysts --- kaolin --- mesoporous --- heterogeneous catalyst --- esterification --- waste valorization

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• Reference Manager
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Clay minerals are inexpensive and available materials with a wide range of applications (adsorbent, ion exchanger, support, catalyst, paper coating, ceramic, and pharmaceutical applications, among others). Clay minerals can be easily modified through acid/basic treatments, the insertion of bulky ions or pillars into the interlayer spacing, and acid treatment, improving their physicochemical properties.Considering their low cost and high availability, clay minerals display a relatively high specific surface area in such a way that they have a great potential to be used as catalytic supports, since they can disperse expensive active phases as noble metals on the porous structures of their surfaces. In addition, the low cost of these supports allows their implementation on an industrial scale more easily than other supports, which are only feasible at the laboratory scale. Hydrotalcites (considered as anionic or basic clays) are also inexpensive materials with a great potential to be used as catalysts, since their textural properties could also be modified easily through the insertion of anions in their interlayer spacing. In the same way, these hydrotalcites, formed by layered double hydroxides, can lead to their respective mixed oxides after thermal treatment. These mixed oxides are considered basic catalysts with a high surface area, so they can also be used as catalytic support.

Research & information: general --- Chemistry --- Inorganic chemistry --- propane dehydrogenation --- hierarchical microstructure --- reconstruction --- high selectivity --- excellent durability --- reduction atmosphere --- coke deposition --- meixnerite --- PtIn/Mg(Al)O/ZnO --- layered double hydroxides --- Cu-based catalysts --- Cu/ZnO/Al2O3 --- furfural --- furfuryl alcohol --- CuMgFe --- hydrogenolysis of glycerol --- 1,2-propanediol --- recycled --- isobutane dehydrogenation --- MgF2 promoter --- hydrotalcite-derived composites --- supported Pt-In catalysts --- kaolin --- mesoporous --- heterogeneous catalyst --- esterification --- waste valorization --- propane dehydrogenation --- hierarchical microstructure --- reconstruction --- high selectivity --- excellent durability --- reduction atmosphere --- coke deposition --- meixnerite --- PtIn/Mg(Al)O/ZnO --- layered double hydroxides --- Cu-based catalysts --- Cu/ZnO/Al2O3 --- furfural --- furfuryl alcohol --- CuMgFe --- hydrogenolysis of glycerol --- 1,2-propanediol --- recycled --- isobutane dehydrogenation --- MgF2 promoter --- hydrotalcite-derived composites --- supported Pt-In catalysts --- kaolin --- mesoporous --- heterogeneous catalyst --- esterification --- waste valorization