New mesoporous magnesium–aluminum mixed oxide and its catalytic activity in liquid phase Baeyer–Villiger oxidation reaction

Recent Developments on the Catalytic and Biosensing Applications of Porous Nanomaterials

Nanoscopic materials have demonstrated a versatile role in almost every emerging field of research. Nanomaterials have come to be one of the most important fields of advanced research today due to its controllable particle size in the nanoscale range, capacity to adopt diverse forms and morphologies, high surface area, and involvement of transition and non-transition metals. With the introduction of porosity, nanomaterials have become a more promising candidate than their bulk counterparts in catalysis, biomedicine, drug delivery, and other areas. This review intends to compile a self-contained set of papers related to new synthesis methods and versatile applications of porous nanomaterials that can give a realistic picture of current state-of-the-art research, especially for catalysis and sensor area. Especially, we cover various surface functionalization strategies by improving accessibility and mass transfer limitation of catalytic applications for wide variety of materials, including organic and inorganic materials (metals/metal oxides) with covalent porous organic (COFs) and inorganic (silica/carbon) frameworks, constituting solid backgrounds on porous materials.

Three-Dimensional Hierarchical Hydrotalcite–Silica Sphere Composites as Catalysts for Baeyer–Villiger Oxidation Reactions Using Hydrogen Peroxide

The development of effective, environmentally friendly catalysts for the Baeyer–Villiger reaction is becoming increasingly important in applied catalysis. In this work, we synthesized a 3D composite consisting of silica spheres coated with Mg/Al hydrotalcite with much better textural properties than its 2D counterparts. In fact, the 3D solid outperformed a 2D-layered hydrotalcite as catalyst in the Baeyer–Villiger reaction of cyclic ketones with H2O2/benzonitrile as oxidant. The 3D catalyst provided excellent conversion and selectivity; it was also readily filtered off the reaction mixture. The proposed reaction mechanism, which involves adsorption of the reactants on the hydrotalcite surface, is consistent with the catalytic activity results.

Nanoporous metal oxide composite materials: A journey from the past, present to future

Along with the progress of porous metal oxides, the development of multi-metal oxide composite materials have received a significant attention in the last few decades owing to the interesting physical and chemical properties of the hybrid oxide nanostructures. Consequently, a large number of national and international articles, communications etc. related to these oxide composites have come to light. This review conveys a comprehensive overview of those nanoporous metal oxide composites, illustrating various synthetic pathways and formation mechanisms for composite oxides based on template and non-templated routes. Also, characteristic properties of the synthesized materials analyzed using various techniques have been discussed systematically here. Moreover, the current review will also focus on a thorough literature survey of significant potential applications of these oxide composites in different fields including catalysis, biosensing, adsorption, energy conversion, toxic chemical removal, solar cell etc. demonstrating the impact of the metal compositions, nanostructures on the performances of the materials. Finally, a brief perspective is mentioned indicating the future prospects of these porous composites. Though, the scope of this review is limited to porous metal oxide composites, the information presented here can be helpful for any researchers working in other emerging fields.

Rearrangements of organic peroxides and related processes

This review is the first to collate and summarize main data on named and unnamed rearrangement reactions of peroxides. It should be noted, that in the chemistry of peroxides two types of processes are considered under the term rearrangements. These are conventional rearrangements occurring with the retention of the molecular weight and transformations of one of the peroxide moieties after O-O-bond cleavage. Detailed information about the Baeyer-Villiger, Criegee, Hock, Kornblum-DeLaMare, Dakin, Elbs, Schenck, Smith, Wieland, and Story reactions is given. Unnamed rearrangements of organic peroxides and related processes are also analyzed. The rearrangements and related processes of important natural and synthetic peroxides are discussed separately.

Mesoporous materials: versatile supports in heterogeneous catalysis for liquid phase catalytic transformations

This review article provides an overview of recently reported liquid phase heterogeneous catalytic reactions performed over mesoporous materials, along with their different synthesis strategies and critical role in environment-friendly green catalysis.

The dual role of micelles as templates and reducing agents for the fabrication of catalytically active hollow silver nanospheres

A simple and efficient protocol for fabrication of colloidal hollow Ag nanospheres of size less than 30 nm using a triblock copolymer in the absence of any reducing agent is reported, which showed excellent catalytic activity in the Baeyer–Villiger oxidation reaction.

Design and fabrication of mesoporous heterogeneous basic catalysts

Recent advances in mesoporous solid bases were reviewed, and fundamental principles of how to fabricate efficient basic catalysts were highlighted.