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Recyclable and Re-useable Catalysts

A special issue of Molecules (ISSN 1420-3049).

Deadline for manuscript submissions: closed (31 December 2018) | Viewed by 7786

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Assistant Guest Editor
Department of Chemistry, GITAM Institute of Sciences, GITAM University, Visakhapatnam 530045, India
Interests: heterocyclic chemistry; medicinal chemistry; green chemistry; heterogeneous catalysis; advanced oxidation processes
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Special Issue Information

Dear Colleagues,

Growing consciousness of environmental issues has significantly changed the thinking of chemists working in research and design. The resulting green chemistry approach involves reducing and eliminating the generation and use of hazardous substances. Related, sustainable chemistry is of particularly high importance, stimulating the development of clean processes and technologies. It includes waste reduction, minimization of materials and energy, renewability, introduction and use of environmentally-benign reagents and efficient processes. In particular, recycling (that is the reuse of catalysts) is an important issue when considering the limited availability and dwindling supply of expensive noble metals. A long catalyst lifetime and the ability to easily recycle catalysts are highly desirable for industrial applications as well. That is, both environmental and economic considerations force the development of processes that enable the separation and recovery, as well as reuse, of catalysts. In recent years, a wide range of catalyst materials have been developed addressing these problems. Without a doubt, this topic has become a mainstream interest. Consequently, it appears to be useful to compile a Special Issue on catalyst recycling and survey various aspects of this field.

The use of single metal oxides as heterogeneous catalysts has been a partial success, because of their poor efficiency towards desired applications or rapidly-decreasing activity and reusability. The choice of metals and support materials with appropriate characteristics allow the design of mixed oxides to suit specific application needs and recyclability characteristics with little loss in activity. With the advent of multicomponent one-pot reactions (MCRs), mixed oxide composites and supported nano-composites have proved highly efficient and efficacious as catalysts to enable the reactions of many bio-active and pharmaceutically important organic moieties in high yields under moderate reaction conditions, by use of green solvents and short reaction times. Many mixed oxides and their nanocomposites have also been effectively used as catalysts and photo-catalysts for degradation of toxic/refractory pollutants from water systems.

The proposed Special Issue aims to bring together recent advances in the design and fabrication of varied nanomaterials, supports and nanocomposites and their successful application as reusable and recyclable catalysts in varied fields, with an emphasis on sustainability and green principles. The scope of these nanocomposites as recyclable heterogeneous catalysts or photo-catalysts as renewable catalysts certainly fit well into the topic.

Experts working with homogeneous (soluble) metal complexes, heterogenized (immobilized) complexes, solid heterogeneous catalysts and novel nano-composites employed as recyclable and renewable catalysts in varied reactions or industrial processes will have a great opportunity to make their results more visible. Interested readers, in turn, will find a rich source of information on various aspects and current efforts in the field, focusing on major achievements of recent years. Original research papers and reviews encompassing various aspects of recyclable catalysis are welcome.

Prof. Dr. Sreekantha B. Jonnalagadda
Prof. Dr. Árpád Molnár
Guest Editors

Dr. Suresh Maddila
Assistant Guest Editor

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Keywords

  • Heterogeneous catalysts
  • Homogeneous complexes Immobilized catalysts
  • Nano-composites
  • Renewable catalyst sources
  • Magnetic catalysts
  • Supported catalysts
  • Ionic liquids

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Published Papers (2 papers)

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Research

14 pages, 3822 KiB  
Article
Microwave-Assisted Dehydrogenative Cross Coupling Reactions in γ-valerolactone with a Reusable Pd/β-cyclodextrin Crosslinked Catalyst
by Silvia Tabasso, Emanuela Calcio Gaudino, Elisa Acciardo, Maela Manzoli, Agnese Giacomino and Giancarlo Cravotto
Molecules 2019, 24(2), 288; https://doi.org/10.3390/molecules24020288 - 14 Jan 2019
Cited by 17 | Viewed by 3582
Abstract
Transition-metal mediated C–H bond activation and functionalization is one of the most straightforward and powerful tools in modern organic synthetic chemistry. Oxidative C–H/C–H coupling reactions between two (hetero)arenes under heterogeneous catalysis may be a valuable means for the production of a plethora of [...] Read more.
Transition-metal mediated C–H bond activation and functionalization is one of the most straightforward and powerful tools in modern organic synthetic chemistry. Oxidative C–H/C–H coupling reactions between two (hetero)arenes under heterogeneous catalysis may be a valuable means for the production of a plethora of bi(hetero)aryls, and one that adheres to the increasing demand for atom-economic and sustainable chemistry. We have therefore developed a reusable heterogeneous catalytic system, which is based on Pd cross-linked β-cyclodextrin, to perform an efficient microwave-assisted oxidative C–H/C–H cross coupling process between benzothiazoles and methyl thiophene in the presence of green solvents. Full article
(This article belongs to the Special Issue Recyclable and Re-useable Catalysts)
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14 pages, 3965 KiB  
Article
Ag2O on ZrO2 as a Recyclable Catalyst for Multicomponent Synthesis of Indenopyrimidine Derivatives
by Sandeep V. H. S. Bhaskaruni, Suresh Maddila, Werner E. Van Zyl and Sreekantha B. Jonnalagadda
Molecules 2018, 23(7), 1648; https://doi.org/10.3390/molecules23071648 - 5 Jul 2018
Cited by 21 | Viewed by 3520
Abstract
We describe the synthesis of silver loaded on zirconia and its use as an efficient catalyst for a one-pot three-component reaction to synthesize 11 indenopyrimidine derivatives, of which 7 are new compounds. The procedure involves substituted benzaldehydes, indane-1,3-dione, and guanidinium hydrochloride, with ethanol [...] Read more.
We describe the synthesis of silver loaded on zirconia and its use as an efficient catalyst for a one-pot three-component reaction to synthesize 11 indenopyrimidine derivatives, of which 7 are new compounds. The procedure involves substituted benzaldehydes, indane-1,3-dione, and guanidinium hydrochloride, with ethanol as solvent. The proposed green protocol at room temperature is simple and efficient, giving excellent yields (90–96%) in short reaction times (<30 min). The protocol works well according to the green chemistry principles with respect to high atom economy, no need for column separation, and reusability of the catalyst, which are attractive features. XRD, TEM, SEM, and BET analysis were used to characterize the catalyst materials. Full article
(This article belongs to the Special Issue Recyclable and Re-useable Catalysts)
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