Special Issue "Porous Materials and Catalysts"
Deadline for manuscript submissions: 30 September 2020.
Interests: nanostructured materials; sol–gel synthesis; enzyme immobilization; catalysis
Interests: enzyme immobilization; biocatalysis; biofuels; mesoporous silica
Porous materials represent a broad platform for many applications in different fields, such as molecular separation, adsorption, enzyme immobilization, and heterogeneous catalysis. Both micro- and mesoporous materials (zeolites, MOFs, carbon, mesostructured silica, and silica-alumina) attract a great interest for applications in catalysis, thanks to their outstanding properties—mainly due to their large surface area and pore volume. For microporous materials, the size of the pores remains a strong limitation for applications involving bulky substrates or for hosting large biomolecules, as in enzyme immobilization. On the other hand, mesostructured materials possess poor thermal/hydrothermal stability and acid strength. They often require functionalization in order to obtain the required catalytic properties.
The aim of this Special Issue is to open a discussion forum concerning new synthesis and functionalization strategies for preparing catalysts with improved performance. The attention is focused on (but not restricted to) green pathways, both in the preparation of the catalyst and/or in the process to catalyze (i.e., biomass transformation and carbon dioxide conversion).Prof. Dr. Aniello Costantini
Dr. Valeria Califano
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- mesostructured silica
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Immobilization of Cellulolytic Enzymes in Mesostructured Silica Materials
Authors: Valeria Califano, Aniello Costantini
Affiliation: a) Istituto Motori, CNR; b) DICMAPI, University of Naples Federico II.
Abstract: Mesostructured silica nanoparticles offer a unique opportunity in the field of biocatalysis thanks to their outstanding properties. The tuneable pore size in the range of mesopores allows for immobilizing bulky enzyme molecules. The large surface area improves the catalytic efficiency by increasing enzyme loading and finely dispersing the biocatalyst molecules. The easy tuneable pore morphology allows for creating a proper environment to host an enzyme. The confining effect of mesopores can improve the enzyme stability and its resistance to extreme pH and temperatures, due to a limited exposure to environmental factors and to the increased conformational rigidity of the polypeptide chain because of the interactions with the pore walls. Benefits also arise from other peculiarities of nanoparticles such as Brownian motion and easy dispersion. Fossil fuel depletion and environmental pollution have led to the need for alternative sustainable and renewable energy sources such as biofuels. In this contest lignocellulosic biomass has been considered as a strategic fuel source. Cellulases are a class of hydrolytic enzymes that convert cellulose into fermentable sugars. They consist of three enzymes that act sequentially and synergistically on the polymeric chain of cellulose: endo-β-1,4-d-glucanase (EC 220.127.116.11), exo- β-1,4-d-glucanase or cellobiohydrolase (EC 18.104.22.168) and β-Glucosidase (EC 22.214.171.124). The latter is considered to be the bottleneck of the whole process of cellulose conversion since it hydrolyzes cellobiose, a known inhibitor for both endo- and exo-glucanase activities. Furthermore, most cellulases are poor in b-glucosidase and the immobilization of b-glucosidase can be used to supplement them. Additionally, immobilized BG can find applications in other fields (i.e. the release of aromatic residues in the flavour industry and the synthesis of oligosaccharides and glycosides in the pharmaceutical industry). This review is intended to survey the immobilization of cellulolytic enzymes (cellulases and β-Glucosidase) onto mesoporous silica nanoparticles and their catalytic performance, with the aim to give a contribution to the urgent action required against climate change and its impacts, by biorefineries development.
Title: Immobilization of β-glucosidase over structured cordierite monoliths washcoated with wrinkled silica nanoparticles
Authors: Valeria Califano1, Aniello Costantini2, Almerinda Di Benedetto2, Gianluca Landi3, Virginia Venezia2
Affiliation: 1. Istituto Motori-CNR, Naples, 80125, Italy 2. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Naples Federico II Naples, 80125, Italy 3. Institute for Researches on Combustion-CNR, Naples, 80125, Italy