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Catalysts
Special Issues
Zn-based Catalysts for Chemical and Fuel Conversions
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Zn-based Catalysts for Chemical and Fuel Conversions

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (30 June 2019) | Viewed by 13260

Special Issue Editor

Dr. Victor Abdelsayed

E-Mail Website
Guest Editor
National Energy Technology Laboratory, Morgantown, WV, USA
Interests: coal and natural gas conversions; CO/CO2 hydrogenation; BTX by dehydroaromatization reactions; CO2/NOX reduction, dry and steam reforming

Special Issue Information

Dear Colleagues,

It has become increasingly important to reduce the world’s dependency on oil and secure its future energy. This would require an efficient and economically feasible conversion of coal and natural gas into chemicals. These chemical conversions require robust, active, and selective catalysts that could convert these fuels either directly, by a non-oxidative route, or indirectly, by an oxidative route, into valuable chemicals. Understanding the relationship between structure and reactivity of a catalyst is essential for developing new catalysts.

The goal of this Special Issue is to explore the recent work on Zn-based heterogenous catalysis in the field of CO/CO2 hydrogenation, dehydroaromatization of natural gas, reduction of CO2/NOx and control of their emissions, CO2-fixation into epoxides and other chemical process. Submissions in the form of original research papers, reviews, and short communications are encouraged to this Special Issue on “Zn-based Catalysts for Chemical and Fuel Conversions”.

Dr. Victor Abdelsayed
Guest Editor

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 submissions that pass pre-check are 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 2700 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.

Keywords

  • Reduction of CO2 to CO
  • Hydrogenation of CO2 to methanol
  • CO hydrogenation to higher alcohol synthesis
  • Methane dehydroaromatization to aromatics
  • Organic carbonates by CO2 fixation reactions
  • Methanation reactions
  • Dry and steam reforming
  • Water–gas shift
  • Chemical and fuel conversions

Published Papers (1 paper)

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Review

22 pages, 3221 KiB  
Review
Zinc-Based Curing Activators: New Trends for Reducing Zinc Content in Rubber Vulcanization Process
by Silvia Mostoni, Paola Milana, Barbara Di Credico, Massimiliano D’Arienzo and Roberto Scotti
Catalysts 2019, 9(8), 664; https://doi.org/10.3390/catal9080664 - 2 Aug 2019
Cited by 77 | Viewed by 12666
Abstract
The efficiency of sulfur vulcanization reaction in rubber industry is generally improved thanks to the combined use of accelerators (as sulphenamides), activators (inorganic oxides), and co-activators (fatty acids). The interaction among these species is responsible for the formation of intermediate metal complexes, which [...] Read more.
The efficiency of sulfur vulcanization reaction in rubber industry is generally improved thanks to the combined use of accelerators (as sulphenamides), activators (inorganic oxides), and co-activators (fatty acids). The interaction among these species is responsible for the formation of intermediate metal complexes, which are able to increase the reactivity of sulfur towards the polymer and to promote the chemical cross-links between the rubber chains. The high number of species and reactions that are involved contemporarily in the process hinders the complete understanding of its mechanism despite the long history of vulcanization. In this process, ZnO is considered to be the most efficient and major employed activator and zinc-based complexes that formed during the first steps of the reaction are recognized to play a main role in determining both the kinetic and the nature of the cross-linked products. However, the low affinity of ZnO towards the rubber entails its high consumption (3–5 parts per hundred, phr) to achieve a good distribution in the matrix, leading to a possible zinc leaching in the environment during the life cycle of rubber products (i.e., tires). Thanks to the recent recognition of ZnO ecotoxicity, especially towards the aquatic environment, these aspects gain a critical importance in view of the urgent need to reduce or possibly substitute the ZnO employed in rubber vulcanization. In this review, the reactivity of ZnO as curing activator and its role in the vulcanization mechanism are highlighted and deeply discussed. A complete overview of the recent strategies that have been proposed in the literature to improve the vulcanization efficiency by reducing the amount of zinc that is used in the process is also reported. Full article
(This article belongs to the Special Issue Zn-based Catalysts for Chemical and Fuel Conversions)
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