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Molecular Sieving and Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Porous Materials".

Deadline for manuscript submissions: closed (31 August 2013) | Viewed by 7662

Special Issue Editor

Department of Chemical and Materials Engineering, Faculty of Engineering, University of Alberta, Edmonton, AB T6G 2V4, Canada
Interests: molecular sieves; molecular separations; adsorption; nanopore and nanometal synthesis

Special Issue Information

Dear Colleagues,

Forming the heart of hundreds of processes as catalysts, adsorbents, ion-exchange and purification agents, crystalline molecular sieves are among the most important and valuable classes of inorganic materials. Utilized in petroleum cracking for gasoline production, for oxygen production from air, for water purification by removing heavy metals and much more, these materials directly impact our lives.  While molecular sieves are some of the most widely used adsorbents and purification agents known, recent discoveries may be particularly well suited for evolving energy and environmental applications.  New potential in the purification of waste water, natural gas processing and upgrading, and isolation and decontamination of hazardous gases from runaway nuclear reactors are among new, evolving applications. Papers centering on new molecular sieve properties and applications are particularly encouraged.

Prof. Dr. Steven M. Kuznicki
Guest Editor

Manuscript Submission Information

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Keywords

  • molecular sieves
  • zeolites
  • adsorption
  • nanometals
  • separation
  • purification
  • synthesis

Published Papers (1 paper)

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Research

376 KiB  
Article
Distributional Fate of Elements during the Synthesis of Zeolites from South African Coal Fly Ash
by Pieter W. Du Plessis, Tunde V. Ojumu, Ojo O. Fatoba, Richard O. Akinyeye and Leslie F. Petrik
Materials 2014, 7(4), 3305-3318; https://doi.org/10.3390/ma7043305 - 23 Apr 2014
Cited by 21 | Viewed by 7422
Abstract
The synthesis of zeolites from South African coal fly ash has been deemed a viable solution to the growing economical strain caused by the disposal of ash in the country. Two synthesis routes have been studied thus far namely the 2-step method and [...] Read more.
The synthesis of zeolites from South African coal fly ash has been deemed a viable solution to the growing economical strain caused by the disposal of ash in the country. Two synthesis routes have been studied thus far namely the 2-step method and the fusion assisted process. Fly ash contains several elements originating from coal which is incorporated in the ash during combustion. It is vital to determine the final destination of these elements in order to unveil optimization opportunities for scale-up purposes. The aim of this study was to perform a material balance study on both synthesis routes to determine the distributional fate of these elements during the synthesis of zeolites. Zeolites were first synthesized by means of the two synthesis routes. The composition of all raw materials and products were determined after which an overall and elemental balance were performed. Results indicated that in the 2-step method almost all elements were concentrated in the solid zeolite product while during the fusion assisted route the elements mostly report to the solid waste. Toxic elements such as Pb, Hg, Al, As and Nb were found in both the supernatant waste and washing water resulting from each synthesis route. It has also been seen that large quantities of Si and Al are wasted in the supernatant waste. It is highly recommended that the opportunity to recycle this liquid waste be investigated for scale-up purposes. Results also indicate that efficiency whereby Si and Al are extracted from fused ash is exceptionally poor and should be optimized. Full article
(This article belongs to the Special Issue Molecular Sieving and Materials)
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