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Special Issue "Zeolite Membranes: Novel Synthesis and Innovative Applications"

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A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: closed (31 July 2012)

Special Issue Editor

Guest Editor
Dr. Reyes Mallada (Website)

Department of Chemical and Environmental Engineering, University of Zaragoza, Edif. I+D, Campus Río Ebro, Despacho: 7.2.09, C/ Mariano Esquillor s/n, 50018-Zaragoza, Spain
Interests: synthesis inorganic porous materials; zeolite layers; zeolite membranes; mesoporous M41S; microwave heating; microreactors

Special Issue Information

Dear Colleagues,

Zeolites are microporous materials that possess molecular sieving and selective adsorption properties, the preparation of a zeolite membrane opens up the possibility of working in a continuous process, furthermore a zeolite film would be desirable in several applications such as structured reactors or sensors.Since the first synthesis of a zeolite membrane in 1986, many milestones have been achieved. The preparation of a “defect free” zeolite layer, for gas separation, was the first and is still a matter of study. The control of the orientation of the zeolite crystals was accomplished by secondary growth and the use of organic structure-directing agents. An important success was accomplished in 2001 when the first industrial application of zeolites was introduced, the pervaporation of water/alcohol mixtures. Concerning applications, apart from gas separation and pervaporation, membrane reactors have also been an attractive research topic.

The most studied zeolite membranes are indeed the MFI and LTA frameworks; however there is still a research effort for other zeotypes and new materials related such as titanosilicates, aluminophosphates or recently the microporous metal organic frameworks.

In the last five years many efforts have been devoted to the synthesis of hybrid or mixed matrix membranes. The assembly of nanozeolite building blocks and nanosheets is also the starting point, for the synthesis of thin defect free zeolite membranes. The ultrafast synthesis of zeolites in microwave has contributed to prevent the dissolution of the support. These new synthesis methods and new materials will be covered in this special issue.

Considering the difficulty to prepare high areas of defect free zeolite membranes, innovative applications that include zeolite films or small scale applications such as microreactors, micromembranes, sensors, films for controlled permeation or coatings are being explored in the last few years.

Dr. Reyes Mallada
Guest Editor

Keywords

  • zeolite membrane
  • zeolite films
  • mixed matrix membranes
  • hybrid membranes
  • porous tailored materials
  • membrane reactor
  • gas separation
  • pervaporation
  • microreactor
  • sensors

Published Papers (2 papers)

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Research

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Open AccessArticle Alkylation of Benzene with Propylene in a Flow-Through Membrane Reactor and Fixed-Bed Reactor: Preliminary Results
Materials 2012, 5(5), 872-881; doi:10.3390/ma5050872
Received: 4 March 2012 / Revised: 14 April 2012 / Accepted: 24 April 2012 / Published: 18 May 2012
Cited by 3 | PDF Full-text (575 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
Benzene alkylation with propylene was studied in the gas phase using a catalytic membrane reactor and a fixed-bed reactor in the temperature range of 200–300 °C and with a weight hourly space velocity (WHSV) of 51 h−1. β-zeolite was [...] Read more.
Benzene alkylation with propylene was studied in the gas phase using a catalytic membrane reactor and a fixed-bed reactor in the temperature range of 200–300 °C and with a weight hourly space velocity (WHSV) of 51 h−1. β-zeolite was prepared by hydrothermal synthesis using silica, aluminum metal and TEAOH as precursors. The membrane’s XRD patterns showed good crystallinity for the β-zeolite film, while scanning electron microscopy SEM results indicated that its random polycrystalline film was approximately 1 μm thick. The powders’ specific area was determined to be 400 m2×g−1 by N2 adsorption/desorption, and the TPD results indicated an overall acidity of 3.4 mmol NH3×g−1. Relative to the powdered catalyst, the catalytic membrane showed good activity and product selectivity for cumene. Full article
(This article belongs to the Special Issue Zeolite Membranes: Novel Synthesis and Innovative Applications)

Review

Jump to: Research

Open AccessReview Potential Applications of Zeolite Membranes in Reaction Coupling Separation Processes
Materials 2012, 5(11), 2101-2136; doi:10.3390/ma5112101
Received: 26 July 2012 / Revised: 28 August 2012 / Accepted: 13 September 2012 / Published: 30 October 2012
Cited by 11 | PDF Full-text (949 KB) | HTML Full-text | XML Full-text | Correction | Supplementary Files
Abstract
Future production of chemicals (e.g., fine and specialty chemicals) in industry is faced with the challenge of limited material and energy resources. However, process intensification might play a significant role in alleviating this problem. A vision of process intensification through multifunctional reactors [...] Read more.
Future production of chemicals (e.g., fine and specialty chemicals) in industry is faced with the challenge of limited material and energy resources. However, process intensification might play a significant role in alleviating this problem. A vision of process intensification through multifunctional reactors has stimulated research on membrane-based reactive separation processes, in which membrane separation and catalytic reaction occur simultaneously in one unit. These processes are rather attractive applications because they are potentially compact, less capital intensive, and have lower processing costs than traditional processes. Therefore this review discusses the progress and potential applications that have occurred in the field of zeolite membrane reactors during the last few years. The aim of this article is to update researchers in the field of process intensification and also provoke their thoughts on further research efforts to explore and exploit the potential applications of zeolite membrane reactors in industry. Further evaluation of this technology for industrial acceptability is essential in this regard. Therefore, studies such as techno-economical feasibility, optimization and scale-up are of the utmost importance. Full article
(This article belongs to the Special Issue Zeolite Membranes: Novel Synthesis and Innovative Applications)

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