Special Issue "Zeolites and Catalysis"

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

Deadline for manuscript submissions: 15 December 2017

Special Issue Editor

Guest Editor
Dr. Pedro Castano

Department of Chemical Engineering, University of the Basque Country (UPV/EHU), Bilbao, Spain
Website | E-Mail
Interests: waste valorisation; zeolite catalysis; zeolite modification; catalyst deactivation; coke formation; periodic reactors; kinetic modelling

Special Issue Information

Dear Colleagues,

The field of zeolite catalysis is more exciting than ever. The potential for a vast number of structures, with numerous synthetic and post-synthetic modification routes, has led to a rich variety of materials with tunable catalytic features. Zeolites can be combined with other materials or other zeolites in order to obtain enhanced performance or synergic catalytic behavior between the phases. Outstanding catalytic properties, combined with high stability and an affordable price, have placed zeolites at the forefront of industrial catalysis, playing a crucial role in the worldwide economy and offering a bright future for sustainable development.

Novel characterization methods for zeolites and reactants/intermediates/products, particularly those methods used under reaction conditions (operando), provide valuable information regarding the structure dynamics of the zeolite, coupling it with the mechanism of reaction.

This Special Issue focuses on recent advances in zeolite catalysis, including advances in (1) understanding of the synthetic and post-synthetic modification routes; (2) modelling the catalytic properties and performance in reactions related to the sustainable chemical industry; (3) insights into the reaction pathways occurring on the surface; and (4) methodological approaches to resolve the interplay of structure-dynamics-mechanisms.

Dr. Pedro Castano
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 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.

Published Papers (4 papers)

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Research

Open AccessFeature PaperArticle The Role of Non-Framework Lewis Acidic Al Species of Alkali-Treated HZSM-5 in Methanol Aromatization
Catalysts 2017, 7(9), 259; doi:10.3390/catal7090259
Received: 5 August 2017 / Revised: 23 August 2017 / Accepted: 23 August 2017 / Published: 1 September 2017
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Abstract
Mesoporous HZSM-5 prepared by alkaline treatment (also termed desilication) has drawn significant attention due to its potential in large-scale production and in versatile applications, such as separation and catalysis. Alkali-treated HZSM-5 contains considerable amounts of non-framework (amorphous) Lewis acidic Al species on the
[...] Read more.
Mesoporous HZSM-5 prepared by alkaline treatment (also termed desilication) has drawn significant attention due to its potential in large-scale production and in versatile applications, such as separation and catalysis. Alkali-treated HZSM-5 contains considerable amounts of non-framework (amorphous) Lewis acidic Al species on the external surface, and is deemed to be essential in affecting its catalytic performances. This study intends to clarify the catalytic nature of amorphous Al species of alkali-treated HZSM-5 in methanol aromatization. Physicochemical characterizations, including N2 adsorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), magic-angle-spinning nuclear magnetic resonance (MAS NMR), inductively coupled plasma (ICP) analysis, NH3 temperature-programmed desorption (TPD), and methanol-TPD, were performed. The outcomes showed that non-framework Al promotes the hydride transfer in mesoporous HZSM-5, thereby facilitating the aromatization reaction. Among aromatic products, durene can be promoted by non-framework Al through methylation/transalkylation of other aromatics, particularly xylenes, instead of being promoted by reduced space confinement in mesoporous HZSM-5. Full article
(This article belongs to the Special Issue Zeolites and Catalysis)
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Open AccessArticle Nature and Location of Carbonaceous Species in a Composite HZSM-5 Zeolite Catalyst during the Conversion of Dimethyl Ether into Light Olefins
Catalysts 2017, 7(9), 254; doi:10.3390/catal7090254
Received: 18 July 2017 / Revised: 14 August 2017 / Accepted: 25 August 2017 / Published: 30 August 2017
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Abstract
The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the
[...] Read more.
The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at different temperatures, while the nature of those species has been studied using different spectroscopic and thermogravimetric techniques. The reaction occurs on the strongest acid sites of the zeolite micropores through olefins and alkyl-benzenes as intermediates. These species also condensate into bulkier structures (polyaromatics named as coke), particularly at higher temperatures and within the meso- and macropores of the matrix. The critical roles of the matrix and water in the reaction medium have been proved: both attenuating the effect of coke deposition. Full article
(This article belongs to the Special Issue Zeolites and Catalysis)
Figures

Open AccessArticle Functionalization of SSZ-13 and Fe-Beta with Copper by NH3 and NO Facilitated Solid-State Ion-Exchange
Catalysts 2017, 7(8), 232; doi:10.3390/catal7080232
Received: 7 July 2017 / Revised: 24 July 2017 / Accepted: 4 August 2017 / Published: 8 August 2017
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Abstract
We show that functionalization of SSZ-13 (CHA) and Fe-beta (*BEA) with copper using a recently reported solid-state ion-exchange method, facilitated by NH3 and nitrogen oxides (NO), is a viable route to prepare Cu-SSZ-13 and (Cu + Fe)-beta catalysts, starting from H-SSZ-13 and
[...] Read more.
We show that functionalization of SSZ-13 (CHA) and Fe-beta (*BEA) with copper using a recently reported solid-state ion-exchange method, facilitated by NH 3 and nitrogen oxides (NO), is a viable route to prepare Cu-SSZ-13 and (Cu + Fe)-beta catalysts, starting from H-SSZ-13 and Fe-beta, respectively. The physicochemical properties of the prepared catalysts are characterized by XRD, UV-Vis-spectroscopy and STEM-EDS, confirming that copper originally present in the physical mixture of CuO and H-SSZ-13, and CuO and Fe-beta, is inserted into the micropores of SSZ-13 and Fe-beta, respectively. Activity measurements in gas-flow reactor show that the samples are active for NO reduction by NH 3 -SCR over a broad temperature range, i.e., 150–500 C. For the Cu-SSZ-13 catalysts, which have a copper loading range of 0.5–4 wt. %, the sample prepared from the physical mixture with a CuO/SSZ-13 ratio corresponding to 2 wt. % Cu is the most active catalyst for NH 3 -SCR under the present reaction conditions. Furthermore, the (Cu + Fe)-beta catalyst shows higher NH 3 -SCR activity over a broader temperature range and especially at low temperature as compared to the Fe-beta and Cu-beta counterparts. The results encourage further elaboration on sequential ion-exchange procedures for bimetallic functionalization of zeolites. Full article
(This article belongs to the Special Issue Zeolites and Catalysis)
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Figure 1

Open AccessFeature PaperArticle Mesoporous ZSM-5 Zeolites in Acid Catalysis: Top-Down vs. Bottom-Up Approach
Catalysts 2017, 7(8), 225; doi:10.3390/catal7080225
Received: 26 May 2017 / Revised: 14 July 2017 / Accepted: 19 July 2017 / Published: 26 July 2017
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Abstract
A top-down desilication of Al-rich ZSM-5 zeolites and a bottom-up mesopores creating method were evaluated in this study. Three liquid–solid and one gas–solid heterogeneously-catalysed reactions were chosen to establish relationships between zeolites textural properties and their catalytic behavior in acid-catalysed model reactions that
[...] Read more.
A top-down desilication of Al-rich ZSM-5 zeolites and a bottom-up mesopores creating method were evaluated in this study. Three liquid–solid and one gas–solid heterogeneously-catalysed reactions were chosen to establish relationships between zeolites textural properties and their catalytic behavior in acid-catalysed model reactions that are influenced by shape selectivity: Diels-Alder cyclization between isoprene and methylacrylate, Methanol-to-Olefins (MTO) reaction, chlorination of iodobenzene with trichloroisocyanuric acid (TCCA), and Friedel-Crafts acylation of anisole by carboxylic acids with differing sizes. It is found amongst others that no optimal mesoporosity for all the different reactions can be easily obtained, but depending on the chosen application, a specific treatment has to be set to achieve high activity/selectivity and stability. Full article
(This article belongs to the Special Issue Zeolites and Catalysis)
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