Xylene separation on a diverse library of exchanged faujasite zeolites

Khabzina, Yoldes; Laroche, Catherine; Pérez-Pellitero, Javier; Farrusseng, David

doi:10.1016/j.micromeso.2017.03.026

Cited by 18 publications

(14 citation statements)

References 12 publications

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“…Moreover, the requirement of expensive supports and the difficulty of scale‐up production acts as further deterrents to the practical application of MFI membranes for xylene separations despite their exceptional performance in the lab. As the demand of xylene isomers is expected to maintain a 5–7 % yearly growth, it is imperative to develop new, scalable membranes that exhibit promising separation performance under practical operating conditions.…”

Section: Figurementioning

confidence: 99%

Creation of Well‐Defined “Mid‐Sized” Micropores in Carbon Molecular Sieve Membranes

Jue

Zhang

et al. 2019

Angewandte Chemie

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Carbon molecular sieve (CMS) membranes are candidates for the separation of organic molecules due to their stability, ability to be scaled at practical form factors, and the avoidance of expensive supports or complex multi‐step fabrication processes. A critical challenge is the creation of “mid‐range” (e.g., 5–9 Å) microstructures that allow for facile permeation of organic solvents and selection between similarly‐sized guest molecules. Here, we create these microstructures via the pyrolysis of a microporous polymer (PIM‐1) under low concentrations of hydrogen gas. The introduction of H2 inhibits aromatization of the decomposing polymer and ultimately results in the creation of a well‐defined bimodal pore network that exhibits an ultramicropore size of 5.1 Å. The H2 assisted CMS dense membranes show a dramatic increase in p‐xylene ideal permeability (≈15 times), with little loss in p‐xylene/o‐xylene selectivity (18.8 vs. 25.0) when compared to PIM‐1 membranes pyrolyzed under a pure argon atmosphere. This approach is successfully extended to hollow fiber membranes operating in organic solvent reverse osmosis mode, highlighting the potential of this approach to be translated from the laboratory to the field.

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Section: Figurementioning

confidence: 99%

Creation of Well‐Defined “Mid‐Sized” Micropores in Carbon Molecular Sieve Membranes

Jue

Zhang

et al. 2019

Angewandte Chemie

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“…Whilst other alternative high throughput production methods were developed, [ 73–75 ] the majority of new innovations are limited to HT structural characterization and activity or HT post‐synthetic treatments. [ 44,76–83 ] Notably, there is a lack of development of “full” HT library generation workflows, with current state‐of‐the‐art systems only automating a few portions of the synthesis process or lack robotization in important areas, such as zeolite synthesis or post‐synthetic treatment. Also, the automated workstations are often isolated from other stations with manual, as opposed to more efficient robotic, sample transport being required.…”

Section: Experimental High Throughput Methods For Zeolite Synthesis Amentioning

confidence: 99%

High Throughput Methods in the Synthesis, Characterization, and Optimization of Porous Materials

et al. 2020

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Notwithstanding these impediments, in many fields of materials science, solutions are being designed to mitigate hindrances to the efficient sampling of chemical space and improving the robustness of computational screening models through a combination of high throughput synthesis (HTS), characterization, and machine learning. In this review, we highlight key developments in high throughput approaches pertinent to porous materials. Specifically, we focus on developments in the field of zeolitic materials, metal-organic frameworks (MOFs), and touch upon covalent organic frameworks (COFs). Although superficially these classes of materials have little in common, there are structural links such as topology which allow for the consideration of how high throughput methods contrast with one another. By contrasting developments in different fields, we identify some underutilized approaches which could be leveraged in the future. We target structurally ordered materials because the exploration of chemical and topological space is more straightforward to enumerate, though similar approaches could be applied to disordered materials. The scale of the problem faced in materials science of targeted structure and function [1] is by no means unique; in drug discovery, HTS and chemoinformatic approaches have been used for more than 40 years in an attempt to accelerate the discovery of druggable molecules. [2,3] Unlike the drug discovery process, where Lipinski's "rule of 5" [4] provides a reliable top level sift for viable targets, identifying the most promising material for a target application requires very particular properties that may be intertwined in complex and contradictory ways. For example, thermoelectrics require high electrical conductivity and low thermal conductivity and yet these properties are typically correlated unless they can be separated. [5] Given the large scope of potential applications, the advent of the Materials Genome Initiative (MGI) [6,7] in the United States has undoubtedly helped to promote ways to solve the aforementioned obstacles and numerous others. Similarly there are major initiatives within the EU (e.g., NOMAD [8] and BIGmax [9]) and Switzerland (MARVEL [10]). In the MGI, nanoporous materials, including zeolites and MOFs, have been specifically targeted [11] and in this review, we seek to highlight particular challenges in the field of porous materials and how researchers have sought to overcome these challenges. We focus primarily on the methods used in HTS and rapid throughput/screening computational approaches. Aspects of high throughput computation applied to porous materials have been reviewed before, [12-14] as has high throughput experimentation (HTE) [15,16] but here we focus on their combination within an integrated workflow. Porous materials are widely employed in a large range of applications, in particular, for storage, separation, and catalysis of fine chemicals. Synthesis, characterization, and pre-and post-synthetic computer simulations are mostly carried out in a piecemeal a...

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“…Benzene, toluene, and xylene are fundamental synthetic starting materials for many aromatic derivatives such as polyesters, plastics and detergents. Xylenes (p-, mand o-) have the greatest market demand with an increasing annual rate of 5-6% [1]. The availability of surplus toluene and low value of C 9 aromatics makes the transalkylation process an attractive method of making higher value aromatic compounds, principally xylenes [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogenative regeneration on the activity of beta and Pt-Beta zeolites during the transalkylation of toluene with 1,2,4-trimethylbenzene

Almulla

Zholobenko

Tedstone

et al. 2020

Microporous and Mesoporous Materials

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Catalyst deactivation remains a main challenge in the transalkylation process. To develop a cost-effective and eco-friendly catalyst, improving the regeneration characteristics of Beta/Pt-Beta catalysts was investigated. The regeneration process was carried out using hydrogen and up to four cycles (30 hours on stream per cycle). A Pt-Beta catalyst with enhanced regeneration and activity characteristic relative to the parent materials is presented, and found to be stable, with the activity fully restored by regeneration with hydrogen at 500 o C. The activity of the parent Beta dropped gradually after each cycle suggesting that the hydrogen alone at 500 o C was insufficiently effective in removing coke precursors. The drop in activity was attributed to the disappearance of Brønsted acid sites over the spent Beta catalyst due to the growth of coke molecules trapped in cavities leading to highly polyaromatic molecules blocking those active sites. This limitation can be effectively overcome by platinum addition.

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Xylene separation on a diverse library of exchanged faujasite zeolites

Cited by 18 publications

References 12 publications

Creation of Well‐Defined “Mid‐Sized” Micropores in Carbon Molecular Sieve Membranes

Creation of Well‐Defined “Mid‐Sized” Micropores in Carbon Molecular Sieve Membranes

High Throughput Methods in the Synthesis, Characterization, and Optimization of Porous Materials

Effect of hydrogenative regeneration on the activity of beta and Pt-Beta zeolites during the transalkylation of toluene with 1,2,4-trimethylbenzene

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