The selective capture of C2H6 from C2H6/C2H4 mixtures is of critical importance to realize the efficient one-step purification of C2H4 but remains challenging due to their similar properties and smaller quadrupole moment of C2H6 that usually result in C2H4-preferring adsorption. Herein, we reported two isostructural pillared-layer metal-organic frameworks, ZUL-C3 and ZUL-C4, which were constructed by mixed polycycloalkane-type ligands. Their low-polar pore environment along with more accessible low-polar C-H binding sites on the pore surface are conducive to generate more van der Waals interactions with C2H6 while the carboxylic groups distributed at four corners of pores form stronger and more dipolar interactions with C2H6, cooperatively resulting in a good C2H6/C2H4 uptake ratio of 1.50 for ZUL-C3 and 1.72 for ZUL-C4 in static adsorption experiments and a high C2H4 (>99.99% purity) productivity of 10.1 L/kg for ZUL-C3 and 14.6 L/kg for ZUL-C4 from an equimolar C2H6/C2H4 mixture in breakthrough experiments.

Combination of Low-Polar and Polar Binding Sites in Aliphatic MOFs for the Efficient C2H6/C2H4 Separation.

Amino (-NH2)-functionalized metal-organic frameworks (MOFs) are widely applied to improve the properties of materials owing to the rich host-guest chemical properties of amino groups. In this work, the amino-functionalization strategy was thus employed to improve the sorption performance of methylene blue (MB). The introduction of -NH2 groups in AOBTC-Zn did not reduce the pore size of the framework but rather modulated and optimized the host-guest interactions of MOFs. The MB+ sorption result was significantly improved by the NH2-functionalized NH2-AOBTC-Zn. The results showed that the maximum sorption capacity of NH2-AOBTC-Zn is much higher (1623 mg/g) than that of AOBTC-Zn (204 mg/g), which was comparable with that of MIL-68(Al) (1666 mg/g). The adsorption kinetics and isothermal models indicated that the MB+ sorption processes of both MOFs were consistent with the Langmuir isothermal and pseudo-second-order kinetic models. The single-group and multicomponent sorption experiments showed that the sorption behavior was the result of π-π interaction, electrostatic interaction, hydrogen bonding interaction, and pore size interaction. In particular, NH2-AOBTC-Zn exhibits a higher adsorption capacity than AOBTC-Zn due to the additional hydrogen bonding interactions it provided. These may guide the design of porous MOFs with side group modification for liquid phase sorption/separation.

Ameliorating Adsorption Performance for Poisonous Methylene Blue through the Amino Functionalization of Metal-Organic Frameworks.

Long-term carbon accumulation is a leading cause of global climate change. Carbon dioxide (CO2) capture and storage (CCS) using porous materials is a versatile pathway capable of achieving carbon neutrality...

Pore engineering of metal-organic frameworks for boosting low-pressure CO2 capture

The achievement of direct C2H4 separation from C2 hydrocarbons is very challenging in the petrochemical industry due to their similar molecular sizes, boiling points, and physicochemical properties. In this work, a nonpolar/inert ultramicroporous metal-organic framework (MOF), [Co3(μ3-OH)(tipa)(bpy)1.5]·3DMF·6H2O (1), with stand-alone one-dimensional square tubular channels was successfully constructed, its pore enriched with plenty of aromatic rings causing nonpolar/inert pore surfaces. The MOF shows preferential adsorption of C2H6 compared to C2H4 and C2H2 in the low-pressure region, which is further verified by adsorption heats and selectivities. The C2H4 separation potential in one step for binary C2H6/C2H4 (50/50 and 10/90) and ternary C2H4/C2H6/C2H2 (89/10/1) is also examined by transient breakthrough simulations. Moreover, grand canonical Monte Carlo simulations demonstrate that the unique reversed adsorption mechanism is due to the shortest and most number of C-H···π interactions between C2H6 and the framework.

Ultramicroporous Metal-Organic Framework with Inert Pore Surfaces for Inversed Separation of Ethylene from C2 Hydrocarbons Mixtures.

Sustainable Utilization of Palladium from Industrial Catalytic Waste by A Smart Magnetic Nano Stirring Robot

Selective adsorption of ethane over ethylene through a metal–organic framework bearing dense alkyl groups

Chemical absorption of CO2 by amine solutions is an industrialized operation and currently represents the most practical technology worldwide. However, the development of amine absorbents with high efficiency and energy-saving benefits remains a major challenge. Here, we developed a novel class of amines through the target-specific modification of the secondary amine group in diethylenetriamine (DETA) with various hydroxyalkyls. The obtained amines present enhanced overall efficiency for CO2 capture, especially with regards to the absorption/desorption rates and recyclability. Significantly, the regeneration energy consumption for the developed amines can be reduced to a remarkable low value of 2.78 GJ t-1 CO2. Moreover, the CO2 absorption and desorption processes were closely monitored by nuclear magnetic resonance (NMR). Combined with density functional theory (DFT) calculations, the mechanism of the developed amine for CO2 capture was fully elucidated. This targeted modification strategy provides a new avenue for the development of efficient amine absorbents for practical CO2 capture. 

Target-specific modification of diethylenetriamine with hydroxyalkyls: Efficient absorbents for CO2 capture

Mass transfer and catalyst recovery are two crucial issues in solid base catalysis, while the cumbersome operation steps and the associated time and energy penalties are still inevitable for conventional catalysts. Achieving the technical upgrades through catalyst design is desirable but challenging because of the difficulty in satisfying diverse demands of different steps. In this work, a magnetically responsive solid base catalyst with the rod-like nanostructure was developed. The rod-like solid base catalysts are composed of Fe3O4 cores, silica shells and calcium oxide active sites. The functions of magnetic recovery and stirring were integrated into the catalyst, which applies in both the general catalytic processes and microchannel reactors given their nanoscales. When applied to the synthesis of dimethyl carbonate by one-step transesterification of methanol and ethylene carbonate, an apparent enhancement on turnover frequency value (33.1 h−1) was observed for nano-stirring compared with that tested without stirring (12.1 h−1) within 30 min. The present catalysts may open up new avenues in the development of advanced solid base catalysts. 

/pdf/generating-strongly-basic-sites-on-magnetic-nano-stirring-26exdbfu.pdf

Generating strongly basic sites on magnetic nano-stirring bars: Multifunctional integrated catalysts for transesterification reaction

Isolation of light-switchable metal–organic cages within the targeted cavities of metal–organic frameworks through light-assisted precise size control, thus providing an efficient, light-switchable adsorbent for tunable CO2 adsorption.

https://pubs.rsc.org/en/content/articlepdf/2023/qi/d3qi00412k

Target-specific isolation of light-switchable metal–organic cages within metal–organic frameworks for tunable CO2 adsorption

A light-switchable metal–organic cage presents controllable CO 2 adsorption as a result of the reversible trans / cis configuration isomerization of the incorporated pendant azobenzene groups. 

Metal−organic cage with light-switchable motifs for controllable CO2 adsorption

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Yao Jiang

Author Tools

Chat about Author