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Adaptive Pore Opening to Form Tailored Adsorption Sites in a Cooperatively Flexible Framework Enables Record Inverse Propane/Propylene Separation.
J Am Chem Soc
October 2023
Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States.
A proposed low-energy alternative to the separation of alkanes from alkenes by energy-intensive cryogenic distillation is separation by porous adsorbents. Unfortunately, most adsorbents preferentially take up the desired, high-value major component alkene, requiring frequent regeneration. Adsorbents with inverse selectivity for the minor component alkane would enable the direct production of purified, reagent-grade alkene, greatly reducing global energy consumption.
View Article and Find Full Text PDFThermal Polymorphism in CsCBH.
Molecules
March 2023
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899-6102, USA.
Article Synopsis
- Thermal polymorphism in alkali-metal salts containing the icosohedral monocarba-hydridoborate anion (CBH) leads to unique dynamical behaviors and superionic conductivity, especially in lighter salts like LiCBH and NaCBH.
- Recent studies have focused less on heavier salts like CsCBH, which is crucial for understanding structural arrangements and interactions across the alkali-metal series.
- Investigations into CsCBH revealed two polymorphs with similar free energies at room temperature, exhibiting unexpected temperature-dependent structural changes, with quasielastic neutron scattering showing the CBH anions experiencing isotropic rotational diffusion at elevated temperatures.
Observation of an Intermediate to H Binding in a Metal-Organic Framework.
J Am Chem Soc
September 2021
Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.
Coordinatively unsaturated metal sites within certain zeolites and metal-organic frameworks can strongly adsorb a wide array of substrates. While many classical examples involve electron-poor metal cations that interact with adsorbates largely through physical interactions, unsaturated electron-rich metal centers housed within porous frameworks can often chemisorb guests amenable to redox activity or covalent bond formation. Despite the promise that materials bearing such sites hold in addressing myriad challenges in gas separations and storage, very few studies have directly interrogated mechanisms of chemisorption at open metal sites within porous frameworks.
View Article and Find Full Text PDFPorous Covalent Organic Polymers for Efficient Fluorocarbon-Based Adsorption Cooling.
Angew Chem Int Ed Engl
August 2021
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.
Adsorption-based cooling is an energy-efficient renewable-energy technology that can be driven using low-grade industrial waste heat and/or solar heat. Here, we report the first exploration of fluorocarbon adsorption using porous covalent organic polymers (COPs) for this cooling application. High fluorocarbon R134a equilibrium capacities and unique overall linear-shaped isotherms are revealed for the materials, namely COP-2 and COP-3.
View Article and Find Full Text PDFSelf-adjusting binding pockets enhance H and CH adsorption in a uranium-based metal-organic framework.
Chem Sci
July 2020
Department of Chemistry , University of California, Berkeley , CA 94720 , USA . Email:
A new, air-stable, permanently porous uranium(iv) metal-organic framework U(bdc) (, bdc = 1,4-benzenedicarboxylate) was synthesized and its H and CH adsorption properties were investigated. Low temperature adsorption isotherms confirm strong adsorption of both gases in the framework at low pressures. gas-dosed neutron diffraction experiments with different D loadings revealed a rare example of cooperative framework contraction (Δ = -7.
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