Polyamine-Tethered Porous Polymer Networks for Carbon Dioxide Capture from Flue Gas

In silico design of adamantane derived organic superbases with an extended hydrogen bond network and their use as molecular containers for the storage of H2 and CO2

DFT calculations predicted that amine substituted adamantane derivatives can function as organic superbases and can be used for gas storage.

Creating extra pores in microporous carbon via a template strategy for a remarkable enhancement of ambient-pressure CO2uptake

The creation of extra pores by removal of the silicon template in a porous carbon material derived from carbonizing silicon-containing POP has afforded a remarkable enhancement of ambient-pressure CO₂uptake capacity.

Enhanced CO2 adsorption capacity of amine-functionalized MIL-100(Cr) metal–organic frameworks

Functionalization of the MIL-100(Cr) metal–organic framework with alkylamines (ethylenediamine and N,N′-dimethylethylenediamine) improves carbon dioxide sorption properties, especially in the case of ethylenediamine.

An investigation of the textural properties of mesostructured silica-based adsorbents for predicting CO2 adsorption capacity

The CO₂ uptake of more than 30 physisorbents was found to correlate with their textural parameters, namely the product of the available surface area (S_BET) and the affinity of the surface toward adsorptives (C parameter).

Porous organic polymers derived from tetrahedral silicon-centered monomers and a stereocontorted spirobifluorene-based precursor: synthesis, porosity and carbon dioxide sorption

Porous organic polymers show high and tunable porosity, and moderate CO₂ uptake and CO₂ selectivity over other gases simultaneously using tetrahedral silicon-centered monomers and a stereocontorted spirobifluorene-based precursor as building units.

Multi-hydroxyl-containing porous organic polymers based on phenol formaldehyde resin chemistry with high carbon dioxide capture capacity

Synthesis of multi-hydroxyl-containing porous organic polymers with considerable CO₂ capture capability and CO₂/N₂ selectivity is reported.

Temperature and CO2 responsive polyethylenimine for highly efficient carbon dioxide release

Temperature and CO₂ responsive behaviour and highly efficient carbon dioxide release was achieved via acylation of commercial available polyethylenimine.

The local electric field favours more than exposed nitrogen atoms on CO2 capture: a case study on the rht-type MOF platform

Investigations of CO₂ adsorption in two rht-MOFs indicated that the local electric field favours more than the exposed nitrogen atoms for the interactions with CO₂ molecules.

Reversible single-crystal-to-single-crystal transformation from a mononuclear complex to a fourfold interpenetrated MOF with selective adsorption of CO2

Reversible crystal transformation was observed between a mononuclear complex to a fourfold interpenetrated MOF with selective adsorption of CO₂ up to 12.5 wt% at room temperature and low pressure.

CMP aerogels: ultrahigh-surface-area carbon-based monolithic materials with superb sorption performance

Monolithic conjugated microporous polymer (CMP) aerogels are obtained in an extremely facile way by selection of adequate reaction conditions and a freeze-drying technique. The aerogels possess an ultrahigh specific surface area and hierarchical interconnected pores, exhibiting superb gas/oil adsorption performance compared with all microporous organic polymers to date.

Molecular template-directed synthesis of microporous polymer networks for highly selective CO2 capture

Porous polymer networks have great potential in various applications including carbon capture. However, complex monomers and/or expensive catalysts are commonly used for their synthesis, which makes the process complicated, costly, and hard to scale up. Herein, we develop a molecular template strategy to fabricate new porous polymer networks by a simple nucleophilic substitution reaction of two low-cost monomers (i.e., chloromethylbenzene and ethylene diamine). The polymerization reactions can take place under mild conditions in the absence of any catalysts. The resultant materials are interconnected with secondary amines and show well-defined micropores due to the structure-directing role of solvent molecules. These properties make our materials highly efficient for selective CO2 capture, and unusually high CO2/N2 and CO2/CH4 selectivities are obtained. Furthermore, the adsorbents can be completely regenerated under mild conditions. Our materials may provide promising candidates for selective capture of CO2 from mixtures such as flue gas and natural gas.

Zeolite-like metal-organic frameworks (ZMOFs): design, synthesis, and properties

This review highlights various design and synthesis approaches toward the construction of ZMOFs, which are metal-organic frameworks (MOFs) with topologies and, in some cases, features akin to traditional inorganic zeolites. The interest in this unique subset of MOFs is correlated with their exceptional characteristics arising from the periodic pore systems and distinctive cage-like cavities, in conjunction with modular intra- and/or extra-framework components, which ultimately allow for tailoring of the pore size, pore shape, and/or properties towards specific applications.

Introduction of π-complexation into porous aromatic framework for highly selective adsorption of ethylene over ethane

In this work, we demonstrate for the first time the introduction of π-complexation into a porous aromatic framework (PAF), affording significant increase in ethylene uptake capacity, as illustrated in the context of Ag(I) ion functionalized PAF-1, PAF-1-SO3Ag. IAST calculations using single-component-isotherm data and an equimolar ethylene/ethane ratio at 296 K reveal that PAF-1-SO3Ag shows exceptionally high ethylene/ethane adsorption selectivity (Sads: 27 to 125), far surpassing benchmark zeolite and any other MOF reported in literature. The formation of π-complexation between ethylene molecules and Ag(I) ions in PAF-1-SO3Ag has been evidenced by the high isosteric heats of adsorption of C2H4 and also proved by in situ IR spectroscopy studies. Transient breakthrough experiments, supported by simulations, indicate the feasibility of PAF-1-SO3Ag for producing 99.95%+ pure C2H4 in a Pressure Swing Adsorption operation. Our work herein thus suggests a new perspective to functionalizing PAFs and other types of advanced porous materials for highly selective adsorption of ethylene over ethane.

In silico design of porous polymer networks: high-throughput screening for methane storage materials

Porous polymer networks (PPNs) are a class of advanced porous materials that combine the advantages of cheap and stable polymers with the high surface areas and tunable chemistry of metal-organic frameworks. They are of particular interest for gas separation or storage applications, for instance, as methane adsorbents for a vehicular natural gas tank or other portable applications. PPNs are self-assembled from distinct building units; here, we utilize commercially available chemical fragments and two experimentally known synthetic routes to design in silico a large database of synthetically realistic PPN materials. All structures from our database of 18,000 materials have been relaxed with semiempirical electronic structure methods and characterized with Grand-canonical Monte Carlo simulations for methane uptake and deliverable (working) capacity. A number of novel structure-property relationships that govern methane storage performance were identified. The relationships are translated into experimental guidelines to realize the ideal PPN structure. We found that cooperative methane-methane attractions were present in all of the best-performing materials, highlighting the importance of guest interaction in the design of optimal materials for methane storage.

Alkylamine-tethered stable metal-organic framework for CO(2) capture from flue gas

Different alkylamine molecules were post-synthetically tethered to the unsaturated Cr(III) centers in the metal-organic framework MIL-101. The resultant metal-organic frameworks show almost no N2 adsorption with significantly enhanced CO2 capture under ambient conditions as a result of the interaction between amine groups and CO2 molecules. Given the extraordinary stability, high CO2 uptake, ultrahigh CO2 /N2 selectivity, and mild regeneration energy, MIL-101-diethylenetriamine holds exceptional promise for post-combustion CO2 capture and CO2 /N2 separation.

Ammonia capture in porous organic polymers densely functionalized with Brønsted acid groups

The elimination of specific environmental and industrial contaminants, which are hazardous at only part per million to part per billion concentrations, poses a significant technological challenge. Adsorptive materials designed for such processes must be engendered with an exceptionally high enthalpy of adsorption for the analyte of interest. Rather than relying on a single strong interaction, the use of multiple chemical interactions is an emerging strategy for achieving this requisite physical parameter. Herein, we describe an efficient, catalytic synthesis of diamondoid porous organic polymers densely functionalized with carboxylic acids. Physical parameters such as pore size distribution, application of these materials to low-pressure ammonia adsorption, and comparison with analogous materials featuring functional groups of varying acidity are presented. In particular, BPP-5, which features a multiply interpenetrated structure dominated by <6 Å pores, is shown to exhibit an uptake of 17.7 mmol/g at 1 bar, the highest capacity yet demonstrated for a readily recyclable material. A complementary framework, BPP-7, features slightly larger pore sizes, and the resulting improvement in uptake kinetics allows for efficient adsorption at low pressure (3.15 mmol/g at 480 ppm). Overall, the data strongly suggest that the spatial arrangement of acidic sites allows for cooperative behavior, which leads to enhanced NH3 adsorption.

Ln–Cd heterometal organic–inorganic hybrid materials based on diverse Ln–Cd oxo-cluster chains: syntheses, structures and visible luminescence

Two types of luminescent Ln–Cd heterometal complexes, I and II, based on diverse Ln–Cd oxo-clusters have been synthesized and characterized.

Synthesis and sorption properties of hexa-(peri)-hexabenzocoronene-based porous organic polymers

In this communication, we report the synthesis of several novel hexa(peri)-hexabenzocoronene containing microporous polymers.

Metallosalen-based microporous organic polymers: synthesis and carbon dioxide uptake

Three metallosalen-based microporous organic polymers were designed and synthesized. New materials display excellent porosity and good capacities for store and separation of carbon dioxide at 273 K and 1 bar.

Pretreated multiwalled carbon nanotube adsorbents with amine-grafting for removal of carbon dioxide in confined spaces

Three different methods, including thermal treatment, treatment with HNO₃ and O₂ oxidation, were used to pretreat multiwalled carbon nanotubes (MWCNTs) before grafting with N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPS).