jing Zhang

Microporous metal-organic framework with potential for carbon dioxide capture at ambient conditions

Carbon dioxide capture and separation are important industrial processes that allow the use of carbon dioxide for the production of a range of chemical products and materials, and to minimize the effects of carbon dioxide emission. Porous metal-organic frameworks are promising materials to achieve such separations and to replace current technologies, which use aqueous solvents to chemically absorb carbon dioxide. Here we show that a metal-organic frameworks (UTSA-16) displays high uptake (160 cm(3) cm(-3)) of CO(2) at ambient conditions, making it a potentially useful adsorbent material for post-combustion carbon dioxide capture and biogas stream purification. This has been further confirmed by simulated breakthrough experiments. The high storage capacities and selectivities of UTSA-16 for carbon dioxide capture are attributed to the optimal pore cages and the strong binding sites to carbon dioxide, which have been demonstrated by neutron diffraction studies.

Perspective of microporous metal–organic frameworks for CO2 capture and separation

It is emergent to reduce carbon dioxide emissions from fossil fuel combustion and thereby limit climate destabilization. In order to achieve the industrial scenario of CCS, there is a need for the discovery of better solid CO2 adsorbents that realize great improvement of selective capacity and stability to moisture as well as significant reductions in energy requirements and costs. In this review, we provide an overview of the current status of the emerging microporous metal–organic frameworks (MOFs) for the storage and separation of carbon dioxide. We summarize the main factors for CO2 capture performance of MOF materials under different working conditions, in comparison with those for zeolite materials. At the same time, we analyze the relationship among porous structures, pore/window sizes, capacity, selectivity and enthalpy of porous MOFs for CCS, which will give us clues for the design and synthesis of MOF materials as CO2 adsorbents.

Open Metal Sites within Isostructural Metal–Organic Frameworks for Differential Recognition of Acetylene and Extraordinarily High Acetylene Storage Capacity at Room Temperature

Chemical equcation Presented On the metal: Open metal sites within isostructural [M2(DHTP)] metal-organic frameworks (M = Co 2-, Mn2+, Mg2+, and Zn2+; DHTP = 2,5-dihydroxyterephthalate) exhibit differential molecular recognition with acetylene. The extremely strong interaction of Co2+with acetylene (see structure) makes [Co2(DHTP)] the highest volumetric acetylene storage material with a capacity of 230 cm3cm-3 at 295 K and 1 atm. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

A rod packing microporous metal–organic framework with open metal sites for selective guest sorption and sensing of nitrobenzene

A microporous MOF [Zn(4)(OH)(2)(1,2,4-BTC)(2)] (1,2,4-BTC = Benzene-1,2,4-tricarboxylate) with two immobilized open metal Zn(2+) sites was obtained by solvothermal reaction, which exhibits highly selective guest sorption and sensing of nitrobenzene.

A robust doubly interpenetrated metal-organic framework constructed from a novel aromatic tricarboxylate for highly selective separation of small hydrocarbons.

A microporous metal-organic framework, for the first time, has been developed for highly selective separation of industrially important C(1), C(2) and C(3) hydrocarbons at room temperature.

High separation capacity and selectivity of C2 hydrocarbons over methane within a microporous metal-organic framework at room temperature.

A separation story! A microporous metal-organic framework (UTSA-34) of non-interpenetrated binodal (4,6)-connected ybh network with interconnected cages of about 12.8 Å has been realised to exhibit highly selective separation of C(2) hydrocarbons from methane with a separation capacity of 3.0 mol  kg(-1) and selectivity of 35 at room temperature (see figure).

Microporous metal–organic frameworks for acetylene storage and separation

Acetylene is an important starting material in the petrochemical and electronic industry for various industrial and consumer products, and a promising alternative energy source for future acetylene fuel cell vehicles. Porous metal–organic frameworks have been demonstrated as very practical useful materials for acetylene storage and separation which might provide the solid resolution for the safe storage and transportation of acetylene. Because of the explosive nature of acetylene, strong interactions of the pore surfaces with acetylene are very important to realize high acetylene storage MOFs at room temperature and low pressure, which can be fulfilled by the immobilization of open metal sites. Microporous MOFs having high adsorption affinity and matchable pore size with acetylene molecules have been realized to exhibit high selective C2H2/CO2, C2H2/CH4 and C2H2/C2H4 separation.

A new approach to construct a doubly interpenetrated microporous metal-organic framework of primitive cubic net for highly selective sorption of small hydrocarbon molecules

A new approach has been realized to construct a three-dimensional doubly interpenetrated cubic metal-organic framework Zn(2)(PBA)(2)(BDC)·(DMF)(3)(H(2)O)(4) (UTSA-36, HPBA=4-(4-pyridyl) benzoic acid, H(2)BDC=1,4-benzenedicarboxylic acid) through the self-assembly of the pyridylcarboxylate linker 4-(4-pyridyl) benzoate and bicarboxylate linker 1,4-benzenedicarxylate with paddle-wheel [Zn(2)(COO)(4)]. The activated UTSA-36a exhibits highly selective gas sorption of C(2)H(6), C(2)H(4) and C(2)H(2) over CH(4) with the Henry laws selectivities of 11 to 25 in the temperature range of 273 to 296 K attributed to the unique 3D intersected pore structure of about 3.1 to 4.8 Å within the framework, indicating that UTSA-36a is a potentially very useful and promising microporous material for such industrially important separation of C(2) hydrocarbons over methane.

High Anhydrous Proton Conductivity of Imidazole-Loaded Mesoporous Polyimides over a Wide Range from Subzero to Moderate Temperature

On-board fuel cell technology requires proton conducting materials with high conductivity not only at intermediate temperatures for work but also at room temperature and even at subzero temperature for startup when exposed to the colder climate. To develop such materials is still challenging because many promising candidates for the proton transport on the basis of extended microstructures of water molecules suffer from significant damage by heat at temperatures above 80 °C or by freeze below -5 °C. Here we show imidazole loaded tetrahedral polyimides with mesopores and good stability (Im@Td-PNDI 1 and Im@Td-PPI 2) exhibiting a high anhydrous proton conductivity over a wide temperature range from -40 to 90 °C. Among all anhydrous proton conductors, the conductivity of 2 is the highest at temperatures below 40 °C and comparable with the best materials, His@[Al(OH)(1,4-ndc)]n and [Zn3(H2PO4)6(H2O)3](Hbim), above 40 °C.

A microporous lanthanide-tricarboxylate framework with the potential for purification of natural gas

A novel robust three-dimensional lanthanide organic framework with high thermal stability has been demonstrated to exhibit the potential for purification of natural gas in nearly pure form from an 8-component gas mixture at room temperature.