3 research outputs found
Additional file 1 of Does the critical shoulder angle decrease after acromioplasty? A systematic review and meta-analysis
Additional file 1. PRISMA checklist of the meta-analysis
A Stable Y(III)-Based Amide-Functionalized Metal–Organic Framework for Propane/Methane Separation and Knoevenagel Condensation
Here, a Y(III)-based metal–organic
framework, JLU-MOF112 {[Y3(μ3-O)2(μ3-OH)(H2O)2(BTCTBA)2]·2[(CH3)2NH2]·5DMF·C6H5Cl·4H2O}, has been successfully synthesized
under solvothermal conditions. JLU-MOF112 was constructed
with amide-functionalized tricarboxylate ligands and Y(III)-based
infinite chains, where the Y3 repeating units are arranged
in a trans order. The overall framework could be
viewed as a novel (3,5)-connected net with two types of channels along
the [100] and [010] directions. JLU-MOF112 possesses
a large BET surface area (1553 m2 g–1), a permanent pore volume (0.67 cm3 g–1), and outstanding thermal and chemical stability, which give JLU-MOF112 potential for the purification of natural gas,
especially the equimolar separation of C3H8/CH4 with a high selectivity of 176. In addition, benefiting from
the amide functional groups as Brønsted basic sites and the exposure
of open metal sites as Lewis acid sites after activation, JLU-MOF112 can serve as a high-efficiency heterogeneous catalyst for Knoevenagel
condensation by the reactions of malononitrile with benzaldehyde (yield
of 98%, turnover number of 392, and turnover frequency of 3.27 min–1) and diverse aldehyde compounds. A rational mechanism
was put forward that the Knoevenagel condensation was catalyzed by
the synergistic effect of the Lewis acid sites and Brønsted basic
sites, engendering the polarization of the carbonyl groups and the
deprotonation of the methylene groups for nucleophilic attack
Three Robust Isoreticular Metal–Organic Frameworks with High-Performance Selective CO<sub>2</sub> Capture and Separation
Based on the hard-soft acid base (HSAB) theory, three
robust isoreticular
metal–organic frameworks (MOFs) with nia topology
were successfully synthesized by solvothermal reaction {[In3O(BHB)(H2O)3]NO3·3DMA (JLU-MOF110(In)), [Fe3O(BHB)(H2O)3]NO3 (JLU-MOF110(Fe)), and [Fe2NiO(BHB)(H2O)3] (JLU-MOF110(FeNi)) (DMA = N,N-dimethylacetamide,
H6BHB = 4,4″-benzene-1,3,5-triyl-hexabenzoic acid)}.
Both JLU-MOF110(In) and JLU-MOF110(Fe) are
cationic frameworks, and their BET surface areas are 301 and 446 m2/g, respectively. By modification of the components of metal
clusters, JLU-MOF110(FeNi) features a neutral framework,
and the BET surface area is increased up to 808 m2/g. All
three MOF materials exhibit high chemical and thermal stability. JLU-MOF110(In) remains stable for 24 h at pH values ranging
from 1 to 11, while JLU-MOF110(Fe) and JLU-MOF110(FeNi) persist to be stable for 24 h at pH from 1 to 12. JLU-MOF110(In) exhibits thermal stability up to 350 °C, whereas JLU-MOF110(Fe) and JLU-MOF(FeNi) can be stable up to 300 °C.
Thanks to the microporous cage-based structure and abundant open metal
sites, JLU-MOF110(In), JLU-MOF110(Fe), and JLU-MOF110(FeNi) have excellent CO2 capture capacity
(28.0, 51.5, and 99.6 cm3/g, respectively, under 298 K
and 1 bar). Interestingly, the ideal adsorption solution theory results
show that all three MOFs exhibit high separation selectivity toward
CO2 over N2 (35.2, 43.2, and 43.2 for CO2/N2 = 0.15/0.85) and CO2 over CH4 (14.4, 11.5, and 10.1 for CO2/CH4 =
0.5/0.5) at 298 K and 1 bar. Thus, all three MOFs are potential candidates
for CO2 capture and separation. Among them, JLU-MOF110(FeNi) displays the best separation potential, as revealed by dynamic column
breakthrough experiments
