Metal–Organic Framework Supported Single Site Chromium(III) Catalyst for Ethylene Oligomerization at Low Pressure and Temperature

Plasma-chemical synthesis of nanopowders based on copper oxide and metal-organic framework structures was carried out using low-pressure arc discharge plasma. The study of the obtained material was carried out by several methods (XRD, FTIR, TEM, TGA and EIS). TEM showed that the obtained powder is highly agglomerated particles with an average particle size of 13 nm, and the crystalline ordering of nanoparticles with a large (about 2 nm) lattice parameter is clearly visible. XRD showed the presence of four crystalline phases corresponding to [Cu3 (BTC)2], Cu, Cu2O and CuO. XRD results are in good agreement with FTIR studies. The DTA curve demonstrates a continuous exothermic process associated with a number of features of plasma-chemical synthesis and the morphology of the obtained nanoparticles. The study of the electrochemical properties of the materials obtained by the method of impedance spectroscopy revealed an anomalous accumulation of electrical charges around the electrodes due to electrochemical reactions for [Cu3 (BTC)2], which are associated with various reactions involving copper species in the organic framework.

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Metal–Organic Framework Nodes Support Single-Site Nickel(II) Hydride Catalysts for the Hydrogenolysis of Aryl Ethers

ACS Catalysis ◽

10.1021/acscatal.8b04611 ◽

2019 ◽

Vol 9 (2) ◽

pp. 1578-1583 ◽

Cited By ~ 25

Author(s):

Yang Song ◽

Zhe Li ◽

Pengfei Ji ◽

Michael Kaufmann ◽

Xuanyu Feng ◽

...

Keyword(s):

Metal Organic Framework ◽

Single Site ◽

Metal Organic ◽

Aryl Ethers ◽

Organic Framework

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Tuning the properties of metal–organic framework nodes as supports of single-site iridium catalysts: node modification by atomic layer deposition of aluminium

Faraday Discussions ◽

10.1039/c7fd00031f ◽

2017 ◽

Vol 201 ◽

pp. 195-206 ◽

Cited By ~ 20

Author(s):

Dong Yang ◽

Mohammad R. Momeni ◽

Hakan Demir ◽

Dale R. Pahls ◽

Martino Rimoldi ◽

...

Keyword(s):

Atomic Layer Deposition ◽

Density Functional ◽

Metal Organic Framework ◽

Density Functional Theory Calculations ◽

Atomic Layer ◽

Single Site ◽

Iridium Complexes ◽

Layer Deposition ◽

Metal Organic ◽

Organic Framework

The metal–organic framework NU-1000, with Zr6-oxo, hydroxo, and aqua nodes, was modified by incorporation of hydroxylated Al(iii) ions by ALD-like chemistry with [Al(CH3)2(iso-propoxide)]2 followed by steam (ALD = atomic layer deposition). Al ions were installed to the extent of approximately 7 per node. Single-site iridium diethylene complexes were anchored to the nodes of the modified and unmodified MOFs by reaction with Ir(C2H4)2(acac) (acac = acetylacetonate) and converted to Ir(CO)2 complexes by treatment with CO. Infrared spectra of these supported complexes show that incorporation of Al weakened the electron donor tendency of the MOF. Correspondingly, the catalytic activity of the initial supported iridium complexes for ethylene hydrogenation increased, as did the selectivity for ethylene dimerization. The results of density functional theory calculations with a simplified model of the nodes incorporating Al(iii) ions are in qualitative agreement with some catalyst performance data.

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