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Integration of Open Metal Sites and Lewis Basic Sites for Construction of a Cu MOF with a Rare Chiral Oh‐type cage for high performance in methane purification.
- Source :
- Chemistry - A European Journal; 9/6/2018, Vol. 24 Issue 50, p13181-13187, 7p
- Publication Year :
- 2018
-
Abstract
- Abstract: A Cu metal‐organic framework (MOF), [Cu<subscript>4</subscript>(PMTD)<subscript>2</subscript>(H<subscript>2</subscript>O)<subscript>3</subscript>]⋅20 H<subscript>2</subscript>O, 1, (where PMTD is 1,4‐phenylenebis(5‐methyl‐4H‐1,2,4‐triazole‐3,4‐diyl)bis(5‐carboxylato‐3,1‐phenylene)bis(hydroperoxymethanide)), with a rare chiral O<subscript>h</subscript>‐type cage, and dual functionalities of open metal sites and Lewis basic sites, based on a designed U‐shaped ligand, was synthesized by hydrothermal methods. It exhibits high CO<subscript>2</subscript>, C<subscript>2</subscript>, and C<subscript>3</subscript> hydrocarbon storage capacity under atmospheric pressure, as well as high H<subscript>2</subscript> (1.96 wt.%) adsorption capacity at 77 K. Methane purification capacity was tested and verified step by step. Isosteric heats (Q<subscript>st</subscript>) studies reveal that CH<subscript>4</subscript> has the weakest van der Waals host–guest interactions among the seven gases at 298 K. Ideal adsorbed solution theory (IAST) calculation reveals that compound 1 is more selective toward CO<subscript>2</subscript>, C<subscript>2</subscript>H<subscript>6</subscript>, and C<subscript>3</subscript>H<subscript>8</subscript> over CH<subscript>4</subscript> in further calculating its separation capacity, as exemplified for CO<subscript>2</subscript>/CH<subscript>4</subscript> (50:50, 5:95), C<subscript>2</subscript>H<subscript>6</subscript>/CH<subscript>4</subscript> (50:50, 5:95), or C<subscript>3</subscript>H<subscript>8</subscript>/CH<subscript>4</subscript> (50:50, 5:95) binary gas mixtures. Breakthrough experiments show that 1 has a significantly higher adsorption capacity for CO<subscript>2</subscript>, C<subscript>2</subscript>H<subscript>6</subscript>, and C<subscript>3</subscript>H<subscript>8</subscript> than CH<subscript>4</subscript>. The selective adsorption properties of 1 make it a promising candidate for methane purification. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09476539
- Volume :
- 24
- Issue :
- 50
- Database :
- Complementary Index
- Journal :
- Chemistry - A European Journal
- Publication Type :
- Academic Journal
- Accession number :
- 131821725
- Full Text :
- https://doi.org/10.1002/chem.201800010