Details
| Original language | English |
|---|---|
| Pages (from-to) | 117-123 |
| Number of pages | 7 |
| Journal | Microporous and Mesoporous Materials |
| Volume | 183 |
| Early online date | 12 Sept 2013 |
| Publication status | Published - 1 Jan 2014 |
Abstract
Structural instability in humid surroundings is one of the major drawbacks of many metal organic frameworks (MOFs) compared to zeolites. In this study we investigate the pronounced sensitivity of MOF Co2(dhtp) (Co-MOF-74 or CPO-27-Co) towards humid air. Guest uptake in big Co2(dhtp) crystals has been studied by IR microscopy. We found that already a short exposure of 30 s to moist air causes a surface blockage, completely preventing the adsorption of even small guest molecules. It could be confirmed in complementary PXRD measurements that the interior of the crystals remains intact during such short exposure times. Indications for a loss of crystallinity were evidenced only for notably longer exposure times (4 h). Most remarkably, the defects could at least be partially annealed in methanol atmosphere. Reversible adsorption of hydrocarbons in initially blocked crystals was found after exposing the crystals to methanol vapor for about 0.5 h.
Keywords
- Co-MOF-74 CPO-27-Co, Co(dhtp), IR microscopy, Phase transformation
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanics of Materials
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In: Microporous and Mesoporous Materials, Vol. 183, 01.01.2014, p. 117-123.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Idiosyncrasies of Co2(dhtp)
T2 - In situ-annealing by methanol
AU - Chmelik, Christian
AU - Mundstock, Alexander
AU - Dietzel, Pascal D.C.
AU - Caro, Jürgen
N1 - Funding Information: Financial support by DFG priority program SPP 1570 “Porous media with defined pore structure in chemical engineering – modeling, application, synthesis” is acknowledged. Prof. F. Keil is thanked for organizing this DFG Priority program. Further, we thank ENMIX, the "European Nanoporous Materials Institute of Excellence", for support.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Structural instability in humid surroundings is one of the major drawbacks of many metal organic frameworks (MOFs) compared to zeolites. In this study we investigate the pronounced sensitivity of MOF Co2(dhtp) (Co-MOF-74 or CPO-27-Co) towards humid air. Guest uptake in big Co2(dhtp) crystals has been studied by IR microscopy. We found that already a short exposure of 30 s to moist air causes a surface blockage, completely preventing the adsorption of even small guest molecules. It could be confirmed in complementary PXRD measurements that the interior of the crystals remains intact during such short exposure times. Indications for a loss of crystallinity were evidenced only for notably longer exposure times (4 h). Most remarkably, the defects could at least be partially annealed in methanol atmosphere. Reversible adsorption of hydrocarbons in initially blocked crystals was found after exposing the crystals to methanol vapor for about 0.5 h.
AB - Structural instability in humid surroundings is one of the major drawbacks of many metal organic frameworks (MOFs) compared to zeolites. In this study we investigate the pronounced sensitivity of MOF Co2(dhtp) (Co-MOF-74 or CPO-27-Co) towards humid air. Guest uptake in big Co2(dhtp) crystals has been studied by IR microscopy. We found that already a short exposure of 30 s to moist air causes a surface blockage, completely preventing the adsorption of even small guest molecules. It could be confirmed in complementary PXRD measurements that the interior of the crystals remains intact during such short exposure times. Indications for a loss of crystallinity were evidenced only for notably longer exposure times (4 h). Most remarkably, the defects could at least be partially annealed in methanol atmosphere. Reversible adsorption of hydrocarbons in initially blocked crystals was found after exposing the crystals to methanol vapor for about 0.5 h.
KW - Co-MOF-74 CPO-27-Co
KW - Co(dhtp)
KW - IR microscopy
KW - Phase transformation
UR - http://www.scopus.com/inward/record.url?scp=84885090515&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2013.09.002
DO - 10.1016/j.micromeso.2013.09.002
M3 - Article
AN - SCOPUS:84885090515
VL - 183
SP - 117
EP - 123
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
SN - 1387-1811
ER -