TY - JOUR
T1 - Development of MIL-101(Cr)/GrO composites for adsorption heat pump applications
AU - Elsayed, Eman
AU - Wang, Haiyan
AU - Anderson, Paul A.
AU - Al-dadah, Raya
AU - Mahmoud, Saad
AU - Navarro, Helena
AU - Ding, Yulong
AU - Bowen, James
PY - 2017/5/15
Y1 - 2017/5/15
N2 - Adsorption heat pumps can be used for generating heating, cooling, seasonal energy storage and water desalination applications. Metal-organic frameworks (MOFs) are hybrid porous materials with high surface area and superior adsorption characteristics compared to conventional adsorbents. MIL-101(Cr) has a large pore size with water vapour adsorption capacity up to 1.5 gH2O gads−1 and high cyclic stability, and thus has the potential to be used in adsorption heat pumps. This work investigates the enhancement of the thermal conductivity and water adsorption characteristics of MIL-101(Cr) using hydrophilic graphene oxide. Two methods have been used to develop MIL-101(Cr)/GrO composites. The first method was through the physical mixing of GrO and MIL-101(Cr) while the other was through incorporating the GrO during the synthesis process of MIL-101(Cr). The composites and neat MIL-101(Cr) were characterized in terms of their structure, water adsorption uptake, BET surface area, particle size, thermal gravimetric analysis, SEM images and thermal conductivity measurements. Results showed that introducing low amounts of GrO (2%) to the neat MIL-101(Cr) enhanced the water adsorption characteristics at high relative pressure but enhanced the heat transfer properties by 20–30% while using more than 2% of GrO reduced the water adsorption uptake but significantly enhanced the thermal conductivity by more than 2.5 times.
AB - Adsorption heat pumps can be used for generating heating, cooling, seasonal energy storage and water desalination applications. Metal-organic frameworks (MOFs) are hybrid porous materials with high surface area and superior adsorption characteristics compared to conventional adsorbents. MIL-101(Cr) has a large pore size with water vapour adsorption capacity up to 1.5 gH2O gads−1 and high cyclic stability, and thus has the potential to be used in adsorption heat pumps. This work investigates the enhancement of the thermal conductivity and water adsorption characteristics of MIL-101(Cr) using hydrophilic graphene oxide. Two methods have been used to develop MIL-101(Cr)/GrO composites. The first method was through the physical mixing of GrO and MIL-101(Cr) while the other was through incorporating the GrO during the synthesis process of MIL-101(Cr). The composites and neat MIL-101(Cr) were characterized in terms of their structure, water adsorption uptake, BET surface area, particle size, thermal gravimetric analysis, SEM images and thermal conductivity measurements. Results showed that introducing low amounts of GrO (2%) to the neat MIL-101(Cr) enhanced the water adsorption characteristics at high relative pressure but enhanced the heat transfer properties by 20–30% while using more than 2% of GrO reduced the water adsorption uptake but significantly enhanced the thermal conductivity by more than 2.5 times.
KW - Metal–organic framework
KW - Characterization
KW - Adsorption
KW - Heat pump
KW - Thermal conductivity
U2 - 10.1016/j.micromeso.2017.02.020
DO - 10.1016/j.micromeso.2017.02.020
M3 - Article
SN - 1387-1811
VL - 244
SP - 180
EP - 191
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
ER -