Abstract
In this study, the hydrothermal method was used to synthesize MIL-101(Cr), and activated carbon (AC) with different content was incorporated in to MIL-101(Cr), thereby obtaining AC-MIL-101(Cr) composite material with a huge specific surface area. The physical properties of MIL-101(Cr) and AC-MIL-101(Cr) were characterized by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), nitrogen adsorption and desorption and specific surface area testing, and ethanol vapor adsorption performance testing. The results show that with the increase of activated carbon content, the thermal stability of AC-MIL-101(Cr) is improved. Compared with the pure sample, the BET specific surface area and pore volume of AC-MIL-101(Cr) have increased. In the relative pressure range of 0–0.4, the saturated adsorption capacity of AC-MIL-101(Cr) to ethanol vapor decreases slightly. It is lower than MIL-101(Cr), but its adsorption rate is improved. Therefore, AC-MIL-101(Cr)/ethanol vapor has a good application prospect in adsorption refrigeration systems. The exploration of AC-MIL-101(Cr) composite materials in this paper provides a reference for the future application of carbon-based/MOFS composite adsorbent/ethanol vapor working fluid in adsorption refrigeration.
Highlights
Electricity consumption caused by the demand for cooling and heating, as a result of the continuous development of the social economy, is expected to increase tenfold from 2010 to 2100 [1]
Rezk [10] and Janiak [11] studied the ethanol vapor adsorption performance of MIL101(Cr) and MIL-100 (Cr), and the results showed that the ethanol vapor adsorption isotherms of MIL-101(Cr) could be regarded as two combinations of I-type isotherms, one of which occurs in the low-pressure stage and the other in the medium pressure stage
The adsorption capacity of MIL-101 for methanol and ethanol is relatively high, the resolution temperature of mil is relatively high at low relative pressure, which is not suitable for use in Adsorption heat pumps (AHPs)/activated carbon (AC) and the most suitable metal-organic frameworks (MOFs) identified in this work are UiO-67, CAU-3, and ZIF-8, from a thermodynamic perspective, for both methanol and ethanol
Summary
Electricity consumption caused by the demand for cooling and heating, as a result of the continuous development of the social economy, is expected to increase tenfold from 2010 to 2100 [1]. The adsorption capacity of MIL-101 for methanol and ethanol is relatively high, the resolution temperature of mil is relatively high at low relative pressure, which is not suitable for use in AHPs/ACs and the most suitable MOFs identified in this work are UiO-67, CAU-3, and ZIF-8, from a thermodynamic perspective, for both methanol and ethanol. Both MIL-101(Cr) and activated carbon (AC) have good adsorption properties for ethanol vapor, there is currently no research on making them into composite. The adsorption performance of AC-MIL-101(Cr) on ethanol vapor was explored for the first time, indicating the application potential of AC-MIL-101(Cr)/ethanol vapor working fluid in solid adsorption refrigeration systems
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