The Preparation of Porous Sol-Gel Silica with Metal Organic Framework MIL-101(Cr) by Microwave-Assisted Hydrothermal Method for Adsorption Chillers

Metal organic framework (MOF) of MIL-101(Cr)-Silica (SiO(2)) composites with highly mesoporous and uniform dispersions were synthesized by a microwave-assisted hydrothermal method followed by the sol-gel technique. Water vapor adsorption experiments were conducted on the MIL-101(Cr)-SiO(2) composites for industrial adsorption chiller applications. The effects of MIL-101(Cr)-SiO(2) mixing ratios (ranging from 0% to 52%), the surface area and amount of Lewis and Brønsted sites were comprehensively determined through water vapor adsorption experiments and the adsorption mechanism is also explained. The BET and Langmuir results indicate that the adsorption isotherms associated with the various MIL-101(Cr)-SiO(2) ratios demonstrated Type I and IV adsorption behavior, due to the mesoporous structure of the MIL-101(Cr)-SiO(2). It was observed that the increase in the amount of Lewis and Brønsted sites on the MIL-101(Cr)-SiO(2) composites significantly improves the water vapor adsorption efficiency, for greater stability during the water vapor adsorption experiments.