Evaluation of the highly stable metal-organic framework MIL-53(Al)-TDC (TDC=2,5-thiophenedicarboxylate) as a new and promising adsorbent for heat transformation applications

The recently reported Al-based metal-organic framework MIL-53(Al)-TDC (TDC = 2,5-thiophenedicarboxylate) shows desirable water sorption properties towards adsorption-driven heat transformation applications with high thermal and solvent/pH stability as well as hydrothermal stability over 40 cycles. Water vapor sorption measurements at 25, 40 and 60 degrees C yielded an advantageous isosteric heat of adsorption of only 2.6 kJ g(-1), favoring the use of MIL-53(Al)-TDC in sorption based chilling where the released heat of adsorption corresponds to waste heat. The good cooling performance of MIL-53(Al)-TDC comes from desirable low desorption temperatures below 65 degrees C, with also desirable high condenser temperatures of around 40 degrees C and corresponding water exchange of almost 0.35 g g(-1). The thereby offered working window cannot be provided by common adsorbents and renders the material an ideal candidate for adsorption cooling applications.