DUT-67 was synthesized according to a previously reported protocol via hydrothermal synthesis in water, using ZrOCl 2 • 8 H 2 O as the precursor salt and acetic acid as a modulator. The thermal treatment under humid gas flow was conducted by placing 300 mg of the as-synthesized DUT-67 in a ceramic boat and placing it in a pre-heated tube furnace at 300