Fig. 1: Rational design of template modulated crystal transition (TMCT).
From: Control of zeolite framework flexibility for ultra-selective carbon dioxide separation
a DD3R framework structure. The blue and orange cages denote the [435126183] and [435661] cages, respectively. The green area denotes the 8MR window. To clearly observe the structure, the [512] cages were not displayed. b Illustration of [435126183] cage flexibility occupied by template molecule (fresh) and carbons (TMCT). The orange rings represent the 8MR window of DD3R zeolite. c Illustration of expected temperature-dependent expansion of fresh (red line) and TMCT (blue line) DD3R zeolite. d Illustration of defective and defect-free DD3R zeolite membranes after the conventional calcination at 550 °C. Fresh, as-synthesized zeolite; TMCT, overheating at 700 °C for 1 min.
