Control of zeolite framework flexibility for ultra-selective carbon dioxide separation.

Molecular sieving membranes with uniform pore size are highly desired for carbon dioxide separation. All-silica zeolite membranes feature well-defined micropores, but the size-exclusion effect is significantly compromised by the non-selective macro-pores generated during detemplation. Here we propose a template modulated crystal transition (TMCT) approach to tune the flexibility of Decadodecasil 3 R (DD3R) zeolite to prepare ultra-selective membranes for CO 2 /CH 4 separation. An instantaneous overheating is applied to synchronize the template decomposition with the structure relaxation. The organic template molecules are transitionally converted to tight carbon species by the one-minute overheating at 700 °C, which are facilely burnt out by a following moderate thermal treatment. The resulting membranes exhibit CO 2 /CH 4 selectivity of 157~1,172 and CO 2 permeance of (890~1,540) × 10 -10  mol m -2 s -1 Pa -1 . The CO 2 flux and CO 2 /CH 4 mixture selectivity reach 3.6 Nm 3 m -2 h -1 and 43 even at feed pressure up to 31 bar. Such strategy could pave the way of all-silica zeolite membranes to practical applications.