High H<sub>2</sub> permeable SAPO‐34 hollow fiber membrane for high temperature propane dehydrogenation application
Zhigang Wang, Jeff Xu, Subhasis Pati, Tianjia Chen, Yuzhen Deng, Nikita Dewangan, Lie Meng, Y. S. Lin, Sibudjing Kawi
Abstract
Abstract SAPO‐34 hollow fiber zeolite membranes are successfully synthesized on α‐Al 2 O 3 hollow fiber ceramic substrates by secondary growth method, and used to separate H 2 from a binary mixture (H 2 , C 3 H 8 ) or ternary mixture (H 2 , C 3 H 8 , and C 3 H 6 ) under a wide temperature range (25–600°C) with the aim of using them for propane dehydrogenation (PDH) reactions at high temperature. The results show excellent performance for H 2 /C 3 H 8 and H 2 / C 3 H 8 & C 3 H 6 separation, with high H 2 permeance of 3.1 × 10 −7 mol/m 2 /s/Pa and H 2 /C 3 H 8 selectivity of 41 at 600°C. Additionally, the membrane shows stable performance for 140 hr of H 2 /C 3 H 8 separation test at 600°C. The high performance of this membrane is mainly attributed to the thin (∼2 μm) zeolite layer and asymmetric‐wall of the hollow fiber support. So far, this membrane offers the highest hydrogen permeation and selectivity for H 2 /C 3 H 8 separation at high temperature (600°C) compared to those reported in literature.