Synthesis and characterization of nanocomposite SAPO‐34/ceramic membrane for post‐combustion CO₂ capture

Abstract

Thin‐film SAPO‐34 membranes can separate CO2 efficiently. However, crack formation due to thermal expansion mismatch between the SAPO‐34 crystals and the support occurs at high operating temperatures, thereby resulting in a dramatic loss. Nanocomposite architecture SAPO‐34 membranes prepared via pore‐plugging hydrothermal synthesis could overcome this problem. In this study, nanocomposite SAPO‐34 membranes were synthesized via pore‐plugging hydrothermal and evaluated for N2/CO2 separation. Physico‐chemical property of the as‐synthesized membranes was checked with X‐ray diffraction, scanning electron microscope, thermal gravimetric analyser, and Fourier transform infrared. The X‐ray diffraction pattern reveals characteristic peaks associated with the rhombohedral crystal type of SAPO‐34; thermal gravimetric analyser shows a high thermal stability, Fourier transform infrared spectra indicate the presence of the D6R and T–O vibrations which form an essential part of the SAPO‐34 structure, and scanning electron microscope images of the membranes reveal cubic morphology of the SAPO‐34 crystals embedded in the ceramic support. Single gas permeation experiments using pure component of CO2 and N2 conducted to evaluate the separation performance of the membranes during post‐combustion CO2 capture reveal that ideal selectivity increased significantly for multistage pore‐plugging hydrothermal synthesis. The Maxwell–Stefan model describes adequately the CO2 permeation behaviour through the membrane as well. However, the membrane flux reduced owing to increase in membrane thickness. © 2017 Curtin University and John Wiley & Sons, Ltd.

Recent Progress of SAPO-34 Zeolite Membranes for CO2 Separation: A Review

“…This approach led to high-quality membranes with no large defects, which improved the membrane performance. Kgaphola et al [ 111 ] reporteda nanocomposite SAPO-34 membrane fabricated by a pore-plugging hydrothermal PPH approach for post-combustion CO 2 capture. The PPH approach provided high mechanical and thermal stability as compared with the hydrothermal and seeded growth methods.…”

Small-Pore Zeolite Membranes: A Review of Gas Separation Applications and Membrane Preparation

“…Overall, it is hard for small-pore zeolite membranes to compete with polymer membranes for CO 2 /N 2 separation unless their selectivity can be significantly improved without sacrificing membrane permeance. [14,15,47,51,55,59,61,63,68,69,76,77,81,86,87,99,[105][106][107][108][109][110][111][112]. * denotes results from pure gas permeation tests.…”

“…Figure2. CO 2 /N 2 separation performance for different types of small-pore zeolite membranes[14,15,47,51,55,59,61,63,68,69,76,77,81,86,87,99,[105][106][107][108][109][110][111][112]. * denotes results from pure gas permeation tests.…”

Ion-Exchanged Silicoaluminophosphate-34 Membrane for Efficient CO2/N2 Separation with Low CO2 Concentration in the Gas Mixture

“…9,10,14 Because of their advantages, including high chemical and mechanical stability and well-defined pore structure, various types of zeolite membranes are being investigated by different researchers, and these zeolite membranes appear to be potential candidates for gas separation. 15−20 These include MFI, 21−27 FAU, 28−30 A-type, 31−37 DDR, 38,39 T-type, 40,41 and silicoaluminophosphate-34 (SAPO-34) 10,42,43 and CHA zeolite membranes. 44 Zeolite membranes such as SAPO-34 have gained importance for gas separation because of their small pore structure.…”

“…Membrane separation technology appears to be an energy-efficient alternative for gas separation in view of its advantages including relatively lower capital costs and simplicity in operation versus conventional separation technologies. ,, Because of their advantages, including high chemical and mechanical stability and well-defined pore structure, various types of zeolite membranes are being investigated by different researchers, and these zeolite membranes appear to be potential candidates for gas separation. − These include MFI, − FAU, − A-type, − DDR, , T-type, , and silicoaluminophosphate-34 (SAPO-34) ,, and CHA zeolite membranes . Zeolite membranes such as SAPO-34 have gained importance for gas separation because of their small pore structure.…”