Issue 21, 2019

Highly permeable and oriented AlPO-18 membranes prepared using directly synthesized nanosheets for CO2/CH4 separation

Abstract

Oriented AlPO-18 membranes with super high CO2 permeance were prepared for the first time by single secondary hydrothermal synthesis using directly synthesized nanosheet seeds. The membranes were grown on the inner surface of tubular asymmetric alumina supports. The morphology of membrane crystals and the membrane quality were highly affected by synthesis temperature and the amount of the structure directing agent in the membrane gel. The optimized AlPO-18 membranes had a ∼3 μm (110)-oriented top AlPO-18 layer upon a ∼1 μm (002)-oriented one. Both channels in the (110) and (002) directions of AlPO-18 zeolite provide fast transport channels, and thus the (110) & (002)-oriented AlPO-18 membranes showed the highest separation index [=CO2 permeance × (selectivity − 1) × permeate pressure] for CO2/CH4 separation among those reported in the literature. Single-gas permeances for H2, CO2, N2 and CH4 with different temperature and pressure drop were measured. The effects of temperature and pressure drop on the separation performance of the oriented membrane were also studied. The best membrane showed CO2 permeance as high as 3.6 × 10−6 mol (m2 s Pa)−1 (∼10 500 GPU) with a CO2/CH4 selectivity of 91.5 for an equimolar CO2/CH4 mixture at 0.2 MPa pressure drop and room temperature.

Graphical abstract: Highly permeable and oriented AlPO-18 membranes prepared using directly synthesized nanosheets for CO2/CH4 separation

Supplementary files

Article information

Article type
Paper
Submitted
31 Jan 2019
Accepted
03 May 2019
First published
03 May 2019

J. Mater. Chem. A, 2019,7, 13164-13172

Highly permeable and oriented AlPO-18 membranes prepared using directly synthesized nanosheets for CO2/CH4 separation

B. Wang, F. Gao, F. Zhang, W. Xing and R. Zhou, J. Mater. Chem. A, 2019, 7, 13164 DOI: 10.1039/C9TA01233H

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