Performance data of the membranes investigated in this study.

Diameter (mm)	Porous support	Thickness (μm)	N2 fluxa (mol s−1 m−2)	N2 fluxb (mol s−1 m−2)	Multiple
2.00	Alumina	4.00	2.12 × 10−10	3.72 × 10−11	0.18
2.00	Alumina	2.70	2.70 × 10−10	3.12 × 10−10	1.16
4.00	Alumina	3.50	7.69 × 10−9	1.66 × 10−8	2.16
6.00	Stainless-steel	3.90	4.43 × 10−10	1.10 × 10−8	24.86
12.00	Alumina	6.30	1.25 × 10−9	2.02 × 10−8	16.15

^aBefore feeding hydrogen.

^bAfter feeding hydrogen.