Advanced & Functional Materials
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H2/CO2 Membrane Separation
H₂ Separation Membrane
What is the fractional loss of mixed-gas H2/CO2 selectivity for two candidate layers on industrial supports between 1 h and 1000 h at 35 bar and 200 °C?
THE QUESTION
Which membrane composition exceeds H2/CO2 selectivity of [threshold] at permeance above [threshold] and holds it for [duration] under the target feed? Verifier: small-coupon permeation rig with GC. [baseline: to verify]
WORK ORDER
Measured 1000 h decay of mixed-gas H2/CO2 selectivity on an industrial support lot at 35 bar and 200 °C
BACKGROUND
What this Apodex Lab is
Recovering hydrogen from industrial shifted syngas requires separating hydrogen from carbon dioxide at high pressure and elevated temperature. Membrane units offer an alternative to palladium-silver alloy films or pressure-swing adsorption, operating directly on the existing feed pressure without separate thermal swings. Yet evaluating whether any selective layer can replace an alloy baseline depends on how long that layer survives when exposed continuously to steam, carbon monoxide and hydrogen sulphide at full process pressure.
Published literature evaluates candidate membranes, such as carbon molecular sieves, magnesium-doped silica and polymer systems, primarily as fresh, single coupons tested near ambient temperature on laboratory supports. These measurements yield ideal selectivity figures but suppress the operational degradation rate. In practice, selective layers are coated onto commercial porous supports, where mechanical compaction, pinhole growth and chemical poisoning alter separation performance over time. Without continuous mixed-gas permeation records at operational conditions, engineering models must populate membrane operating life by assumption, leaving unresolved whether fresh selectivity advantages survive hundreds of hours of exposure.
The H₂ Separation Membrane Apodex Lab tests candidate carbon molecular sieve and 20 mol% magnesium-doped silica layers alongside a commercial palladium-silver anchor coupon on identical tubular alpha-alumina supports. Running side by side at 35 bar and 200 °C under simulated shifted syngas containing 10 vol% steam, 1 vol% carbon monoxide and 1 ppm hydrogen sulphide for 1000 h with online gas chromatography, the measurement determines the fractional loss of mixed-gas H2/CO2 selectivity and hydrogen permeance with a 90% confidence interval. By attributing performance decay across the selective layer, porous support and seals, the output provides the verified degradation rate needed to decide whether a candidate material warrants long-term plant deployment or whether capital spend must remain with incumbent separation systems.
WHY NOW
Why the field is spending on an assumption
The field reports fresh selectivity and permeance pairs on laboratory supports near ambient temperature, rather than degradation over time. Evaluations of hydrogen-recovery membrane skids must assume selective-layer lifetime because no measured decay rates exist on manufacturable porous supports under hot, pressurised mixed gas containing steam, CO and H2S. Automated high-pressure mixed-gas permeation skids can now measure these multi-coupon trajectories continuously over 1000 h under certified simulated shifted syngas.
WHAT WE’D BUY
What we would ask a laboratory to run
We are not buying the answer. We are buying a measurement with an interval — and the bars it will be compared against.
Eleven coupons mounted on commercial tubular alpha-alumina porous supports run side by side on certified simulated shifted syngas at 35 bar and 200 °C for 1000 h. The array comprises four carbon molecular sieve coupons, four magnesium-doped silica coupons, one palladium-silver reference coupon, a bare support and a sealed dummy. Online gas chromatography tracks mixed-gas H2/CO2 selectivity and H2 permeance continuously. The delivery provides the mean fractional loss of selectivity and permeance between 1 h and 1000 h for each candidate composition, reported with a 90% confidence interval whose half-width is no wider than 0.15 absolute, alongside early-life loss over the first 50 h and the fraction of decay attributed to the selective layer, support and seals.
SCOPE & LIMITS
The simulated syngas feed lacks the heavier hydrocarbons, particulates and trace chlorides found in refinery off-gas, meaning the measured decay rates establish an upper bound on operational membrane lifetime.
WHO EXECUTES
The kind of lab that can run this
A membrane-science laboratory or contract test house with a high-pressure mixed-gas permeation rig (feed to ~30-40 bar, 100-300 °C) fitted with online gas chromatography, able to coat and mount candidate selective layers on commercial tubular or hollow-fiber porous supports and run coupons continuously for hundreds to thousands of hours on simulated shifted syngas including steam, CO and H2S.
EXECUTOR KIND
wet-lab
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