Electrocatalysis & Energy Conversion
·
Mild-Condition Ammonia Catalysis
Green Ammonia Catalyst
How much ammonia is lost on promoted ruthenium at 400 C and 30 bar across a 5%-to-100%-to-5% hydrogen swing across ramp periods of 5, 30 and 120 minutes?
THE QUESTION
Which catalyst activates N2 at <=400 C and <=30 bar at an ammonia synthesis rate above [threshold], and is the rate limited by N2 dissociation or by hydrogen poisoning? Verifier: fixed-bed flow reactor with online NH3 quantification. [baseline: to verify]
WORK ORDER
Frequency-resolved ammonia production deficit under 5%-to-100% hydrogen feed swings on promoted ruthenium
BACKGROUND
What this Apodex Lab is
Green ammonia plants coupled directly to wind and solar power cannot run at a steady baseline. To follow fluctuating renewable power, synthesis loops are required to ramp between 10% and 100% of capacity within thirty minutes, swinging hydrogen feed rates from 5% to 100%. Chemical plant designers sizing these synthesis loops must decide whether to expand catalyst volumes, invest in hydrogen buffer storage, or install heavier compression. That engineering choice depends on how much product a catalyst delivers while its feed fluctuates, rather than how it performs under undisturbed laboratory conditions.
Published catalytic literature reports mild-condition activity almost exclusively at constant feed on freshly activated samples held at or below 400 C and 30 bar. These steady-state screening figures, including reported rates of 85.3 mmol NH3 per gram of cobalt per hour on cobalt systems and high baseline rates on promoted ruthenium, ignore load-following transients. Nobody has measured whether a catalyst loses cumulative ammonia output during rapid hydrogen swings relative to its own steady-state rate curve, nor whether any observed derate stems from slow nitrogen dissociation or from hydrogen poisoning across the active surface. Because academic studies maintain stable feeds and dynamic commercial specifications do not disclose surface mechanisms, dynamic loop models still rely on unverified steady-state rate equations.
The Green Ammonia Catalyst Apodex Lab evaluates a commercially sourced promoted-ruthenium catalyst in a programmable fixed-bed flow reactor held at 400 C and 30 bar. By swinging the hydrogen feed between 5% and 100% of design flow across ramp periods of 5, 30 and 120 minutes while quantifying effluent ammonia online, the measurement isolates the blank-subtracted cumulative production deficit per swing and determines the local apparent hydrogen reaction order. If the deficit expands at faster ramps and reveals surface hydrogen poisoning, plant designers apply a measured derate margin to catalyst charges while catalyst developers redirect formulation toward suppressing hydrogen coverage. If output tracks instantaneous feed with negligible transient loss, capital moves away from over-sizing catalyst beds toward compression and buffer infrastructure.
WHY NOW
Why the field is spending on an assumption
Dynamic green-ammonia plants specify rapid load ramps between 10% and 100% in thirty minutes, with feed control down to 5% hydrogen. Yet published mild-condition catalyst rates come almost entirely from steady-state measurements on fresh material at constant feed. Plant designers choosing between low-pressure loops and standard compression loops must model dynamic ramps against rate equations that have never been tested under fluctuating gas feeds. The field cannot say whether synthesis rates fall during load swings because nitrogen dissociation slows or because excess hydrogen poisons the catalyst surface.
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.
A fixed-bed flow reactor held at 400 C and 30 bar measures ammonia output from a gram-scale charge of promoted ruthenium on a basic support as hydrogen feed swings between 5% and 100% of design flow. Total pressure and flow remain constant using an inert gas. Output is logged every 10 seconds and calibrated against acid titration. The measurement returns the cumulative production deficit per swing across ramp periods of 5, 30 and 120 minutes, with a 95% confidence interval no wider than plus or minus 3 percentage points at each period, blank-subtracted against an inert packing. It also reports the apparent hydrogen reaction order at the top and bottom of each swing.
SCOPE & LIMITS
The result bounds the rate penalty from hydrogen-feed variations alone on a gram-scale catalyst bed at constant total flow and pressure, without the coupled pressure swings, recycles or thermal inertia of an industrial converter.
WHO EXECUTES
The kind of lab that can run this
A catalysis laboratory or contract research facility operating a programmable fixed-bed flow reactor rated to at least 30 bar and 450 C, with mass-flow control able to swing hydrogen feed between 5% and 100% and online ammonia quantification (conductivity or IR/UV analyser calibrated against acid trapping).
EXECUTOR KIND
wet-lab
WAYS IN
FOR PIs, LABS & CROs
Complete tasks no model can.
Paid per task, credited by name — a “Verified by” line for as long as the discovery it settled exists. You choose the work: browse the tasks above, respond to what you can actually run.
CREATE AN APODEX LAB
Have a question of your own?
Give it its own laboratory. Watch it decompose into an executable manifest.
ASK A FOLLOW-UP QUESTION
Push on our assumptions.
Every Apodex Lab lists what it doesn’t know. Good questions compound.
Every Apodex Lab shares the same verified-knowledge ledger. No laboratory works alone.