NOx removal from CO₂ streams, to transport and storage spec.
Krajete is an Austrian gas-purification specialist. We do two things: we analyse what is really in your industrial gas stream, and we remove the NOx, with regenerative zeolite adsorbers that work at ambient temperature, without ammonia, catalysts or process water. Outlets reach the 1 ppm class in industrial service.
Because trace acids scale with pressure and time. NOx, SOx and H₂S at just ppm levels combine with residual moisture to form nitric, sulphuric and other acids — inside pipelines, ship tanks, compressors and injection wells. That is why CO₂ transport and storage specifications cap these impurities at single-digit ppm levels — and why an off-spec stream is not a fine but a stopped project: a rejected cargo, a halted injection, a corroding asset.
| Impurity |
 What it does in a CO₂ chain
|
Where Krajete takes it |
|---|---|---|
| NOx | Nitric acid formation → pipeline & tank corrosion | < 1 ppm in field service; 1–3.5 ppb measured in CO₂ matrices |
| SOx | Sulphuric acid formation; spec-capped | Co-captured alongside NO, documented in the same campaigns |
| H₂S | Corrosion + safety limits | Co-captured; quantified per stream in the analysis |
Your CO₂ passes tailored zeolite adsorber beds at ambient temperature; trace NOx, SOx and H₂S are held in the media's pores, and the CO₂ leaves cleaner than it came — nothing dosed, no reaction products, no thermal treatment of the product stream. This matters because a product stream tolerates no additives: an ammonia-based system would trade one impurity for another.
When a bed saturates, flow shifts to a parallel bed; the loaded bed is gently heated and releases a small concentrated stream — handled separately, never re-entering your CO₂. Wet or dry: performance in humid CO₂ matrices is measured and published, not assumed.
The cement kiln campaign (~10 ppm outlets on real kiln gas) also began exactly here, with a sampling and analysis programme.
See all case studies
Flagship
Onshore oil & gas facility: trace acids threatened a pipeline not designed for them. Our regenerative adsorbers held impurities comfortably below 1 ppm at pipeline entry, extended projected pipeline life by a decade — and opened a nitric-acid recovery route.
Read the caseTypical clients
Emitters feeding CCS hubs, CO₂ transport and shipping operators, storage and hub developers, and CO₂ utilisation manufacturers whose feedstock purity gates product quality. Slipstream pilots integrate ahead of the compressor or the custody-transfer point, where the spec is enforced.
Every project begins with the €4,900 CO₂ analysis, your gap-to-spec, quantified in 4 weeks.
How the analysis works€15,000–25,000
6–8 weeks
€90,000–250,000
3–6 months
Supply contract
licence case-by-case
That is our other business area: regenerative NOx removal for industrial gas streams and exhaust, the SCR alternative, with its own page and proof.
The science
got harder.
The promise
got simpler.
Fifteen years of adsorption research, down to one sentence: send us one sample, we'll tell you what's really there.
Krajete delivers measurement, feasibility, engineering and pilot-scale systems, plus media supply and supervision. Full-scale construction is executed together with established engineering partners, from our design basis and licence — after the technology has proven itself on your own CO₂, at pilot, against your spec.
If adsorption is not the right answer for your stream,
the report says so, and the analysis fee is refunded.
We design to your contract: transport, storage or utilisation specifications. In field service we have held NOx, SOx and H₂S comfortably below 1 ppm on a ~100,000 m³/h stream; in wet and dry CO₂ matrices, measured outlets reached 1–3.5 ppb. The €4,900 analysis quantifies your specific gap-to-spec in 4 weeks.
Off-spec CO₂
is a stopped project
One sample. Four weeks. Your gap-to-spec, quantified, or your money back.
