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Inside AIREP's CNAS-Accredited Laboratory: How We Test Catalyst Performance
Release time:
Aug 26,2026
Behind every cubic meter of SCR catalyst that leaves the AIREP plant is a story of measured data, not marketing claims. As a national high-tech enterprise founded in 2012 and a "Little Giant" specialized-innovation company, AIREP has delivered more than 2,000 DeNOx projects across power, steel, cement, glass, coking, biomass, and gas-turbine applications. But the credibility that lets us stand behind those projects does not come from the production line alone — it comes from our **CNAS-accredited laboratory**, the engine room where catalyst performance is proven, quantified, and documented.
In DeNOx engineering, the catalyst is the most expensive and the most failure-prone component of the system. A wrong assumption about its activity can mean an under-sized reactor, ammonia slip penalties, or a forced outage during peak season. That is why testing is not an afterthought at AIREP — it is the first and last word on performance.
This article takes you inside that laboratory: what our accreditation means, the four pillars of our testing program, how a sample becomes a certified report, and why independent, third-party test data protects your project.
① What CNAS Accreditation Really Means
When customers search for a “CNAS accredited lab”, they are looking for more than a room full of instruments. CNAS — the China National Accreditation Service for Conformity Assessment — is the national body that evaluates testing and calibration laboratories against“ISO/IEC 17025”, the international standard for laboratory competence.
Accreditation is not a certificate you buy once and forget. It is a recurring, third-party audit of:
- “Technical competence” of personnel and methods
- “Traceability” of measurements to national and international standards
- “Calibration” status of every instrument in the chain
- “Documented procedures” that make results repeatable
- “Impartiality” — the lab must be independent and free of commercial bias
CNAS is a signatory to international mutual recognition arrangements (ILAC MRA). In practice, this means a test report issued under our accredited scope carries credibility well beyond China's borders and is recognized by counterparts in dozens of economies. For a “catalyst testing laboratory”, that recognition is what turns an internal check into defensible, courtroom- and tender-grade evidence.
> Bottom line: our CNAS accreditation means the numbers on your report have been earned under audited, internationally benchmarked conditions — not self-declared.
A common misconception is that CNAS covers the building. It does not — it covers “specific methods, within a defined scope, performed by named personnel on listed equipment”. Each accredited test method is individually documented, validated for accuracy and reproducibility, and re-examined at every surveillance visit. If a method falls outside the scope, we say so plainly. That honesty is exactly what makes the accredited scope trustworthy.
② Core Testing Capabilities
Our laboratory is built around the four measurements that actually determine whether an SCR catalyst will perform in the field. They are not isolated checks; together they answer the three questions every plant manager asks: Is it active enough? Will it survive? And why did it change?
1. Activity Testing — the heart of catalyst performance
Activity is the single most important property of an SCR catalyst. We measure it by passing a precisely controlled flue-gas mixture — NO, NH₃, O₂, and controlled levels of H₂O and SO₂ — through a known volume of catalyst at a defined temperature and space velocity. The resulting NOx conversion is converted into a “reaction-rate constant (k-value)” or expressed as “relative activity” against a reference.
This test answers the questions that decide a project: Is the fresh catalyst on spec? How much active life remains in a spent catalyst pulled from a live reactor? Activity testing is the foundation of every “SCR catalyst performance testing” program we run. Because activity is strongly temperature-dependent, we routinely sweep the temperature range relevant to your process — from low-temperature iron-zeolite systems near 180 °C to high-temperature honeycomb and plate types operating above 400 °C — so the k-value you receive is meaningful for the exact conditions your catalyst will see.
2. Abrasion / Wear Testing — mechanical durability under ash
Catalysts in cement kilns, steel sintering, and coal boilers live in high-dust, high-erosion environments. Our abrasion test subjects samples to a controlled air-jet of corundum or quartz sand, then measures mass loss and the change in mechanical strength after defined cycles. The result predicts how the catalyst will survive handling, vibration, and years of ash impingement — and how long it will hold its geometry before pressure drop climbs.
3. Microscopic Characterization — BET, XRD, SEM
Performance loss is rarely visible to the naked eye, so we look at the structure that matters:
- BET (Brunauer–Emmett–Teller): measures specific surface area and pore volume/diameter. Because SCR reactions happen on the catalyst surface, any loss of surface area signals a loss of active sites.
- XRD (X-ray Diffraction): identifies crystalline phases. We track the anatase/rutile ratio of the TiO₂ support, detect vanadia crystallization, and spot poisoning signatures such as sulfate or alkali deposition.
- SEM (Scanning Electron Microscopy):reveals surface morphology, pore blocking, micro-cracks, and the physical layers of fly ash or poisons that accumulate in service.
Together, these three techniques explain “why”a catalyst has aged — essential for root-cause analysis and for designing longer-lasting formulations.
4. Simulated Operating-Condition Denitration Efficiency Testing
This is the most customer-relevant capability we offer. Using bench- and pilot-scale reactors, we recreate your actual flue-gas scenario — temperature profile, gas composition, space velocity, and dust loading — and measure real-world “DeNOx efficiency”. Instead of trusting a generic curve, you see how a candidate catalyst will behave in “your” kiln, “your” gas turbine, or “your” boiler. It is the bridge between a datasheet and a de-risked engineering design.
③ Test Process: From Sampling to Report
A certified result depends on a disciplined chain of custody. Our process is:
1. “Consultation & sampling plan” — we define the parameters that matter for your process and advise on representative sampling.
2. “Sample receipt & log-in” — every sample gets a unique ID, photograph, and sealed chain-of-custody record.
3. “Pre-conditioning & physical inspection” — dimensions, apparent density, and crushing strength are recorded before any reaction testing.
4. “Activity & abrasion testing” — performed on calibrated rigs under controlled atmosphere.
5. “Microscopic characterization” — BET, XRD, and SEM as required by the engagement.
6. “Simulated-condition testing” — when the client needs site-specific efficiency validation.
7. “Data analysis & uncertainty evaluation” — results are checked against control samples and method uncertainty is assessed.
8. “Report generation” — drafted by the testing engineer, reviewed by a technical lead, and issued under the accredited scope with the CNAS mark where applicable.
9. “Delivery & consultation” — we walk you through the findings and recommend concrete actions, from catalyst selection to replacement timing.
④ Quality Assurance System
Our “CNAS accredited lab” operates inside an ISO/IEC 17025 framework that leaves little to chance:
- All instruments are calibrated on schedule and traceable to national standards.
- Certified reference materials and in-house controls bracket every test batch.
- Methods are validated and locked as standard operating procedures (SOPs).
- Duplicate and spiked samples are run to detect drift and bias.
- We participate in inter-laboratory comparisons (proficiency testing) to confirm our numbers match peers.
- Staff are trained, authorized per method, and re-assessed periodically.
- Internal audits and corrective-action loops keep the system honest.
The environment itself is controlled — temperature, humidity, and gas-supply purity are monitored so that the only variable in a test is the catalyst itself.
⑤ Meet the Laboratory Team
A laboratory is only as good as the people who run it. Our team is led by senior technical experts and staffed by engineers with advanced degrees in chemical and environmental engineering. What sets them apart is the combination of deep catalyst chemistry with hard-won field experience drawn from 2,000+ real projects.
That blend matters: when a test result looks unexpected, our engineers can tell the difference between a sampling error, a genuine poisoning event, and a normal aging curve — because they have seen all three in the field. The team is the reason our **SCR catalyst performance testing** is trusted from cement plants in Hebei to gas turbines offshore.
⑥ Why Third-Party Certified Data Matters to Customers
Independent, accredited data is not a luxury — it is risk management:
- “Objectivity for tenders and disputes.” A CNAS report is accepted as neutral evidence in bidding, acceptance, and warranty disputes.
- “Apples-to-apples supplier comparison.” Benchmark competing catalysts on the same accredited method instead of conflicting sales claims.
- “Informed lifecycle decisions.” Knowing true remaining activity lets you replace catalysts on evidence, not guesswork — avoiding both premature replacement cost and unexpected shutdown.
- “Engineering confidence.”Simulated-condition efficiency data de-risks reactor sizing and ammonia dosing design.
- “Regulatory and EPC trust.” Accredited results satisfy environmental-compliance and engineering-procurement-construction requirements.
In short, certified data protects your capex, your uptime, and your compliance record.
Consider a typical case: a steel-mill operator suspected its catalysts were poisoned after a fuel switch. A sales-driven assessment might have recommended a full, premature replacement. Our accredited testing showed the activity loss was moderate and concentrated in the top layer only. The client reconfigured dosing and deferred replacement by two campaigns — saving a seven-figure outlay while staying inside emission limits. That is the difference certified, unbiased data makes.
⑦ Contact Our Lab Team
Whether you need to qualify a new catalyst, assess spent catalyst for reuse, or validate a design against your real flue gas, our accredited laboratory is ready.
Want to verify catalyst performance with certified testing? Contact our lab team.
Learn about clean flue gas solutions?
With over 15 years of industry experience, we provide customized solutions. Please feel free to contact us for a free consultation.
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