H2SCR™ replaces delivered DEF with on-demand ammonia synthesis at the point of use — cutting logistics, eliminating storage, and achieving NOx reductions equivalent to traditional SCR systems. CO₂-free when paired with green hydrogen.
Every conventional SCR system depends on a continuous external supply of DEF or bulk ammonia — creating ongoing cost, complexity, and risk that H2SCR™ eliminates entirely.
H2SCR™ produces ammonia on site from hydrogen and nitrogen, then injects it into a conventional SCR catalyst — the same proven NOx chemistry, without the supply chain.
Hydrogen is generated via electrolysis, reforming, biomass, or sourced from existing industrial supply.
Nitrogen is extracted from ambient air or existing industrial gas systems — no cryogenic storage needed.
H₂ and N₂ are catalytically combined on demand at the point of use. No DEF, no bulk ammonia, no logistics.
Ammonia is injected into the SCR catalyst, converting NOx to clean nitrogen and water vapor — 90%+ efficiency.
H2SCR™ is designed for integration into existing and new equipment wherever NOx control is required.
Data centers, hospitals, emergency backup, and industrial gensets — high operating hours, high DEF consumption.
Cement plants, refineries, chemical plants, and manufacturing with continuous emissions obligations.
Municipal wastewater treatment, pumping stations, and utility backup generation.
Vessel engines facing tightening IMO NOx Tier III requirements and zero-tolerance port emissions zones.
Combined heat and power systems, microgrid operators, and distributed energy resources in regulated zones.
Remote operations where DEF logistics are especially costly, complex, and supply-chain constrained.
H2SCR™ is hydrogen-source agnostic. The four most commercially attractive pathways for stationary applications are below.
Uses natural gas, propane, diesel vapor, or RNG already on site. Lowest cost pathway with proven technology.
Produces the highest purity hydrogen from water and electricity. Zero point-source emissions when powered by renewables.
Very high efficiency electrolysis using waste steam. Ideal where heat is already available on site.
Converts exhaust NOx into the ammonia reagent itself — a fully circular NOx reduction architecture.
Major commercial and emerging pathways by feedstock, purity, CO₂ impact, and commercial readiness.
| Method | Feedstock | H₂ Purity | CO₂ Emissions | Status |
|---|---|---|---|---|
| Steam Methane Reforming (SMR) | Natural Gas | 99.9%+ | High | Commercial |
| SMR + Carbon Capture (Blue H₂) | Natural Gas | 99.9%+ | Medium | Commercial |
| Alkaline Electrolysis | Water | 99.5–99.99% | Grid-dependent | Commercial |
| PEM Electrolysis | Water | 99.99%+ | Near zero* | Commercial |
| Solid Oxide Electrolysis (SOEC) | Steam | 99.9%+ | Near zero* | Emerging |
| Biomass Gasification | Biomass | 95–99.9% | Low to negative | Emerging |
| Biogas Reforming | Biogas / RNG | 99.9%+ | Low | Commercial |
| Methane Pyrolysis | Natural Gas | 99.9%+ | Very low | Emerging |
| Ammonia Cracking | NH₃ | 99.9–99.999% | Low | Growing |
| Coal Gasification | Coal | 99.9%+ | Very high | Declining |
* When powered by renewable electricity.
CMXI.org is the commercialization partner for H2SCR™ and is currently accepting OEM licensing inquiries. Generator, engine, and emissions control manufacturers are invited to discuss integration.
Email Daniel Wells — daniel@cmxi.org